RARS1 and gastric cancer: The specific aims of the RAR-GASTRIC study were: a) to assess the RARs/RXRs mRNA levels using archival gastric cancer specimens; b) to define potential associations between the expression levels of specific RARs/RXRs and gastric cancer clinical features; c) to establish whether specific retinoic acid receptors were over-represented in any molecular subtype of gastric cancer, using our TCGA/ACRG-like classification; d) to assess the impact of RARs and RXRs on the overall-survival of gastric cancer patients.