Next to measuring TGF‐β1 production by PBMC from patients, we decided to measure the levels of the cytokine in the plasma of a further group of non‐genotyped patients with gastric adenocarcinoma (N = 30), to evaluate TGF‐β1 plasma levels as an independent prognostic marker. Here, TGFB1 is linked to gastric adenocarcinoma.