GW572016 With Docetaxel and Trastuzumab for the Treatment Of Untreated ErbB2 Over-Expressing Metastatic Breast Cancer

The phase I part of the study will include cohorts of 3 patients to investigate doses of lapatinib (750mg, 1000mg, 1250mg, 1500mg) with 75mg/m2 3- weekly docetaxel plus standard weekly doses of trastuzumab with prophylactic use of growth factors in all patients. Further cohorts may be explored with prophylactic use of growth factors at the doses stipulated in the phase I dose escalation schema