Objective To analysis the correlation between uncertainty in illnesses and perceived control in patients with non - small - cell lung cancer (NSCLC) undergoing chemotherapy. Methods A consecutive sample of 145 patients with NSCLC were recruited and assessed with socio- demographic, medical data, the scales of the Michel's Chinese version of uncertainty in illness and the cancer experience and efficacy scale (CEES). Results The total score of the uncertainty in illness in patients with NSCLC was (98. 56 ± 9.99 ) points, the total score o...