PTK7 and neoplasm: The gene sets enriched in low-PTK7-expressing tumours were HALLMARK ESTROGEN RESPONSE EARLY (NES = −1.99, p = 0.004), HALLMARK ESTROGEN RESPONSE LATE (NES = −1.84, p = 0.004), HALLMARK BILE ACID METABOLISM (NES = −1.71, p < 0.001), and HALLMARK FATTY ACID METABOLISM (NES = −1.70, p = 0.006).