- 4. Received only one prior chemotherapy regimen consisting of ≥ 4 cycles of pemetrexed/cisplatin or pemetrexed/carboplatin; subjects must have documentation of an ongoing response (confirmed PR or SD) following completion of this regimen. Subjects changing from cisplatin to carboplatin or vice versa within the same course of treatment because of platinum toxicity will be considered to have had first-line chemotherapy. Note: Subjects may have undergone previous surgical resection of their disease providing it was completed prior to initiation of chemotherapy.