AICDA and mismatch repair cancer syndrome 1: The observed mutational processes were linked to HR and MMR deficiency (SBS3, SBS14, SBS26, SBS44), chemotherapy (SBS17B (5-FU-related), SBS25, SBS35 (platinum)), AID activity (SBS84), duocarmycin exposure (SBS90), and colibactin exposure (ID18).