Common Differential Markers (sensitivity)
Lung TTF-1 (82%); Napsin A (33%)
Breast MUC1 (100%); CK 7 (95%); ER (81%)
Gastric CDX2 (90%); Hep Par 1 (83%);
CK20 (57%), MUC2 (50%)
Colon MUC2 (100%); CDX2 (89%)
Prostate PSA, PSAP
Bladder CK7, CK20, CDX-2, E-cadherin, CEA, EMA, villin
Table 1: Differential diagnosis of signet-ring cell carcinoma from different tissue origins [16-18].