title: Reply to the Letter to the Editor by Hendriks et al.
authors.affiliation: Department of Medical Oncology, West German Cancer Centre, Ruhrlandklinik, University Hospital Essen, University Duisburg-Essen, Essen, Germany. Electronic address: wilfried.eberhardt@uni-duisburg-essen.de.
authors.forename: Wilfried Ernst Erich
authors.initials: WE
authors.lastname: Eberhardt
authors.affiliation: Cancer Research and Biostatistics, Seattle, Washington.
authors.forename: Alan
authors.initials: A
authors.lastname: Mitchell
authors.affiliation: Department of Thoracic Surgery, Hospital Universitari Mutua Terrassa, CIBERES Lung Cancer Group, Terrassa, Barcelona, Spain.
authors.forename: Ramon
authors.initials: R
authors.lastname: Rami-Porta
mesh_terms: D006801:Humans; D008175:Lung Neoplasms