Efficacy of pembrolizumab in patients with pituitary carcinoma: report of four cases from a phase II study ========================================================================================================== * Nazanin Majd * Steven G Waguespack * Filip Janku * Siqing Fu * Marta Penas-Prado * Mingxuan Xu * Anas Alshawa * Carlos Kamiya-Matsuoka * Shaan M Raza * Ian E McCutcheon * Aung Naing