Patients with Lung Cancer Followed by Breast CancerHave a Better Prognosis than Patients with these Cancersin the Opposite Order due to Differences in PathologicalComponents

Abstract

Objectives: To explore the prognostic differences between lung cancer followed by breast cancer (LFB) and breastcancer followed by lung cancer (BFL) and the reasons for the differences. Methods: The database we chose was SEER 18 Regs, from which we retrieved data from patients diagnosed with mul tiple primary standardized incidence rate (MP-SIR) segments of cancer. Results: A total of 7169 patients were included, of whom 979 were patients with LFB and 6190 were BFL patients. Theproportion of small cell lung carcinoma in LFB was 4%, which was significantly lower than that in BFL (p