Welcome to the NICER Malignancy + Inborn Errors of Immunity Forum! Optimal treatment for cancers occurring in patients with inborn errors in immunity is not well delineated and complete information related to disease mechanism is infrequently available. Additionally, many patients with IEI present with malignancy as their initial manifestation of IEI. This group list (exclusive to NICER members only!) was established to foster more robust communication between providers caring for patients with IEI and physicians screening for and treating malignancies in IEI. Patient-specific queries are welcome, but kindly remember to remove all PHI prior to posting.