KRT7 and gastric adenocarcinoma: Studies have shown that CK 7-/20- pattern is seen in 10% gastric cancers while CK20+/7- pattern is seen in upto 33% of gastric adenocarcinomas while the rest exhibit mixed pattern.14,16-18 We also did not find any association of finding CK 7 or CK 20 with the detection of primary tumor.