In gastric adenocarcinomas, Zang et al. found a reduced or absent ARID1A protein expression in 75% (6/8) of ARID1A mutated samples and a strong positivity for ARID1A protein expression in 100% (11/11) of the samples with wild-type ARID1A sequence [92]. This evidence concerns the gene ARID1A and gastric adenocarcinoma.