CBX4 and neoplasm: Tumor size (HR 1.875, 95% CI 1.382–2.545, P=5.4 × 10−5), histological grade (HR 1.588, 95% CI 1.256–2.008, P=1.1 × 10-4) as well as Cbx4 expression (HR 1.705, 95% CI 1.301–2.233, P=1.0 × 10−4) were determined as independent prognostic factors for OS.