Randomisation and masking
adenocarcinoma
ADENOCARCINOMA
All patients were randomly assigned in a 1:1 ratio to receive either of the two interventions by computer. Treatments were randomly assigned based on single-station N2 or multiple-station N2, adenocarcinoma or non-adenocarcinoma, never smoked or former smoked or currently smoked, male or female. Neither the study investigators nor the patients were masked.