GSTM1 and adenocarcinoma: The difference of VTE-risk between histologic subtypes remained statistical significant for the whole study period including the postoperative period in a multivariable model including baseline Hb, thrombocyte count, neutrophils, BMI and treatment arm (Adenocarcinoma 11.1% vs. SCC 4.5%, OR 2.93 [95%CI 1.02–8.44], p = 0.046).