C3 and cancer: Our results support observation in the COSMIC Cell Lines Project (http://cancer.sanger.ac.uk) where amplifications of LAIR2, KLRC1, NCR1, NCR3, KLRC2, C3, and C4 were reported in various cancer cell lines such as lung carcinoma, adenocarcinoma, gastric choriocarcinoma, and pancreatic cancer cell lines.