Characteristics of Patients With Second Primary Lung Cancer Following Breast Cancer: A Retrospective Descriptive...

Area of Science:

• Oncology
• Cancer Epidemiology

Background:

• Breast cancer (BC) is the most common cancer in women.
• BC survivors have an elevated risk of secondary malignancies, most commonly lung cancer (LC).
• Limited research exists on the clinicopathological details of LC in BC survivors.

Purpose of the Study:

• To investigate the clinicopathological characteristics of lung cancer in breast cancer survivors.
• To compare these characteristics with general BC and LC populations.
• To identify risk factors for secondary lung cancer in breast cancer survivors.

Main Methods:

• Single-institution, retrospective study.
• Identification of BC survivors who developed LC.
• Examination of breast and LC clinical/pathological data.
• Comparison with literature data for general BC and LC populations.

Main Results:

• Radiation therapy for BC was associated with an increased risk of LC (P = .03 for ipsilateral LC).
• Higher smoking rates correlated with increased LC incidence.
• High BRCA positivity (78.9%) was observed in tested patients.
• Increased EGFR mutations (60.9%) and earlier stage NSCLC were noted in BC survivors.

Conclusions:

• Radiation, BRCA mutations, and smoking are potential risk factors for LC in BC survivors.
• Further research may refine screening protocols (e.g., low-dose CT) for early LC detection.
• EGFR-mutated NSCLC in BC survivors suggests a potentially better prognosis and distinct molecular profile.
• Earlier stage NSCLC in this cohort may be due to surveillance, emphasizing the importance of monitoring BC survivors.