AVPR1A and small cell lung carcinoma: The WX330 SCLC cell line was the highest expresser of V1AR. The pancreatic and ovarian cancer lines expressed low levels of the V1AR and in the colorectal cancer cell lines only HT29 cells expressed V1AR. GRPRs were detected in three out of four lung cancer cell lines (two SCLC and one NSCLC).