We have found frequent loss of CDKN2A (62.5%, 10 out of 16) and overexpression of several SLC family transporters including xCT, Cystine transporter (SLC7A11 gene; 80% 12 out of 15), PROT, Proline transporter (SLC6A7 gene; 100% 5 out of 5) and GLAST, glutamate and aspartate transporter (SLC1A3 gene; 80% 4 out of 5) in CDC cases [2]. Here, SLC6A7 is linked to collecting duct carcinoma.