Association between  BRAF  mutant classification and the efficacy of pemetrexed-based chemotherapy in Chinese advanced non- small cell lung cancer patients: a multicenter retrospective study

Lei Lei, Wen-Xian Wang, You-Cai Zhu, Xing-Xiang Pu, Yong Fang, Hong Wang, Wu Zhuang, Yin-Bin Zhang, Li-Ping Wang, Chun-Wei Xu, Mei-Yu Fang