Metastatic or unresectable recurrent breast cancer; Stage IIIC or IV recurrent platinum-resistant ovarian cancer; Metastatic or unresectable recurrent cervix cancer; Metastatic or unresectable recurrent endometrial cancer; Metastatic or unresectable recurrent head and neck cancer (after previous radiotherapy); Hormone-refractory metastatic or unresectable recurrent prostate cancer; Metastatic or unresectable recurrent genitourinary cancer; Metastatic or unresectable recurrent non-small cell lung cancer; Extensive-stage or recurrent small cell lung cancer; Metastatic or unresectable recurrent gastrointestinal cancer;