Dana-Farber Study Finds Stage IV Breast Cancer Increasing in Incidence and Proportion Over the Last Decade - Summary - MDSpire

Dana-Farber Study Finds Stage IV Breast Cancer Increasing in Incidence and Proportion Over the Last Decade

A new study from Dana-Farber Cancer Institute shows that cases of stage IV breast cancer, a common but largely difficult to treat disease, are increasing both in incidence and as a proportion of all breast cancer diagnoses. According to the findings, published today JAMA Network Open, the incidence rate of stage IV breast cancer has increased significantly, from 9.5 cases per 100,000 women in 2010 to 11.2 cases per 100,000 women in 2021. Stage IV, or de novo metastatic breast cancer, refers to cancer has already spread to distant organs at the time initial diagnosis.

  • By

  • May 12, 2026

  • 3 min

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Objective:

To evaluate the incidence, proportion, and overall survival of stage IV breast cancer diagnoses in the U.S. from 2010 to 2021.

Approach:
    Key Findings:
    • Incidence of stage IV breast cancer increased from 9.5 cases per 100,000 women in 2010 to 11.2 cases per 100,000 women in 2021.
    • Stage IV breast cancer incidence increased by 1.2 percent per year across all demographics.
    • Proportion of stage IV cases rose from 5.6 percent in 2010 to 6.0 percent in 2021.
    • Overall survival for stage IV breast cancer patients improved moderately across various subtypes.
    • Incidence rate in men increased by 3.7 percent per year, despite men representing less than 1% of breast cancer diagnoses.
    Interpretation:

    Limitations:
    • The study does not provide explanations for the increase in de novo metastatic breast cancer.
    • Further research is needed to understand the factors influencing increased incidence.
    Conclusion:

    Sources:

Original Source(s)

Dana-Farber Study Finds Stage IV Breast Cancer Increasing in Incidence and Proportion Over the Last Decade

  • by

  • May 12, 2026

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