Immunostaining was done with appropriate positive and negative controls and revealed:
CD20: Positive in tumor cells.
CD3: Negative in tumor cells.
CK: Negative in tumor cells.
Ki-67 labeling index about 50%.
Gastric mass and duodenal nodules.
Two referred paraffin blocks of the previously submitted case coded 1310.
Gastric mass and duodenal nodules, endoscopic biopsy: