TREX1 and cholangiocarcinoma: Most notably, ≥ 70% of the samples with TREX1 copy number increase in BLCA, CHOL (cholangiocarcinoma), DLBC (diffuse B-cell lymphoma), KICH, KIRP, LAML (acute myeloid leukemia), PAAD, and SKCM (skin cutaneous melanoma) also had 3p gain.