RT Journal Article SR Electronic T1 PD-L1 expression associated with better response to EGFR tyrosine kinase inhibitors JF Cancer Biology and Medicine JO Cancer Biol Med FD China Anti-Cancer Association SP 71 OP 73 DO 10.7497/j.issn.2095-3941.2015.0026 VO 12 IS 2 A1 Rosell, Rafael A1 Palmero, Ramón YR 2015 UL http://www.cancerbiomed.org/content/12/2/71.abstract AB