ERBB2 and adenocarcinoma: In a retrospective analysis of 20 pulmonary sarcomatoid carcinomas (PSC), the frequency of ALK-CNG was significantly higher compared to NSCLC with adenocarcinoma histology (22 % versus 0.02 %) with a mean copy number gain of 7 and a significant association with chromosome 7 (EGFR) and 17 (HER2) polysomy.