Regarding comorbidities, a greater proportion of patients with lung cancer and VTE at baseline had a history of VTE, gastrointestinal bleeding, decreased renal function (creatinine clearance ≤ 50 mL/min), anemia (hemoglobin [Hb] < 10 g/dL), and white blood cell (WBC) count greater than 11 × 109/L, compared with patients with lung cancer without VTE. This evidence concerns the gene GSTM1 and anemia (phenotype).