BRCA1 and hepatocellular carcinoma: The oncogenes c-myc, c-met, k-ras and the neoplastic progression protein-3 (Npn3) were also increased 2- to 3-fold in arsenic-induced HCC and nontumorous, normal liver from arsenic exposed mice, while the tumor suppressors BRCA1 and BRCA2 decreased 30–50%.