A randomised phase II study of pemetrexed versus pemetrexed+erlotinib as second-line treatment for locally advanced or metastatic non-squamous non-small cell lung cancer.

INTRODUCTION

Pemetrexed and erlotinib have been approved as second-line monotherapy for locally advanced or metastatic non-small cell lung cancer (NSCLC). This multicentre, randomised, open-label, parallel phase II study assessed efficacy and safety of pemetrexed versus pemetrexed+erlotinib in patients with advanced non-squamous NSCLC.

METHODS

NSCLC stage III-IV patients who failed one prior platinum-based chemotherapy regimen, ≥ 1 measurable lesion by Response Evaluation Criteria in Solid Tumors, and Eastern Cooperative Oncology Group performance status ≤ 2 were eligible. Patients received pemetrexed 500 mg/m(2) with vitamin B12 and folic acid q3w alone or combined with erlotinib 150 mg daily. The primary end-point was progression-free survival (PFS). Secondary end-points were overall survival (OS), time-to-treatment failure (TTTF), response and toxicity.

RESULTS

Of 165 randomised non-squamous patients, 159 were treated (pemetrexed: 83; pemetrexed+erlotinib: 76). The median PFS (months; 95% CI) was 2.89 (1.94, 3.38) for pemetrexed versus 3.19 (2.86, 4.70) for pemetrexed+erlotinib (hazard ratio [HR] 0.63; 95% CI: (0.44, 0.90); P = 0.0047). The median OS (months; 95% CI) was 7.75 (5.29, 10.41) for pemetrexed versus 11.83 (8.18, 16.66) for pemetrexed+erlotinib (HR: 0.68; 95% CI: 0.46, 0.98; P = 0.019). The median TTTF (months: 95% CI) was 2.4 (1.74, 2.99) for pemetrexed versus 3.0 (2.23, 4.07) for pemetrexed+erlotinib (HR 0.64; 95% CI: 0.46, 0.89; P = 0.0034). One patient died in pemetrexed+erlotinib arm due to febrile neutropenia. Grades 3/4 drug-related toxicities (in ≥ 5% of patients) in pemetrexed/pemetrexed+erlotinib were febrile neutropenia (2.4%/10.5%), diarrhoea (1.2%/5.3%), rash (1.2%/9.2%); anaemia (6%/11.8%), leukopenia (9.6%/23.7%), neutropenia (9.6%/25.0%), and thrombocytopenia (4.8%/14.5%).

CONCLUSIONS

Pemetrexed+erlotinib treatment significantly improved PFS, OS and TTTF in 2nd line non-squamous NSCLC and was associated with an increase in grade 3/4 toxicities compared with pemetrexed alone.