ALDH1A1 and Familial prostate cancer: Based on various studies, it appears that the ALDH family has 19 isoforms that are expressed to a greater extent in the cancer of specific areas of the body; for example ALDH1A3 isoform in breast cancer, ALDH7A1 isoform in prostate cancer, and ALDH1A1 in pancreatic cancer (31).