RPS6KA5 and neoplasm: High MSK1 expression was significantly associated with patients over 40 years (χ2 = 8.283, df = 1, P = 0.004), lower tumour grade (χ2 = 34.505, df = 2, P < 0.001), lower NPI value (χ2 = 9.804, df = 2, P = 0.007), ER-positive tumours (χ2 = 50.186, df = 1, P < 0.001) and PR-positive tumours (χ2 = 41.147, df = 1, P < 0.001).