On the other hand, COL15A1 levels were revealed to be decreased in some tumors when compared to normal tissues, including bladder urothelial carcinoma (BLCA), breast invasive carcinoma (BRCA), kidney renal papillary cell carcinoma (KIRP), thymoma (THYM), cervical squamous cell carcinoma, and endocervical adenocarcinoma (CESC), Uterine Corpus endometrial carcinoma (UCEC), and pancreatic adenocarcinoma (PAAD). Here, COL15A1 is linked to pancreatic adenocarcinoma.