Non-Small Cell Lung Carcinoma in Women: A Retrospective Cohort Study in Indonesia

BACKGROUND: the increasing incidence of lung cancer in female patients has been observed in Indonesia. Lung cancer in female might have different biology process than male, but it has never been evaluated in Indonesia. This study aimed to know characteristics and survival of female patients with non-small-cell lung carcinoma (NSCLC) in Dharmais National Cancer Centre Hospital. METHODS: a retrospective cohort study was performed among NSCLC female patients in Dharmais Cancer Hospital (DCH) between January 2005 and December 2015. Survival analysis was done using the Kaplan-Meir estimation curve with proportional assumption test. Independent prognostic factors were analyzed using the Cox proportional hazard model with a hazard ratio (HR) and its 95% confidence interval (CI). RESULTS: a total of 956 NSCLC cases were retrieved during the study; 268 (28.0%) were female patients. Mean of age in female patients was 56.9 (11.87) years old. Among female patients, 21 (7.8%) were smokers, 244 (91.1%) had adenocarcinoma subtype, and 261 (98.0%) were in advanced stage (III-IV). Median survival was slightly longer in female than male patients (14.9 months vs. 12.2 months; log-rank p=0.055). Significant prognostic factors for survival were older age (>50 y.o) (HR = 0.681; 95% CI = 0.467 - 0.992; p= 0.045) and positive eGFR mutation (HR = 0.393; 95% CI = 0.251 - 0.615; p<0.001). CONCLUSION: female patients contributed to about 28% of all NSCLC cases. They were mostly non-smokers, have more adenocarcinoma histopathology and eGFR mutation. Survival tended to be longer in female than male patients. Age over 50 years and the presence of eGFR mutation were good prognostic factors to survival in female lung cancer patients.