LncRNA RAD51 antisense RNA 1 (RAD51-AS1) located on 15q15.1 has been reported to improve the effectiveness of chemo/radiotherapy for cancer cells in liver cancer (Chen et al. 2018a, b) and repress cancer cell growth in colorectal cancer (Chen et al. 2018a, b; Li et al. 2021a, b). This evidence concerns the gene RAD51 and colorectal cancer.