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We studied the immunophenotype of signet-ring cell carcinoma (SRCC) of the stomach (30 cases), breast (21 cases), and colon (9 cases) with the following expression patterns: (1) breast: consistent, MUC1 (21 [100%]), cytokeratin (CK) 7 (20 [95%]), estrogen receptor (ER; 17 [81%]); infrequent, E-cadherin (6 [29%]), MUC2, MUC5AC, CK20 (1 [5%] each); negative, CDX2 and hepatocyte paraffin 1 (Hep Par 1; 0 [0%] each); (2) gastric: frequent, CDX2 (27 [90%]) and Hep Par 1 (25 [83%]); variable, E-cadherin and CK20 (17 [57%] each), MUC2 and MUC5AC (15 [50%] each), MUC1 (5 [17%]); negative, ER (0 [0%]); and (3) colon: frequent, MUC2 (9 [100%]), CDX2 and MUC5AC (8 [89%] each); infrequent or negative, MUC1 (3 [33%]), Hep Par 1 (2 [22%]), ER (0 [0%]). Immunohistochemical staining distinguished breast from gastric SRCC (ER, MUC1, Hep Par 1, CDX2) and colon SRCC (ER, CDX2, MUC2, and MUC5AC). Gastric and colon SRCCs showed a similar staining pattern for antibodies tested except for Hep Par 1 and CDX2 (gastric, 83% Hep Par 1 positivity and heterogeneous, weak, patchy CDX2 nuclear staining; colon, 22% Hep Par 1 positivity and homogeneous, strong, diffuse CDX2 nuclear staining). About half of the cases of gastric SRCC expressed MUC2 and MUC5AC, whereas virtually all cases of colon SRCC expressed them.

Immunohistochemical Characterization of Signet-Ring Cell Carcinomas of the Stomach, Breast, and Colon