What question did this study set out to answer?

The study aims to compare the incidence, characteristics, and survival outcomes of first and second primary breast cancers.

March 2, 2026Clinical and Experimental Obstetrics & GynecologyOpen Access

First Versus Second Primary Breast Cancer: A Surveillance, Epidemiology, and End Results-Based Comparison of Incidence, Treatment, and Survival

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The study aims to compare the incidence, characteristics, and survival outcomes of first and second primary breast cancers.
Analyzed 595,903 cases of first primary breast cancer and 31,055 cases of second primary breast cancer from the SEER database.
Focused on incidence rates, demographics, and survival-related factors from 2010 to 2021.
Evaluated the impact of different treatment regimens on survival across various patient subgroups.
Incidence of second primary breast cancer increased consistently, while first primary breast cancer incidence remained stable.
Patients with second primary breast cancer had significantly worse survival rates compared to those with first primary breast cancer.
Multiple factors such as age, race, treatment type, and tumor characteristics were identified as independent prognostic factors affecting survival.

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Implication

This analysis compares incidence, clinical characteristics, and survival in breast cancer types, suggesting significant differences in treatment outcomes.

Cite This Study

Cai et al. (2026) studied this question.

synapsesocial.com/papers/69a52e45f1e85e5c73bf1d68 https://doi.org/10.31083/ceog45692

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Implication

This analysis compares incidence, clinical characteristics, and survival in breast cancer types, suggesting significant differences in treatment outcomes.

First Versus Second Primary Breast Cancer: A Surveillance, Epidemiology, and End Results-Based Comparison of Incidence, Treatment, and Survival

Key Points

Discussion

Implication

Cite This Study

First Versus Second Primary Breast Cancer: A Surveillance, Epidemiology, and End Results-Based Comparison of Incidence, Treatment, and Survival

Key Points

Discussion

Implication

Cite This Study

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