GSTM1 and adenocarcinoma: Our finding that MCV, but not RDW or Hb, is a prognostic factor independent of other (hematologic) parameters for patients with adenocarcinomas of the esophagus and the gastroesophageal junction accords well with the data published by Yoon et al.15 underscoring the prognostic potential of a number of possible hematologic prognostic markers.