For calpain-1 and Syk expression, a weak correlation was found in the whole cohort and also in HGSCs (Syk-c: rs = 0.347, P < 0.001, n = 257; Syk-n: rs = 0.313, P < 0.001, n = 257) and CCCs (Syk-c: rs = 0.378, P = 0.014, n = 42; Syk-n: rs = 0.327, P = 0.035, n = 42), whilst a moderate correlation was found in mucinous tumours (Syk-c: rs = 0.425, P = 0.007, n = 39; Syk-n: rs = 0.471, P = 0.002, n = 39), no correlation was detected between calpain-1 and Syk expression in LGSCs or endometrioid tumours. This evidence concerns the gene SYK and mucinous neoplasm.