Postmastectomy Radiation Therapy in Women with T1-T2 Tumors and 1 to 3 Positive Lymph Nodes: Analysis of the Breast International Group 02-98 Trial

Youssef H Zeidan, Joyce G Habib, Lieveke Ameye, Marianne Paesmans, Evandro de Azambuja, Richard D Gelber, Ian Campbell, Bo Nordenskjöld, Jorge Gutiérez, Michael Anderson, Ana Lluch, Michael Gnant, Aron Goldhirsch, Angelo Di Leo, David J Joseph, John Crown, Martine Piccart-Gebhart, Prudence A Francis

    48 Citationer (Scopus)

    Abstract

    PURPOSE: To analyze the impact of postmastectomy radiation therapy (PMRT) for patients with T1-T2 tumors and 1 to 3 positive lymph nodes enrolled on the Breast International Group (BIG) 02-98 trial.

    METHODS AND MATERIALS: The BIG 02-98 trial randomized patients to receive adjuvant anthracycline with or without taxane chemotherapy. Delivery of PMRT was nonrandomized and performed according to institutional preferences. The present analysis was performed on participants with T1-T2 breast cancer and 1 to 3 positive lymph nodes who had undergone mastectomy and axillary nodal dissection. The primary objective of the present study was to examine the effect of PMRT on risk of locoregional recurrence (LRR), breast cancer-specific survival, and overall survival.

    RESULTS: We identified 684 patients who met the inclusion criteria and were included in the analysis, of whom 337 (49%) had received PMRT. At 10 years, LRR risk was 2.5% in the PMRT group and 6.5% in the no-PMRT group (hazard ratio 0.29, 95% confidence interval 0.12-0.73; P = .005). Lower LRR after PMRT was noted for patients randomized to receive adjuvant chemotherapy with no taxane (10-year LRR: 3.4% vs 9.1%; P = .02). No significant differences in breast cancer-specific survival (84.3% vs 83.9%) or overall survival (81.7% vs 78.3%) were observed according to receipt of PMRT.

    CONCLUSION: Our analysis of the BIG 02-98 trial shows excellent outcomes in women with T1-T2 tumors and 1 to 3 positive lymph nodes found in axillary dissection. Although PMRT improved LRR in this cohort, the number of events remained low at 10 years. In all groups, 10-year rates of LRR were relatively low compared with historical studies. As such, the use of PMRT in women with 1 to 3 positive nodes should be tailored to individual patient risks.

    OriginalsprogEngelsk
    TidsskriftInternational Journal of Radiation Oncology Biology Physics
    Vol/bind101
    Udgave nummer2
    Sider (fra-til)316-324
    Antal sider9
    ISSN0360-3016
    DOI
    StatusUdgivet - 1 jun. 2018

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