CAST and clear cell adenocarcinoma: High calpastatin expression was associated with younger patients (χ2 = 4.955, df = 1, P = 0.026) and high-grade serous carcinoma (HGSC) (χ2 = 17.403, df = 5, P = 0.004) whilst low calpastatin expression was linked with clear-cell carcinoma (CCC).