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MA03 - Epidemiology, Risk Factors and Screening (ID 374)
- Event: WCLC 2016
- Type: Mini Oral Session
- Track: Epidemiology/Tobacco Control and Cessation/Prevention
- Presentations: 1
MA03.03 - High Risk for Second Primary Lung Cancer in Taiwanese Early-Onset Female Breast Cancer Patients (ID 5966)
14:20 - 15:50 | Author(s): C. Lin
Female lung and breast cancers are two distinct disease entities in East Asia. Although studies on second primary cancers following the first breast cancer event have been carried out, no in-depth survey on double primary breast and lung cancers has been done. This study analyzed the association between these two distinct cancer types.
In the exploratory cohort study, the data were obtained from the Taiwan National Health Insurance Research Database, which contained information on approximately 24.7 million insured individuals. The Taiwan Population Census and National Cancer Registry Databases were used to identify patients with breast and lung cancers. The cohort included individuals with newly diagnosed primary breast cancer between 2000 and 2011. An age- and sex-matched systematic random-sampling method was used for subject selection in the reference non-breast cancer cohort. Multivariate Cox proportional hazard regression analysis was used to determine the effects of breast cancer on the risk of lung cancer, as shown by hazard ratios (HRs) with 95% CIs. Detailed medical record and pathological reviews were done on the National Taiwan University Hospital (NTUH) patient cohort to validate the national cohort study results. The national lung cancer incidence rate was used as reference incidence rate in the validation cohort.
A total of 88,439 patients were diagnosed with female breast cancer between 2000-2011 in the national cohort. The HR for subsequent lung cancer was 1.27 (95% CI, 1.09-1.48). When stratified by age, the HR was 5.29 (95% CI, 2.26-12.4) in the patients aged less than 40 years, 1.67 (95% CI, 1.18-2.30) in the group aged 40-49, 1.27 (95% CI, 0.97-1.67) in the group aged 50-59, 1.09 (95% CI, 0.81-1.49) in the group aged 60-69, and 0.70 (95% CI, 0.48-1.02) in the group older than 70 years. A total of 13,517 primary female breast cancer patients were identified in the NTUH electronic medical record system between 2006-2015. The incidence rate ratio for second primary lung cancer was 16.08 in the patients whose primary breast cancer was diagnosed at age younger than 50 years and 1.43 for those diagnosed at age older than 50 years. These results supported the national cohort study findings that early-onset female breast cancer patients bear a relative high risk for second primary lung cancer.
Our findings suggest a relative high risk for second primary lung cancer among patients whose primary female breast cancer is diagnosed at age less than 50 years.
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