 Two combinations treatments will be evaluated in Cohort 1, the doublet and triplet. Initially MCLA-128 is given in combination with trastuzumab in the doublet. After the safety of the doublet has been assessed in 4-6 patients, MCLA-128 is given in combination with trastuzumab and vinorelbine in the triplet, in parallel to the efficacy expansion of the doublet. 