ARID1A and adenocarcinoma: Combined with immunohistochemistry results, postoperative pathological records noted a finding of “ulcerative moderately poorly differentiated adenocarcinoma (pT2N2M0G3, stage IIB).” And the gene detection results showed the presence of AT-rich interaction domain 1A (ARID1A) and Tumor Protein P53 (TP53) mutations; findings consistent with phenotypic characteristics of myeloid precursor cells.