First-line chemotherapy with planned sequential administration of cisplatin/gemcitabine followed by docetaxel in elderly 'unfrail' patients with advanced non-small-cell lung cancer: a multicenter phase II study.

First-line chemotherapy with planned sequential administration of cisplatin/gemcitabine followed by docetaxel in elderly 'unfrail' patients with advanced non-small-cell lung cancer: a multicenter phase II study.