Regarding biochemical markers, patients with gastric adenocarcinoma presented significantly elevated levels of total lipids, triglycerides, LDL, CEA, CA19.9, PCR, and LDH (all p < 0.01), as well as decreased Ht (Hematocrit), MCHC (Mean Corpuscular Hemoglobin Concentration), MCV (average volume (size) of a red blood cell), and Hb (Hemoglobin) values (all p < 0.001). This evidence concerns the gene GSTM1 and gastric adenocarcinoma.