This dataset contains processed data from The Cancer Genome Atlas Stomach Adenocarcinoma (TCGA‑STAD) project. TCGA‑STAD is a public cancer genomics resource focused on stomach adenocarcinoma, one of the major subtypes of gastric cancer, and includes clinical, histopathological, and molecular features for integrative analysis. The data may include clinical annotations, gene expression profiles, mutation calls, copy‑number variation, and related omics‑level measurements prepared for downstream bioinformatics and machine‑learning workflows such as survival modeling, biomarker discovery, and molecular subtyping