ARID1A and cholangiocarcinoma: There was no significant difference in overall survival between ARID1A mutated and wildtype CCA (HR = 1.229, 95% CI [0.961–1.573]), Ov-CCA (HR = 0.874, 95% CI [0.579–1.319]) and non Ov-CCA (HR = 1.260, 95% CI [0.919–1.727]) (Figs. 2D–2F).