Title of Invention: COMBINATION OF HUMAN ANTI-FGFR4 ANTIBODY AND SORAFENIB Abstract: The present invention relates to the medical use of antibodies against the FGF receptor 4 (FGFR4) combined with Sorafenib, in particular for the prevention or treatment of hyperproliferative diseases associated with FGFR expression, overexpression or hyperactivity. Detailed Description: The present invention relates to the medical use of antibodies against the FGF receptor 4 (FGFR4) combined with Sorafenib for the prevention or treatment of hyperproliferative diseases, in particular cancer. Cancer chemotherapy has been one of the major medical advances in the last decades. However, conventional chemotherapy typically does not discriminate effectively between rapidly dividing normal cells and tumor cells, thus leading to several toxic side effects. In contrast, targeted therapies that have been introduced in recent years are directed against cancer-specific molecules and signaling pathways. Thus, targeted therapies have a high specificity toward tumor cells, providing a broader therapeutic window with less toxicity. Tyrosine kinases are an especially important target because they play an important role in the modulation of growth factor signaling. Fibroblast growth factors (FGFs) are a family of growth factors with diverse biological activities with members involved in angiogenesis, wound healing, embryonic development and various endocrine signaling pathways. The human FGF family comprises 18 members, which are structurally related signaling molecules. They exert their biological activity by interacting with their cognate receptors (FGFRs), a family of receptor tyrosine kinases. The mammalian FGFR family has four members: FGFR1-4, each consisting of three extracellular immunoglobulin-type domains (D1-D3), a single-span transmembrane domain and an intracellular split tyrosine kinase domain. FGFs interact mostly with the D2 and D3 domains. Each FGFR binds to a specific subset of the FGFs. Most FGFs can bind to several different FGFR subtypes whereas others activate specifically one receptor or one isoform of a receptor. The receptor-ligand interactions result in receptor dimerization and autophosphorylation, formation of complexes with membrane-associated and cytosolic accessory proteins, and initiation of multiple signaling cascades. The FGFR-FGF signaling system plays important roles in the development and tissue repair by regulating cellular functions and processes such as growth, differentiation, migration, morphogenesis and angiogenesis. FGFR4 signaling is activated by several FGFs that activate also other members of the FGFR family (Ornitz et al., 1996, J. Biol. Chem., 1996, 271: 15292-7) while FGF19 is specific for FGFR4 (Xie et al., 1999, Cytokine, 11(10):720-35). The activation of the FGFR4 receptor results in several types of cell signaling including the setting-up of a phosphorylation cascade-mediated signaling pathway subsequent to stimulation of FGFR4 by FGF. Upon binding of the ligand to the extracellular domain of FGFR4, receptor dimerization and subsequent phosphorylation of tyrosine kinase residues results in activation of signaling pathways by inducing the binding of signaling molecules to the receptor (Vainikka et al., 1992, EMBO, 11(12):4273-4280, and 1994, J. Biol. Chem. 269:18320-18326). For example, FGFR4 associates with PLCγ1, and an increase in MAP kinase activation and DNA synthesis upon a FGF simulation has been observed. Further interaction with other human FGF growth factor receptor family members may expand the signaling potential of FGFR4 and is a means not only for signal diversification but also signal amplification (McKeehan W L. and Kan M., 1994, Mol. Reprod. Dev. 39:69-82). An 85 kDa serine kinase has been found to negatively regulate tyrosine phosphorylation of FGFR4, but its exact function has not been elucidated (Vainikka et al., 1996, J. Biol. Chem. 271:1270-1273). Association of FGFR4 with NCAM has been demonstrated to mediate integrin-dependent adhesion (Cavallaro et al., 2001, Nat. Cell Biol. 3:650-657), which might play a decisive role in tumor metastasis. FGFR4 has been reported to have several cellular roles. The receptor is involved in the control of various cell differentiation processes in vitro and in vivo such as skeleton muscle differentiation and regeneration, mesenchymal differentiation, or osteogenesis or else in the formation of alveoli during postnatal hepatic development. Further, FGFR4 is described in the control of bile acid and cholesterol homeostasis and is thought to be involved in the control of adiposity. Furthermore, the balance between bile production and cholesterol production is controlled by FGFR4 in vitro and in vivo. FGFR4 is also involved in certain tumor phenomena such as the development of hepatocellular carcinomas or colon cancers, or in the proliferation of mammary fibroadenoma cells or of mammary cancer epithelial cells such as mammary or colorectal carcinoma cell motility. The overexpression of FGFR4 is also described in certain pancreatic cancer lines and correlates with astrocytoma malignancy. The involvement of FGFR4 in various disorders makes the receptor an interesting target for diagnostic and therapeutic applications. In this context, an effective strategy is the usage of antibodies against FGFR4. In particular, antibodies that interfere with FGFR4-mediated signaling are desirable. Examples of FGFR4 antibodies are described in the literature such as in international applications WO 03/063893, WO +1-900-824-4413, WO 2013/0183319 and in US application US 2011/0150903. Bumbaca et al. (mAbs 3:4, 1-11; 2011) describes a humanized anti-FGFR4 antibody that binds with high specificity to FGF receptor 4. Recently, it was found that antibodies directed against an epitope between amino acids 119-284 of human FGFR4 or functional fragments thereof are particularly useful for therapeutic and diagnostic applications. These antibodies are described in international application PCT/EP2015/068440, the disclosure of which is incorporated herein by reference. The described human antibodies were found to be particularly useful for therapeutic and diagnostic applications. They specifically bind to FGFR4 and preferably show no cross-reactivity to other FGF receptors FGFR1-3b, c. Further, the antibodies are capable of inhibiting ligand binding to human FGFR4. The antibodies show advantageous properties with respect to their binding specificity and biological activity, in particular with respect to their capability to decrease cell growth and cell migration, their ability to activate a further antineoplastic agent and/or sensitize tumor cells to a therapeutic treatment. However, there still remains a need for new, effective therapies for treating hyperproliferative diseases, in particular cancer. Sorafenib is a dual-action Raf kinase and VEGFR inhibitor that inhibits tumor cell proliferation and angiogenesis. Although originally developed as a Raf kinase inhibitor, it was subsequently found to inhibit a variety of kinase receptors, including VEGFR, EGFR, and PDGFR kinases (Wilhelm et al. (2004), Cancer Res 64: 7099-7109, Strumberg et al. (2005), J Clin Oncol 23: 965-972). Sorafenib has significant activity in four different tumor types, including renal, colon, pancreatic, lung, and ovarian tumors. In the present invention it was surprisingly found, that a combination of certain anti-FGFR4 antibodies and Sorafenib represents a new and promising approach to cancer therapy. The combination treatment provides additive or even synergistic anticancer activity, thus leading to beneficial clinical effects. Thus, a first aspect of the present invention is a combination of (i) a human anti-FGFR4 antibody or a functional fragment of said antibody and (ii) Sorafenib or a pharmaceutically acceptable salt thereof, for use in the prevention and/or treatment of a hyperproliferative disease associated with FGFR4 expression, overexpression and/or hyperactivity, wherein the human anti-FGFR4 antibody or the functional fragment of said antibody is directed against an epitope between amino acids 119-248, preferably between amino acids 152-240, more preferably between amino acids 230 and 240 of human FGFR4. In terms of the present invention, the term “antibody” particularly refers to molecules comprising at least one immunoglobulin heavy chain and at least one immunoglobulin light chain. Each heavy and light chain may comprise a variable and a constant domain. The antigen binding site may be formed from the variable domains of a heavy and light chain. A variable region (also referred to as variable domain) comprises complementarity determining regions (CDRs), e.g. a CDR1, a CDR2 and a CDR3 region and framework regions (FRs) flanking the CDRs. The term “complementarity determining region” is readily understood by the skilled person (see for example Harlow and Lane (eds.), Antibodies: A Laboratory Manual, CSHL press, Cold Spring Harbor, N.Y., 1988) and refers to the stretches of amino acids within the variable domain of an antibody that primarily make contact with the antigen and determined antibody specificity. This region is also known as the hypervariable region. The term “human antibody” encompasses fully human or humanized antibodies, wherein fully human antibodies are preferred. Human antibodies may be prepared from genetically engineered animals, e.g. animals comprising a xenogenic immune system or from antibody display libraries according to known techniques. Human antibodies are described generally in van Dijk and van de Winkel (Curr. Opin. Pharmacol. 5: 368-74 (2001)) and Lonberg (Curr. Opin. Immunol. 20: 450-459 (2008)). Human antibodies may be prepared by administering an immunogen to a transgenic animal that has been modified to produce intact human antibodies or intact antibodies with human variable regions in response to antigenic challenge. Such animals typically contain all or a portion of the human immunoglobulin loci, which replace the endogenous immunoglobulin loci, or which are present extrachromosomally or integrated randomly into the animal's chromosomes. In such transgenic mice, the endogenous immunoglobulin loci have generally been inactivated. For review of methods for obtaining human antibodies from transgenic animals, see for example Lonberg, Nat. Biotech. 23: 1117-1125 (2005). Human variable regions from intact antibodies generated by such animals may be further modified, e.g. by combining with a different human constant region. Human antibodies can also be made by hybridoma-based methods. Human myeloma and mouse-human heteromyeloma cell lines for the production of human monoclonal antibodies have been described (see e.g. Kozbor J. Immunol. 133: 3001 (1984); Brodeur et al., Monoclonal Antibody Production Techniques and Applications, pp. 51-63). Human antibodies generated via human B-cell hybridoma technology are also described in Li et al, Proc. Natl. Acad. Sci., USA 103: 3557-3562 (2006). Human antibodies may also be generated by phage display methods (see e.g., U.S. Pat. No. 6,248,516, U.S. Pat. No. 5,403,484, U.S. Pat. No. 5,969,108, U.S. Pat. No. 5,885,793, U.S. Pat. No. 6,696,248, U.S. Pat. No. 5,849,500). Techniques for selecting human antibodies from antibody libraries are known in the art. (see e.g., Carmen, S. et al., Briefings in Functional Genomics and Proteomics (2002), 1 (2), p. 189-203; and Siriwardena, D. et al., Ophthalmology (2002) 109 (3), p. 427-431). For example, a phage display method can be used, which involves causing human antibody variable regions to be expressed as a single-chain antibody (scFv) on phage surface and selecting phages binding to antigens (Nature (1991), 352, (6336), p. 624-628, Journal of Molecular Biology (1992), 227, (2), p 381-388, and Nature Biotechnology (2005), 23, (9), p. 1105-1116). Likewise, another phage display method can also be used, which involves causing human antibody Fab (antigen-binding fragment) to be expressed on the surface of phage and selecting phages binding to antigens (WO 97/08320 and WO 01/05950). Genes of the phages selected based on antigen binding can be analyzed to thereby determine DNA sequences encoding human antibody variable regions binding to the antigens. When the DNA sequence of scFv or Fab binding to the antigens is clarified, CDR sequences are extracted therefrom, and expression vectors having the sequences can be prepared and introduced into appropriate hosts, followed by gene expression to obtain human antibodies (WO 92/01047, WO 92/20791, WO 93/06213, WO 93/11236, WO 93/19172, WO 95/01438, WO 95/15388, Annu. Rev. Immunol (1994) 12, p. 433-455, and Nature Biotechnology (2005) 23 (9), p. 1105-1116). Human antibodies may also be generated by isolating Fv clone variable domain sequences selected from human-derived phage display libraries. Such variable domain sequences may then be combined with a desired human constant domain. Techniques for selecting human antibodies from antibody libraries are known in the art. Humanized antibodies may be prepared by humanization of monoclonal antibodies according to known techniques. Typically, a non-human antibody is humanized to reduce immunogenicity to humans, while retaining the specificity and affinity of the parental non-human antibody. Humanized antibodies and methods of making them are reviewed, e.g. in Alamagro and Fransson, Front. Biosci. 13: 1619-1633 (2008). The invention also encompasses functional fragments of human antibodies, e.g. portions of the above-mentioned antibodies which comprise at least one antigen binding site. The term “functional fragment” as used herein is used with the same meaning as “antigen binding fragment”. Examples of antibody functional fragments include Fab fragments, Fab′ fragments, F(ab′)2 fragments, Fv fragments, diabodies or single chain antibody molecules and other fragments as long as they exhibit the desired capability of binding to human FGFR4. For a review of certain antibody fragments see Hudson et al., Nat. Met. 9: 129-134 (2003). Diabodies are antibody fragments with two antigen binding sites that may be bivalent or bispecific. See for example Hudson et al., (2003). Single-chain antibodies are antibody fragments comprising all or a portion of the heavy chain variable domain or all, or a portion of the light chain variable domain of an antibody. Antibody fragments can be made by various techniques including but not limited to proteolytic digestion of an intact antibody as well as production by recombinant hosts (e.g. E. coli or phage) as described herein. In certain embodiments, an antibody for the use provided herein is a multispecific antibody, e.g. a bispecific antibody. Multispecific antibodies are monoclonal antibodies that have binding specificities for at least two different sites. In certain embodiments, one of the binding specificities is for FGFR4 and the other is for any other antigen. In certain embodiments, bispecific antibodies may bind to two different epitopes of FGFR4. Bispecific antibodies may also be used to localize cytotoxic agents to cells which express FGFR4. Bispecific antibodies can be prepared as full-length antibodies or antibody fragments. Techniques for making multispecific antibodies include but are not limited to recombinant co-expression of two immunoglobulin heavy chain-light chain pairs having different specificities and “knob in hole” engineering. Multispecific antibodies may also be made by engineering electrostatic steering effects for making antibody Fc-heterodimeric molecules; crosslinking two or more antibodies or fragments; using leucine zippers to produce bispecific antibodies; using “diabody” technology for making bispecific antibodies and using single-chain Fv and preparing trispecific antibodies as described. Engineered antibodies with three or more functional antigen binding sites including “octopus antibodies” are also included herein. In certain embodiments, amino acid sequence variants of the antibodies provided herein are contemplated as long as they exhibit the desired capability of binding to human FGFR4. For example, it may be desirable to improve the binding affinity and/or other biological properties of the antibody. Amino acid sequence variants of an antibody may be prepared by introducing appropriate modifications into the nucleotide sequence encoding the antibody, or by peptide synthesis. Such modifications include, for example, deletions from and/or insertions into and/or substitutions of residues within the amino acid sequences of the antibody. Any combination of deletion, insertion and substitution can be made to arrive at the final construct, provided that the final construct possesses the desired characteristics, e.g. antigen binding. The number of amino acid residues to be deleted, inserted into, and/or substituted is generally 10 or less, preferably 5 or fewer, more preferably 3 or fewer, and most preferably 1 or 2. The term “bind” or “binding” of an antibody means an at least temporary interaction or association with or to a target antigen, i.e. human FGFR4 comprising fragments thereof containing an epitope. In certain embodiments, an antibody for the use provided herein has a dissociation constant (Kd) of ≤1 μM, ≤100 nM, ≤10 nM, ≤1 nM, ≤0.1 nM, 0.01 nM, or ≤0.001 nM (e.g. 10−8 M or less, e.g. from 10−8 M to 10−13 M, e.g. 10−9 M to 1013M). In one embodiment, Kd is measured by a radio-labeled antigen binding assay (Radioimmunoassay, RIA) performed with the Fab version of an antibody of interest and its antigen. According to another embodiment, Kd is measured using surface plasmon resonance assays with immobilized antigen. According to a preferred embodiment of the present invention, the antibodies are human monoclonal antibodies directed against an epitope of human FGFR4 as described herein. The antibodies or functional fragments thereof for the use of the present invention are directed against an epitope between amino acids 119-284 of human FGFR4. The epitope is preferably located in the Ig-like domain 2 of human FGFR4. The antibodies are described in more detail in international application PCT/EP2015/068440, the disclosure of which is incorporated herein by reference. Particularly preferred are human antibodies directed against an epitope between amino acids 152-240 and more preferably between amino acids 230 and 240 of human FGFR4. The epitope can be a conformational or a sequential epitope. Preferably, the antibodies for use according to the invention bind to a sequential epitope between amino acids 152-240 and more preferably between amino acids 230 and 240 of human FGFR4. According to a particularly preferred embodiment, the antibody for the use of the invention is directed against an epitope, preferably a sequential epitope, comprising, essentially consisting of or consisting of the amino acid sequence RYNY. The antibodies for the use of the invention may be of various immunoglobulin (Ig) types, for example of the IgA-, IgD-, IgE-, IgG- or IgM-type, preferably of the IgG- or IgM-type including but not limited to the IgG1-, IgG2-, IgG3-, IgG4-, IgM1 and IgM2-type. In one preferred embodiment the antibody is of the IgG1-type. In certain embodiments of the present invention, the antibody may comprise specific heavy chain complementarity determining regions CDRH1, CDRH2 and/or CDRH3 as described herein below. In one embodiment, the human antibody comprises a heavy chain complementarity determining region 1 (CDRH1) having the amino acid sequence as shown in any one of SEQ ID NOs: 1-6, or an amino acid sequence differing in 1 or 2 amino acids therefrom. In a further embodiment, the antibody comprises a heavy chain complementarity determining region 2 (CDRH2) having the amino acid sequence as shown in any one of SEQ ID NOs: 7-12, or an amino acid sequence differing in 1 or 2 amino acids therefrom. In yet a further embodiment, the antibody comprises a heavy chain complementarity determining region 3 (CDRH3) having the amino acid sequence as shown in any one of SEQ ID NOs: 13-20, or an amino acid sequence differing in 1 or 2 amino acids therefrom. The antibody according to the invention may also comprise specific light chain complementarity determining regions CDRL1, CDRL2 and/or CDRL3. Accordingly, in one embodiment, the antibody comprises a light chain complementarity determining region 1 (CDRL1) having the amino acid sequence as shown in any one of SEQ ID NOs: 21-23 and 68, or an amino acid sequence differing in 1 or 2 amino acids therefrom. In a further embodiment, the antibody comprises a light chain complementarity determining region 2 (CDRL2) having the amino acid sequence as shown in any one of SEQ ID NOs: 24-27, or an amino acid sequence differing in 1 or 2 amino acids therefrom. In yet a further embodiment, the antibody comprises a light chain complementarity determining region 3 (CDRL3) having the amino acid sequence as shown in any one of SEQ ID NOs: 28-35, or an amino acid sequence differing in 1 or 2 amino acids therefrom. The antibody may preferably comprise a specific combination of CDRs (i.e. of CDRH1, CDRH2 and CDRH3) within one heavy chain. Accordingly, in one preferred embodiment, the antibody comprises a heavy chain comprising complementarity determining regions CDRH1, CDRH2 and CDRH3, wherein CDRH1 is selected from the sequences as shown in SEQ ID NOs: 1-6, or an amino acid sequence differing in 1 or 2 amino acids therefrom, CDRH2 is selected from the sequences shown in SEQ ID NOs: 7-12, or an amino acid sequence differing in 1 or 2 amino acids therefrom, and CDRH3 is selected from the sequences shown in SEQ ID NOs: 13-20, or an amino acid sequence differing in 1 or 2 amino acids therefrom. Most preferably, the antibody for the use of the invention comprises a heavy chain comprising three CDRs, wherein the combination of CDRH1, CDRH2 and CDRH3 is selected from those shown in table 1. It is understood that each line of this table represents one specific combination of a CDRH1, a CDRH2 and a CDRH3. TABLE 1 CDRH1 CDRH2 CDRH3 RNYMS AISGSGGSTYYADSVKG VTSPGAFDI (SEQ ID NO. 1) (SEQ ID NO. 7) (SEQ ID NO. 13) KAWMS AISGSGGSTYYADSVKG LYSYGDFDH (SEQ ID NO. 2) (SEQ ID NO. 7) (SEQ ID NO. 14) DYYMS TISGSGGSTYYADSVKG LTAYGHVDS (SEQ ID NO. 3) (SEQ ID NO. 8) (SEQ ID NO. 15) SNYMS LISGSGGSTYYADSVQG NTAGFGYFDL (SEQ ID NO. 4) (SEQ ID NO. 9) (SEQ ID NO. 16) SNYMN VISYDGSNKYYADSVKG KSRDFWRGPFDY (SEQ ID NO. 5) (SEQ ID NO. 10) (SEQ ID NO. 17) SNYMS SISGSGGRTYYADSVKG MTVFGAATL (SEQ ID NO. 4) (SEQ ID NO. 11) (SEQ ID NO. 18) DYYMN AIGGSGDRTYYADSVKG GGSYFGY (SEQ ID NO. 6) (SEQ ID NO. 12) (SEQ ID NO. 19) DYYMS AISGSGGSTYYADSVKG LATYGPFDD (SEQ ID NO. 3) (SEQ ID NO. 7) (SEQ ID NO. 20) According to the present invention, it is further preferred that the antibody comprises a specific combination of CDRs within one light chain (i.e. of CDRL1, CDRL2 and CDRL3). Thus, in one preferred embodiment, the antibody comprises a light chain comprising complementarity determining regions CDRL1, CDRL2 and CDRL3, wherein CDRL1 has the amino acid sequence as shown in any of SEQ ID NOs: 21-23 and 68, or an amino acid sequence differing in 1 or 2 amino acids therefrom, CDRL2 has the amino acid sequence as shown in any of SEQ ID NOs: 24-27, or an amino acid sequence differing in 1 or 2 amino acids therefrom, and CDRL3 has the amino acid sequence as shown in any of SEQ ID NOs: 28-35, or an amino acid sequence differing in 1 or 2 amino acids therefrom. Most preferably, the antibody for the use of the invention comprises a light chain comprising three CDRs, wherein the combination of CDRL1, CDRL2 and CDRL3 is selected from those shown in table 2. It is understood that each line of this table represents one specific combination of a CDRL1, a CDRL2 and a CDRL3. TABLE 2 CDRL1 CDRL2 CDRL3 SGGTSNIGTNTVN RNNQRPS AAWDDSLNGPYVV (SEQ ID NO. 21) (SEQ ID NO. 24) (SEQ ID NO. 28) SGSSSNIGSNTVN RNNQRPS AAWDDSLNGPAVV (SEQ ID NO. 22) (SEQ ID NO. 24) (SEQ ID NO. 29) SGSSSNIGTNTVN RNYQRPS AAWDDSLSGPHVV (SEQ ID NO. 23) (SEQ ID NO. 25) (SEQ ID NO. 30) SGSSSNIGSNTVN RNNQRPS AAWDDSLNGPLVV (SEQ ID NO. 22) (SEQ ID NO. 24) (SEQ ID NO. 31) SGSSSNIGSNTVN RNNQRPS STWDDSLRGWV (SEQ ID NO. 22) (SEQ ID NO. 24) (SEQ ID NO. 32) SGSSSNIGSNTVN RNNQRPS AAWDDSLNGPYWV (SEQ ID NO. 22) (SEQ ID NO. 24) (SEQ ID NO. 33) SGSSSNIGSNTVN YDDLLPS AAWDDSLNGPV (SEQ ID NO. 22) (SEQ ID NO. 26) (SEQ ID NO. 34) SGSSSNIGSNTVH RNNRRPS AAWDDSLSGPNVV (SEQ ID NO. 68) (SEQ ID NO. 27) (SEQ ID NO. 35) As described above, the complementarity determining regions (CDRs) of an antibody may be flanked by framework regions. A heavy or light chain of an antibody containing three CDRs contains e.g. four framework regions. Additionally, the present invention also encompasses those antibodies that recognize the same epitope on human FGFR4 as a specific antibody characterized by the above heavy and/or light chain CDRs. Functional fragments of those antibodies are also within the scope of the invention. To determine the epitope on FGFR4 recognized by the antibody, chemically prepared arrays of protein sequence derived short peptides derived from the amino acid sequence of the extracellular domain of human FGFR4 can be used to locate and identify antibody epitopes (Reinicke W., Methods Mol. Biol. 2004, 248: 443-63). A further method to map the epitopes in the FGFR4 extracellular domain bound by the antibodies of the invention comprises Snaps/SELDI (Wang et al., int. J. Cancer, 2001, Jun. 15; 92 (6): 871-6) or a routine cross-blocking assay such as described in Antibodies, A Laboratory Manual, Cold Spring Harbor Laboratory, Ed Harlow and David Lane (1988) can be performed. According to a particularly preferred embodiment, the human antibody for use of the invention comprises a heavy chain comprising at least one CDR selected from the group consisting of (a) a CDRH1 as shown in SEQ ID NO: 1-6, or a CDRH1 sequence differing in 1 or 2 amino acids therefrom, (b) a CDRH2 as shown in SEQ ID NO: 7-12, or a CDRH2 sequence differing in 1 or 2 amino acids therefrom, and (c) a CDRH3 as shown in SEQ ID NO: 13-20, or a CDRH3 sequence differing in 1 or 2 amino acids therefrom, and/or a light chain comprising at least one CDR selected from the group consisting of (d) a CDRL1 as shown in SEQ ID NO: 21-23 or 68, or a CDRL1 sequence differing in 1 or 2 amino acids therefrom, (e) a CDRL2 as shown in SEQ ID NO: 24-27, or a CDRL2 sequence differing in 1 or 2 amino acids therefrom, and (f) a CDRL3 as shown in SEQ ID NO: 28-35, or a CDRL3 sequence differing in 1 or 2 amino acids therefrom. In a preferred embodiment of the invention, the human antibody comprises a heavy chain variable region (VH) as shown in any one of SEQ ID NOs. 52-59 or a sequence differing in 1 or 2 amino acids therefrom. Furthermore, the human antibody of the invention preferably comprises a light chain variable region (VL) as shown in any one of SEQ ID NOs. 60-67 or a sequence differing in 1 or 2 amino acids therefrom. Particularly preferred are human antibodies comprising a heavy chain variable region as shown in any one of SEQ ID NOs. 52-59 and a light chain variable region as shown in in any one of SEQ ID NOs. 60-67. Particularly preferred is a human antibody (U4-1) comprising a heavy chain comprising a CDRH1 as shown in SEQ ID NO: 1, a CDRH2 as shown in SEQ ID NO: 7 and a CDRH3 as shown in SEQ ID NO: 13 and a light chain comprising a CDRL1 as shown in SEQ ID NO: 21, a CDRL2 as shown in SEQ ID NO: 24 and a CDRL3 as shown in SEQ ID NO: 28. Also encompassed are human antibodies, wherein one or more of the CDRs differ in 1 or 2 amino acids or antibodies recognizing the same epitope on human FGFR4. In a particularly preferred embodiment, the human antibody comprises a heavy chain variable region according to SEQ ID NO: 52 and a light chain variable region according to SEQ ID NO: 60. Also encompassed are human antibodies wherein the sequences of the variable region of the heavy chain and/or the light chain differ in 1 or 2 amino acids from those shown in SEQ ID NOs. 52 and 60. Particularly preferred is a human antibody (U4-2) comprising a heavy chain comprising a CDRH1 as shown in SEQ ID NO: 2, a CDRH2 as shown in SEQ ID NO: 7 and a CDRH3 as shown in SEQ ID NO: 14 and a light chain comprising a CDRL1 as shown in SEQ ID NO: 22, a CDRL2 as shown in SEQ ID NO: 24 and a CDRL3 as shown in SEQ ID NO: 29. Also encompassed are human antibodies, wherein one or more of the CDRs differ in 1 or 2 amino acids or antibodies recognizing the same epitope on human FGFR4. In a particularly preferred embodiment, the human antibody comprises a heavy chain variable region according to SEQ ID NO: 53 and a light chain variable region according to SEQ ID NO: 61. Also encompassed are human antibodies wherein the sequences of the variable region of the heavy chain and/or the light chain differ in 1 or 2 amino acids from those shown in SEQ ID NOs. 53 and 61. Particularly preferred is a human antibody (U4-3) comprising a heavy chain comprising a CDRH1 as shown in SEQ ID NO: 3, a CDRH2 as shown in SEQ ID NO: 8 and a CDRH3 as shown in SEQ ID NO: 15 and a light chain comprising a CDRL1 as shown in SEQ ID NO: 23, a CDRL2 as shown in SEQ ID NO: 25 and a CDRL3 as shown in SEQ ID NO: 30. Also encompassed are human antibodies, wherein one or more of the CDRs differ in 1 or 2 amino acids or antibodies recognizing the same epitope on human FGFR4. In a particularly preferred embodiment, the human antibody comprises a heavy chain variable region according to SEQ ID NO: 54 and a light chain variable region according to SEQ ID NO: 62. Also encompassed are human antibodies wherein the sequences of the variable region of the heavy chain and/or the light chain differ in 1 or 2 amino acids from those shown in SEQ ID NOs. 54 and 62. Particularly preferred is a human antibody (U4-4) comprising a heavy chain comprising a CDRH1 as shown in SEQ ID NO: 4, a CDRH2 as shown in SEQ ID NO: 9 and a CDRH3 as shown in SEQ ID NO: 16 and a light chain comprising a CDRL1 as shown in SEQ ID NO: 22, a CDRL2 as shown in SEQ ID NO: 24 and a CDRL3 as shown in SEQ ID NO: 31. Also encompassed are human antibodies, wherein one or more of the CDRs differ in 1 or 2 amino acids or antibodies recognizing the same epitope on human FGFR4. In a particularly preferred embodiment, the human antibody comprises a heavy chain variable region according to SEQ ID NO: 55 and a light chain variable region according to SEQ ID NO: 63. Also encompassed are human antibodies wherein the sequences of the variable region of the heavy chain and/or the light chain differ in 1 or 2 amino acids from those shown in SEQ ID NOs. 55 and 63. Particularly preferred is a human antibody (U4-5) comprising a heavy chain comprising a CDRH1 as shown in SEQ ID NO: 5, a CDRH2 as shown in SEQ ID NO: 10 and a CDRH3 as shown in SEQ ID NO: 17 and a light chain comprising a CDRL1 as shown in SEQ ID NO: 22, a CDRL2 as shown in SEQ ID NO: 24 and a CDRL3 as shown in SEQ ID NO: 32. Also encompassed are human antibodies, wherein one or more of the CDRs differ in 1 or 2 amino acids or antibodies recognizing the same epitope on human FGFR4. In a particularly preferred embodiment, the human antibody comprises a heavy chain variable region according to SEQ ID NO: 56 and a light chain variable region according to SEQ ID NO: 64. Also encompassed are human antibodies wherein the sequences of the variable region of the heavy chain and/or the light chain differ in 1 or 2 amino acids from those shown in SEQ ID NOs. 56 and 64. Particularly preferred is a human antibody (U4-6) comprising a heavy chain comprising a CDRH1 as shown in SEQ ID NO:6, a CDRH2 as shown in SEQ ID NO: 12 and a CDRH3 as shown in SEQ ID NO: 19 and a light chain comprising a CDRL1 as shown in SEQ ID NO: 22, a CDRL2 as shown in SEQ ID NO: 26 and a CDRL3 as shown in SEQ ID NO: 34. Also encompassed are human antibodies, wherein one or more of the CDRs differ in 1 or 2 amino acids or antibodies recognizing the same epitope on human FGFR4. In a particularly preferred embodiment, the human antibody comprises a heavy chain variable region according to SEQ ID NO: 58 and a light chain variable region according to SEQ ID NO: 66. Also encompassed are human antibodies wherein the sequences of the variable region of the heavy chain and/or the light chain differ in 1 or 2 amino acids from those shown in SEQ ID NOs. 58 and 66. Particularly preferred is a human antibody (U4-7) comprising a heavy chain comprising a CDRH1 as shown in SEQ ID NO: 3, a CDRH2 as shown in SEQ ID NO: 7 and a CDRH3 as shown in SEQ ID NO: 20 and a light chain comprising a CDRL1 as shown in SEQ ID NO: 68, a CDRL2 as shown in SEQ ID NO: 27 and a CDRL3 as shown in SEQ ID NO: 35. Also encompassed are human antibodies, wherein one or more of the CDRs differ in 1 or 2 amino acids or antibodies recognizing the same epitope on human FGFR4. In a particularly preferred embodiment, the human antibody comprises a heavy chain variable region according to SEQ ID NO: 59 and a light chain variable region according to SEQ ID NO: 67. Also encompassed are human antibodies wherein the sequences of the variable region of the heavy chain and/or the light chain differ in 1 or 2 amino acids from those shown in SEQ ID NOs. 59 and 67. Particularly preferred is a human antibody (U4-8) comprising a heavy chain comprising a CDRH1 as shown in SEQ ID NO: 4, a CDRH2 as shown in SEQ ID NO: 11 and a CDRH3 as shown in SEQ ID NO: 18 and a light chain comprising a CDRL1 as shown in SEQ ID NO: 22, a CDRL2 as shown in SEQ ID NO: 24 and a CDRL3 as shown in SEQ ID NO: 33. Also encompassed are human antibodies, wherein one or more of the CDRs differ in 1 or 2 amino acids or antibodies recognizing the same epitope on human FGFR4. In a particularly preferred embodiment, the human antibody comprises a heavy chain variable region according to SEQ ID NO: 57 and a light chain variable region according to SEQ ID NO: 65. Also encompassed are human antibodies wherein the sequences of the variable region of the heavy chain and/or the light chain differ in 1 or 2 amino acids from those shown in SEQ ID NOs. 57 and 65. Also preferred is a human antibody (U4-9) comprising a heavy chain comprising a CDR1 as shown in SEQ ID NO: 3, a CDRH2 as shown in SEQ ID NO: 8 and a CDRH3 as shown in SEQ ID NO: 15 and a light chain comprising a CDRL1 as shown in SEQ ID NO: 68, a CDRL2 as shown in SEQ ID NO: 27 and a CDRL3 as shown in SEQ ID NO: 35. Also encompassed are human antibodies, wherein one or more of the CDRs differ in one or two amino acids or antibodies recognizing the same epitope on human FGFR4. In a particularly preferred embodiment the human antibody comprises a heavy chain variable region according to SEQ ID NO: 54 and a light chain variable region according to SEQ ID NO: 67. The antibody U4-9 preferably comprises the heavy chain as specified for antibody U4-3 and the light chain as specified for antibody U4-7. In the experiments provided in the application PCT/EP2015/068440, the antibody U4-9 proved to have a higher affinity for FGFR4 than U4-3. In certain embodiments, the antibodies or functional fragments thereof for the use of the present invention include an antibody or a functional fragment thereof, having substantial identity with a variable region of U4-1, U4-2, U4-3, U4-4, U4-5, U4-6, U4-7, U4-8 or U4-9 heavy chain or light chain variable region. The term “substantial identity” means that two amino acid sequences share at least 80% sequence identity, preferably at least 90%, more preferably at least 95% sequence identity, and most preferably at least 99% sequence identity. The identity between two amino acid sequences can be determined using Blast algorithm version 2.2.2 (Altschul, Stephen F., Thomas L. Madden, Alejandro A. Schaffer, Jinghui Zhang, Zheng Zhang, Webb Miller, and David J. Lipman (1997), “Gapped BLAST and PSI-BLAST: a new generation of protein database search programs”, Nucleic Acids Res. 25: 3389-3402) with default parameters. The Blast algorithm can also be used through the Internet by accessing the site www.ncbi.nlm.nih.gov/blast. In certain embodiments, the antibodies or functional fragments thereof for the use of the present invention include an antibody or a functional fragment thereof that competes with U4-1, U4-2, U4-3, U4-4, U4-5, U4-6, U4-7, U4-8 or U4-9 for the binding to FGFR4. The antibodies for the use of the present invention can for example be obtained from nucleic acid molecules comprising nucleic acid sequences as shown in any one of SEQ ID NOs: 36-43 and SEQ ID NOs. 44-51 as described in more detail in co-pending application PCT/EP2015/068440. As mentioned above, the human anti-FGFR4 antibodies show advantageous properties with respect to their binding specificity and biological activity, in particular with respect to their capability to recognize epitopes of the human FGFR4, to decrease cell growth and cell migration, their ability to activate a further antineoplastic agent and/or sensitize tumor cells to a therapeutic treatment. The antibodies of the invention U4-1 to U4-9 have intrinsic antitumor activity. They specifically bind to FGFR4 and preferably show no cross-reactivity to other FGF receptors FGFR1-3b, c. The antibody for use of the present invention may be coupled to a heterologous group, e.g. an effector group. Such an antibody conjugate is especially suitable for therapeutic applications. The term “effector group” may refer to a cytotoxic group, such as a radioisotope or a radionuclide, a toxin, a therapeutic group or another effector group known in the art. Conjugates wherein the antibody is coupled to a therapeutic group, so-called antibody-drug-conjugates (ADCs) are particularly preferred. Alternatively, the antibody may be coupled to a labeling group. Such an antibody conjugate is particularly suitable for diagnostic applications. As used herein, the term “labeling group” refers to a detectable marker, e.g. a radiolabeled amino acid or biotin moiety, a fluorescent marker, an enzyme or any other type of marker which is known in the art. The linking of antibodies or antibody fragments to radioisotopes e.g. provides advantages to tumor treatments. Unlike chemotherapy and other forms of cancer treatment, radioimmunotherapy or the administration of a radioisotope-antibody combination targets the cancer cells with minimal damage to surrounding normal healthy tissue. A further embodiment of the present invention is a combination for the use as defined above, wherein the antibody is fused to interleukin-2 (IL-2). Interleukin-2 is a 15 kDa cytokine produced by T helper cells that stimulates cytotoxic T lymphocytes and NK cells. IL-2 has been used clinically in the treatment of melanoma and renal cell carcinoma to stimulate cancer patient's immune systems. Achieving a prolonged high dose of IL-2 in the tumor can result in the induction of a long-lasting anti-tumor response leading to the rejection of an otherwise lethal tumor. In the present invention it has been found that it is possible to incorporate IL-2 into a fusion protein including an antibody as described herein above while maintaining its activity. Hence, a fusion protein wherein an antibody is fused to IL-2 is suitable to serve as a delivery system which retains antigen binding specificity and possesses the full activity of IL-2. According to the present invention, the above defined antibodies are used in combination with Sorafenib or a pharmaceutically acceptable salt thereof. The term “Sorafenib” refers to the small molecular inhibitor 4-[4-[[4-chloro-3-(trifluoromethyl)phenyl]carbamoylamino]phenoxy]-N-methyl-pyridine-2-carboxamide. Sorafenib and the preparation thereof are described inter alia in WO 00/42012 and WO 03/068228. It is understood that pharmaceutically acceptable salts of Sorafenib as well as commonly used prodrugs are also within the scope of the invention. Pharmaceutically acceptable salts of Sorafenib are for example organic or inorganic acid addition salts. Suitable inorganic acids include but are not limited to halogen acids (such as hydrochloric acid and hydrobromic acid), sulfuric acid, or phosphoric acid. Suitable organic acids include but are not limited to carboxylic, phosphonic, sulfonic, or sulfamic acids, with examples including acetic acid, propionic acid, octanoic acid, decanoic acid, trifluoroacetic acid, dodecanoic acid, glycolic acid, lactic acid, 2- or 3-hydroxybutyric acid, y-aminobutyric acid (GABA), gluconic acid, glucosemonocarboxylic acid, benzoic acid, salicylic acid, phenylacetic acid and mandelic acid, fumaric acid, succinic acid, adipic acid, pimelic acid, suberic acid, azeiaic acid, malic acid, tartaric acid, citric acid, glucaric acid, galactaric acid, amino acids (such as glutamic acid, aspartic acid, N-methylglycine, acetytaminoacetic acid, N-acetylasparagine or N-acetylcysteine), pyruvic acid, acetoacetic acid, methanesulfonic acid, tri-fluoromethane sulfonic acid, 4-toluene sulfonic acid, benzenesulfonic acid, 1-naphthalenesulfonic acid, 2-naphthalenesulfonic acid, phosphoserine, and 2- or 3-glycerophosphoric acid. In addition, pharmaceutically acceptable salts include acid salts of inorganic bases, such as salts containing alkaline cations (e. g., Li+ Na+ or K+), alkaline earth cations (e. g., Mg+2, Ca+2 or Ba+2), the ammonium cation, as well as acid salts of organic bases, including aliphatic and aromatic substituted ammonium, and quaternary ammonium cations, such as those arising from protonation or peralkylation of triethylamine, N, N-diethylamine, N, N-dicyclohexylamine, lysine, pyridine, N, N-dimethylaminopyridine (DMAP), 1, 4-diazabiclo [2.2. 2] octane (DABCO), 1,5-diazabicyclo [4. 3.0] non-5-ene (DBN) and 1, 8-diazabicyclo [5.4. 0] undec-7-ene (DBU). The formation of prodrugs is well known in the art in order to enhance the properties of the parent compound; such properties include solubility, absorption, biostability and release time (see “Pharmaceutical Dosage Form and Drug Delivery Systems” (Sixth Edition), edited by Ansel et al., published by Williams & Wilkins, pages 27-29, (1995) which is hereby incorporated by reference). Commonly used prodrugs of Sorafenib are designed to take advantage of the major drug biotransformation reactions and are also to be considered within the scope of the invention. Major drug biotransformation reactions include N-dealkylation, O-dealkylation, aliphatic hydroxylation, aromatic hydroxylation, N-oxidation, S-oxidation, deamination, hydrolysis reactions, glucuronidation, sulfation and acetylation (see Goodman and Gilman's The Pharmacological Basis of Therapeutics (Ninth Edition), editor Molinoff et al., pub. by McGraw-Hill, pages 11-13, (1996), which is hereby incorporated by reference). In a preferred embodiment, a tosylate salt of Sorafenib is used. The scaleable synthesis of Sorafenib and its tosylate salt is disclosed in Organic Process Research and Development (2002), Vol. 6, Issue #6, 777-781, and WO 03/068228, which is incorporated herein by reference. The usefulness of a combination of an anti-FGFR4 antibody as defined above with Sorafenib or a pharmaceutically acceptable salt thereof is better than could have been expected from conventional knowledge of the effects of using either agent alone. For example, the combination therapy of the antibody U4-3 with Sorafenib has produced at least additive anti-tumor efficacy compared with that produced by administration of either the antibody or Sorafenib administered alone. Generally, the use of the above defined anti-FGFR4 antibodies in combination with the raf kinase inhibitor Sorafenib will serve to yield better efficacy in reducing the growth of a tumor or even eliminate the tumor as compared to administration of a single agent, provide for the administration of lesser amounts of the administered agents, provide for a chemotherapeutic treatment that is well tolerated in the patient with less deleterious pharmacological complications resulting from larger doses of single chemotherapies and certain other combined therapies, provide for treating a broader spectrum of different cancer types in mammals, especially humans, provide for a higher response rate among treated patients, provide for a longer survival time among treated patients compared to standard chemotherapy treatments, provide a longer time for tumor progression, and/or yield efficacy and tolerability results at least as good as those of the agents used alone, compared to known instances where other cancer agent combinations produce antagonist effects. According to the invention, the combination of (i) a human anti-FGFR4 antibody or a functional fragment of said antibody and (ii) Sorafenib or a pharmaceutically acceptable salt thereof is used in the prevention and/or treatment of hyperproliferative diseases associated with FGFR4 expression, overexpression and/or hyperactivity. In particular, the combination of the invention is for use in treating cancer including but not limited to colon cancer, colorectal carcinoma, prostate cancer, leukemia, melanoma, hepatocellular carcinoma (HCC), renal cell carcinoma (RCC), head and neck cancer, glioma, lung cancer, pancreatic cancer, ovarian cancer, and mammary carcinoma. Examples for diseases that can be prevented and/or treated using an antibody of the invention are detailed below. For the combination according to the present invention, the human anti-FGFR4 antibody and/or Sorafenib can be provided as a common pharmaceutical preparation or, more preferred, as separate pharmaceutical preparations, each optionally including a pharmaceutically acceptable carrier. The term “carrier” includes agents, e.g. diluents, stabilizers, adjuvants or other types of excipients that are non-toxic to the cell or mammal to be exposed thereto at the dosages and concentrations employed. Examples of pharmaceutically acceptable carriers are well-known in the art and include phosphate-buffered saline solutions, water, emulsions such as oil/water emulsions, various types of wetting agents, sterile solutions, etc. Often, the pharmaceutically acceptable carrier is an aqueous pH-buffered solution which is useful for drug delivery, particularly for the delivery of antibody molecules. The pharmaceutical compositions may be formulated by well-known conventional methods, i.e. by mixing the active agent with carriers and optionally other agents that are usually incorporated into the formulation. For example, the composition may be formulated in the form of lyophilized formulations, aqueous solutions, dispersions or solid preparations. Administration of the suitable compositions may be effected by different ways, e.g. by intravenous, intraperitoneal, subcutaneous, intramuscular, topical, intradermal, intranasal or intrabronchial administration. The compositions may also be administered directly to the target site, e.g. by biolistic delivery to an external or internal target site, like the brain. The dosage regimen will be determined by the attending physician and clinical factors. In a preferred embodiment, compositions comprising the anti-FGFR4-antibody and/or Sorafenib or a pharmaceutically acceptable salt thereof can be administered to a patient by oral delivery or by intravenous injection or infusion. In another preferred embodiment, compositions comprising the anti-FGFR4-antibody and/or Sorafenib or a pharmaceutically acceptable salt thereof can be administered to a patient in the form of a tablet, a liquid, a topical gel, an inhaler or in the form of a sustained release composition. The anti-FGFR4-antibody can be administered simultaneously with Sorafenib or a pharmaceutically acceptable salt thereof to a patient, in the same formulation or, more typically in separate formulations and, often, using different administration routes. Administration can also be sequentially, in any order. In a preferred embodiment, the anti-FGFR4 antibody or a functional fragment of said antibody can be administered in tandem with Sorafenib or a pharmaceutically acceptable salt thereof wherein the anti-FGFR4 antibody or a functional fragment of said antibody can be administered to a patient once or more per day for up to 28 consecutive days with the concurrent or intermittent administration of Sorafenib or a pharmaceutically acceptable salt thereof over the same total time period. The combinations of the invention can also be formed in vivo, e. g., in a patient's body. Pharmaceutical preparations containing the above defined anti-FGFR4 antibodies and/or Sorafenib or a pharmaceutically acceptable salt thereof can be administered orally, dermally, parenterally, by injection, by inhalation or spray, sublingually, rectally or vaginally in dosage unit formulations. The term “administration by injection” includes intravenous, intraarticular, intramuscular, subcutaneous and parenteral injections, as well as use of infusion techniques. Dermal administration may include topical application or transdermal administration. One or more compounds may be present in association with one or more non-toxic pharmaceutically acceptable carriers and if desired other active ingredients. Compositions intended for oral use may be prepared according to any suitable method known to the art for the manufacture of pharmaceutical compositions. Such compositions may contain one or more agents selected from the group consisting of diluents, sweetening agents, flavoring agents, coloring agents and preserving agents in order to provide palatable preparations. Tablets contain the active ingredient in admixture with non-toxic pharmaceutically acceptable excipients which are suitable for the manufacture of tablets. These excipients may be, for example, inert diluents, such as calcium carbonate, sodium carbonate, lactose, calcium phosphate or sodium phosphate; granulating and disintegrating agents, for example, corn starch, or alginic acid; and binding agents, for example magnesium stearate, stearic acid or talc. The tablets may be uncoated or they may be coated by known techniques to delay disintegration and adsorption in the gastrointestinal tract and thereby provide a sustained action over a longer period. For example, a time delay material such as glyceryl monostearate or glyceryl distearate may be employed. These compounds may also be prepared in solid, rapidly released form. Formulations for oral use may also be presented as hard gelatin capsules wherein the active ingredient is mixed with an inert solid diluent, for example, calcium carbonate, calcium phosphate or kaolin, or as soft gelatin capsules wherein the active ingredient is mixed with water or an oil medium, for example peanut oil, liquid paraffin or olive oil. Aqueous suspensions containing the active materials in admixture with excipients suitable for the manufacture of aqueous suspensions may also be used. Such excipients are suspending agents, for example sodium carboxymethylcellulose, methylcellulose, hydroxypropyl-methylcellulose, sodium alginate, polyvinylpyrrolidone, gum tragacanth and gum acacia; dispersing or wetting agents may be a naturally-occurring phosphatide, for example, lecithin, or condensation products of an alkylene oxide with fatty acids, for example polyoxyethylene stearate, or condensation products of ethylene oxide with long chain aliphatic alcohols, for example heptadecaethylene oxycetanol, or condensation products of ethylene oxide with partial esters derived from fatty acids and hexitol such as polyoxyethylene sorbitol monooleate, or condensation products of ethylene oxide with partial esters derived from fatty acids and hexitol anhydrides, for example polyethylene sorbitan monooleate. The aqueous suspensions may also contain one or more preservatives, for example ethyl, or n-propyl p-hydroxybenzoate, one or more coloring agents, one or more flavoring agents, and one or more sweetening agents, such as sucrose or saccharin. Dispersible powders and granules suitable for preparation of an aqueous suspension by the addition of water provide the active ingredient in admixture with a dispersing or wetting agent, suspending agent and one or more preservatives. Suitable dispersing or wetting agents and suspending agents are exemplified by those already mentioned above.
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