MMP1 belongs to the matrix metalloproteinase family, which degrades collagen, gelatin and other substrates to promote the development of liver cancer.[36] CCL5 and ALDH1A3 have been found to have a pro‐tumorigenic effect in various cancers,[37, 38] all of them have the function of promoting invasion and metastasis. The gene discussed is CCL5; the disease is liver cancer.