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[Multiple primary malignant tumors after radical mastectomy].
Gan No Rinsho. Japan Journal of Cancer Clinics
|September 1, 1984
Summary
Women treated for breast cancer have an increased risk of developing a second primary malignancy, particularly contralateral breast cancer. Chemotherapy did not appear to raise this risk.
Area of Science:
- Oncology
- Epidemiology
Context:
- A cohort of 2,427 women diagnosed with primary breast cancer between 1964 and 1982 was analyzed.
- The study investigated the occurrence of second primary malignancies following initial breast cancer treatment.
Purpose:
- To assess the incidence and risk factors for second primary malignancies in breast cancer survivors.
- To evaluate the impact of specific treatments, including chemotherapy, on the risk of subsequent cancers.
Summary:
- Over the study period, 72 cases of second malignancies were observed.
- The overall observed incidence of second malignancies was higher than expected (Observed/Expected ratio [O/E] = 1.40).
- Contralateral breast cancer showed a significantly elevated risk (O/E = 6.37), along with increased risks for uterine corpus and ovarian cancers.
Impact:
- Findings indicate a heightened risk for specific secondary cancers in breast cancer patients, emphasizing the need for long-term surveillance.
- The study suggests that adjuvant chemotherapy (Mitomycin C and Cyclophosphamide) did not increase the incidence of second malignancies compared to controls.