We analyzed BAG3 expression in 69 samples (36 small cell lung cancers, 13 squamous cell carcinomas, 13 adenocarcinomas, 4 large cell carcinomas and 3 normal lung samples as control) by immunoistochemistry (IHC), using an anti-BAG3 polyclonal antibody (TOS-2). This evidence concerns the gene BAG3 and adenocarcinoma.