TY - JOUR
T1 - Mapping the location of local and regional recurrences according to breast cancer surgery and radiation therapy
T2 - Results from EORTC 22922/10925
AU - Kaidar-Person, Orit
AU - Giasafaki, Peggy
AU - Boersma, Liesbeth
AU - de Brouwer, Peter
AU - Weltens, Caroline
AU - Kirkove, Carine
AU - Peignaux-Casasnovas, Karine
AU - Budach, Volker
AU - van der Leij, Femke
AU - Vonk, Ernest
AU - Weidner, Nicola
AU - Rivera, Sofia
AU - van Tienhoven, Geertjan
AU - Fourquet, Alain
AU - Noel, Georges
AU - Valli, Mariacarla
AU - Guckenberger, Matthias
AU - Koiter, Eveline
AU - Racadot, Severine
AU - Abdah-Bortnyak, Roxolyana
AU - Bartelink, Harry
AU - Struikmans, Henk
AU - Fortpied, Catherine
AU - EORTC Radiation Oncology and Breast Cancer Groups
AU - Poortmans, Philip M.
N1 - Funding Information: This study was supported by donations from the La Ligue nationale contre le cancer from France; the KWF Kanker Bestrijding from the Netherlands; and from the Kom op tegen Kanker (Stand up to Cancer), the Flemish Cancer Society from Belgium. Peggy Giasafaki’s work as a Fellow at the EORTC Headquarters was supported by a grant from the EORTC Cancer Research Fund. The artwork was done by Alon Person. Publisher Copyright: © 2023 Elsevier B.V.
PY - 2023/8/1
Y1 - 2023/8/1
N2 - The purpose of this study is to evaluate the influence of the extent of surgery and radiation therapy (RT) on the rates and sites of local (LR) and regional recurrences (RR) in the EORTC 22922/10925 trial. Patients and methods: All data were extracted from the trial's individual patients’ case report forms (CRF) and analysed with a median follow-up of 15.7 years. Cumulative incidence curves were produced for LR and RR accounting for competing risks: an exploratory analysis of the effect of the extent of surgical and radiation treatments on LR rate was conducted using the Fine & Gray model accounting for competing risks and adjusted for baseline patient and disease characteristics. The significance level was set at 5%, 2-sided. Frequency tables were used to describe the spatial location of LR and RR. Results: Out of 4004 patients included in the trial, 282 (7%) patients experienced LR and 165 (4.1%) RR, respectively. Cumulative incidence rate of LR at 15 years was lower after mastectomy (3.1%) compared to BCS + RT (7.3%) (F&G: HR (Hazard Ratio) = 0.421, 95%CI = 0.282–0.628, p-value < 0.0001). LR were similar up to 3 years for both mastectomy and BCS but continued to occur at a steady rate for BCS + RT, only. The spatial location of the recurrence was related to the locoregional therapy applied and the absolute gain of RT correlated to stage of disease and extent of surgery. Conclusions: The extent of locoregional therapies impacts significantly on LR and RR rates and spatial location.
AB - The purpose of this study is to evaluate the influence of the extent of surgery and radiation therapy (RT) on the rates and sites of local (LR) and regional recurrences (RR) in the EORTC 22922/10925 trial. Patients and methods: All data were extracted from the trial's individual patients’ case report forms (CRF) and analysed with a median follow-up of 15.7 years. Cumulative incidence curves were produced for LR and RR accounting for competing risks: an exploratory analysis of the effect of the extent of surgical and radiation treatments on LR rate was conducted using the Fine & Gray model accounting for competing risks and adjusted for baseline patient and disease characteristics. The significance level was set at 5%, 2-sided. Frequency tables were used to describe the spatial location of LR and RR. Results: Out of 4004 patients included in the trial, 282 (7%) patients experienced LR and 165 (4.1%) RR, respectively. Cumulative incidence rate of LR at 15 years was lower after mastectomy (3.1%) compared to BCS + RT (7.3%) (F&G: HR (Hazard Ratio) = 0.421, 95%CI = 0.282–0.628, p-value < 0.0001). LR were similar up to 3 years for both mastectomy and BCS but continued to occur at a steady rate for BCS + RT, only. The spatial location of the recurrence was related to the locoregional therapy applied and the absolute gain of RT correlated to stage of disease and extent of surgery. Conclusions: The extent of locoregional therapies impacts significantly on LR and RR rates and spatial location.
KW - Breast cancer
KW - EORTC
KW - Local recurrences
KW - Loco-regional recurrences
KW - Radiotherapy
UR - http://www.scopus.com/inward/record.url?scp=85159679289&partnerID=8YFLogxK
U2 - https://doi.org/10.1016/j.radonc.2023.109698
DO - https://doi.org/10.1016/j.radonc.2023.109698
M3 - Article
C2 - 37211281
SN - 0167-8140
VL - 185
JO - Radiotherapy and oncology
JF - Radiotherapy and oncology
M1 - 109698
ER -