RecruitingPhase 2Drug trialSacituzumab Govitecan in Recurrent GlioblastomaThis is an open-label single arm study. All patients will receive the study drug. The aim of the study is to compare overall survival (OS) of patients with recurrent brain tumor, known as Glioblastoma (GBM) having high levels of a protein, Trophoblast cell surface antigen 2 (Trop-2), expression on treatment with Sacituzumab Govitecan (SG) versus lomustine only which has been used in the past.