SARS-CoV-2 vaccination in patients with GI and hepatobiliary carcinoma: a call for booster vaccination.

Competing Interests: Competing interests: CB received honoraria for lectures and/ or consultancies from AbbVie, Gilead, Janssen, MSD, ViiV and funding from Dt. Leberstiftung, DZIF, Hector Stiftung, NEAT ID. MAG-C has contributed to advisory boards for Roche, Eisai, BMS, MSD and AZ. MBM received travel expenses and honoraria from Gilead and Virology Education. GJR received travel expenses and honoraria from Gilead. JR has received honoraria for lectures and/or consultancies from Abivax, Galapagos, Gilead, Merck, Janssen, Theratechnologies and ViiV. However, these activities have no potential conflicts of interest with the manuscript.