Significance of mesothelin and CA125 expression in endometrial carcinoma: a retrospective analysis.

Background: This study aimed to investigate the association between clinicopathologic factors, mesothelin, and cancer antigen (CA) 125 in endometrial carcinoma.

Methods: Between 1989 and 2017, patients with endometrial carcinoma who underwent total hysterectomy and bilateral salpingo-oophorectomy at our hospital were identified. The association between either or both immunochemical expression of mesothelin and CA125 and clinicopathological features were retrospectively examined.

Results: Among 485 patients, 171 were positive for mesothelin, 368 were positive for CA125, and 167 were positive for mesothelin and CA125. The expression of mesothelin and CA125 was positively correlated (p < 0.01). More patients with mesothelin expression showed myometrial invasion of more than 50% (p = 0.028) and positive lymphovascular invasion (p = 0.027). Similarly, more patients with co-expression of mesothelin and CA125 had myometrial invasion of more than 50% (p = 0.016) and positive lymphovascular invasion (p = 0.02). Patients with mesothelin expression and co-expression of mesothelin and CA125 demonstrated worse progression-free survival (PFS) and overall survival (OS). In the multivariate analysis, mesothelin expression and co-expression were poor prognostic factors for PFS (mesothelin expression: hazard ratio [HR] = 2.14, p < 0.01; co-expression: HR = 2.19, p < 0.01) and OS (mesothelin expression: HR = 2.18, p < 0.01; co-expression: HR = 2.22, p < 0.01).

Conclusions: Mesothelin expression and co-expression might be associated with tumor aggressiveness and poor prognosis in patients with endometrial carcinoma. Persons with mesothelin-expressing endometrial cancers present a particularly high medical unmet need.