In 2021, the International Bladder Cancer Group (IBCG) and Global Society of Rare GU Tumors (GSRGT) launched a joint committee on rare variants of bladder cancer. 

Bladder cancer is a significant global health issue, and the incidence of rare variants is increasing. This committee brings together stakeholders from both organizations to collaborate on research, education, and clinical trial endpoints with a focus on rare bladder cancer histologic subtypes and genetic variants