- Participants may have received any number of prior lines of chemotherapy (other than erlotinib or other EGFR-targeted therapy) for incurable non-small cell lung cancer; (first line platinum-doublet based chemotherapy plus switch maintenance chemotherapy counts as one line of therapy; prior adjuvant chemotherapy for early stage disease does not count as one line of therapy if 12 months or greater elapsed between completion of adjuvant therapy and initiation of first-line systemic therapy; if less than 12 months elapsed, adjuvant chemotherapy counts as one line of therapy)