“…While all cholangiocarcinoma subtypes share several somatic mutations, including TP53 and KRAS, recent next-generation sequencing has identified unique genetic aberrations dependent on the CCA subtype [ 62 ]. While most sequencing studies group HC and distal CCA together for analysis, one study suggested that HC has a distinct molecular subtype [ 63 ]. High-frequency HC subtype-specific mutations include TP53, KRAS, mTOR, ABL1, NOTCH1, PBRM1, PIK3CA, ARID1A, NF1, and EGFR [ 64 ].…”