At the protein level, data from the UALCAN database revealed that SDC1 was significantly upregulated in breast cancer, uterine corpus endometrial carcinoma (UCEC), lung cancer, pancreatic adenocarcinoma (PAAD), and glioblastoma (GBM), but downregulated in clear cell renal cell carcinoma (KIRC) and liver cancer (LIHC). Here, SDC1 is linked to breast cancer.