SDC1 and neoplasm: In the Luminal subtype, high SDC1 expression in tumor cells was significantly associated with worse patient OS [HR: 1.82 (1.02, 3.25), P = 0.0443], whereas no significant association was observed in HER2 + and triple-negative breast cancer [HR: 0.95 (0.24, 3.71), P = 0.9384 for both].