An association study was performed to test if genetic variants in ABCB1 were associated with CRC as whole or with any of the subgroups identified according to histological grade, tumor localization (cecum, ascending, transverse and descending colon cancers were pooled and indicated in the table as colon) and patient gender (Tables 2, 3, and 4). Here, ABCB1 is linked to colorectal carcinoma.