On October 11, 2018, a collaboration between Radboudumc and the Netherlands Cancer Registry (NCR) resulted in the initiative to start a national collaboration for research into gallbladder cancer. This initiative resulted in the foundation of the National Gallbladder Cancer collaborative. This multidisciplinary collaborative operates as part of the Dutch Hepatocellular and Cholangiocarcinoma Group (DHCG). The aim of the collaborative is to improve the treatment and diagnosis of patients with gallbladder cancer. Over the next two years, the collaborative will focus primarily on scientific research and an inventory of the treatment of this type of cancer in the Netherlands. Prospective research will be conducted into the treatment of gallbladder cancer in collaboration with the DHCG and the NCR.