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Mental state as a possible independent prognostic variable for survival in patients with advanced lung carcinoma
Yasuharu Nakahara1, Yoshiro Mochizuki, Yoshihiro Miyamoto
1Department of Respiratory Medicine, Himeji National Hospital, Himeji-city, Japan. nkhr@meg.winknet.ne.jp
Background:
Although psychologic factors have been reported to influence the progression of cancer, this theory remains controversial. A prospective study of patients with advanced lung carcinoma was performed to explore the influence of the patient's mental state on survival.
Methods:
The patient's mental state was assessed with the Tokyo University Egogram. In a preliminary study, the egograms of long-term survivors (survival > 3 years) with TNM Stage IIIB or Stage IV lung carcinoma were compared with the egograms of consecutive, newly diagnosed lung carcinoma patients (controls). Next, in a prospective study, 123 patients with nonsmall cell lung carcinoma and 56 patients with small cell lung carcinoma (Stage IIIB or Stage IV; Eastern Cooperative Oncology Group performance status of 0 or 1) completed the egogram. Based on the results of the preliminary study, the subjects in the prospective study were divided into Group A (Free Child [FC] >or= 50th percentile and Adapted Child [AC] < 50th percentile) and Group B (FC < 50 percentile or AC >or= 50 percentile). The survival of the two groups was compared. The Cox proportional hazards model was used to determine the joint effect of the patient's mental state and other prognostic factors.
Results:
In the preliminary study, the FC score of the long-term survivors was significantly higher and the AC score was significantly lower than those of the controls. In the prospective study, the survival of Group A was significantly longer than that of Group B both in the nonsmall cell lung carcinoma and small cell lung carcinoma patients (P = 0.002 and P = 0.005, respectively, by the log-rank test). Multivariate analysis demonstrated that after adjustment for clinical factors, being in Group A was a significant predictor of survival both in the nonsmall cell and small cell lung carcinoma patients.
Conclusions:
The results of the current study demonstrate that the mental state of the patient as assessed by the egogram may have prognostic significance in patients with advanced lung carcinoma.