- Prior chemotherapy will be allowed for other invasive malignancies, provided at least five years has elapsed since the completion of therapy and enrollment on this protocol. No prior chemotherapy for metastatic non-small cell lung cancer (NSCLC) will be allowed. Prior adjuvant or neoadjuvant chemotherapy for NSCLC will be allowed, provided at least six months have elapsed from the last dose of chemotherapy to the documentation of relapsed disease.