<prompt> Most chemoresistani tumors among the following is:Synol sarcomaOsteosarcomaMalignant fibrous histiocytomaEmbryonal rhabdomyosarcoma  <response>: Malignant fibrous histiocytoma Repeat Nov 2006 Of the given options Malignant fibrous histiocytoma appears to be most chemoresistant. Chemotherapy forms a pa of tt of all the other three options, whereas only surgery radiotherapy are the tt options for malignant fibrous histiocytoma see the above references Chemosensitivity of different tumors 1.Highly sensitive which may be used by chemotherapy Teratoma of testes Hodgkins disease High grade non-Hodgkin lymphoma Wilms tumour Embryonal rhabdomyosarcoma Chorio-carcinoma Acute lymphoblastic leukaemia in children Ewings sarcoma 2.Moderately sensitive in which chemotherapy may contribute to cure Small cell carcinoma Breast carcinoma Low grade non-Hodgkin lymphoma Acute myeloid leukaemia Ovarian cancer Myeloma 3. Relatively insensitive in which chemotherapy may sometimes produce palliation Gastric carcinoma Bladder carcinoma Squamous carcinoma of head and neck Soft tissue sarcoma 