Fig. 1

Histological images of CAP grading. a CAP 0, complete response to tumor treatment. Acute and chronic inflammation of the stomach wall with fibrous tissue hyperplasia. No viable cancer cells can be found. b CAP 1, almost complete response to tumor treatment. Residual adenocarcinoma in the submucosa of the gastric wall with extensive fibrous tissue hyperplasia. c CAP 2, partial response to tumor treatment. Local gastric cancer cells invade the extramuscular fat tissue with fibrous tissue hyperplasia. d CAP 3, no response to tumor treatment. Local gastric cancer cells invade the muscle layer with no evident tumor regression