Meme Kanserinde Hipofraksiyone Radyoterapi
Özet
Meme kanserinde cerrahi sonrası uygulanan radyoterapi, lokal nüksü ve mortaliteyi azaltmada kritik bir öneme sahiptir. Son yıllarda yapılan çalışmalar, tedavi süresini kısaltarak maliyetleri düşüren ve hasta uyumunu artıran hipofraksiyone (HF) radyoterapi rejimlerinin, konvansiyonel tedaviyle eşdeğer etkinlik sunduğunu kanıtlamıştır. START A, START B ve Kanada çalışmaları gibi geniş ölçekli randomize araştırmalar, 40 Gy/15 fraksiyon ve 42.56 Gy/16 fraksiyon gibi ılımlı HF rejimlerinin 10 yıllık lokal yineleme, hastalıksız sağkalım ve genel sağkalım oranlarında standart 50 Gy/25 fraksiyon rejimine göre istatistiksel olarak farksız olduğunu ortaya koymuştur. Yan etkiler açısından incelendiğinde, HF rejimlerin meme cildinde sertleşme, ödem ve telenjiyektazi gibi geç dönem doku toksisitelerini artırmadığı, aksine akut cilt reaksiyonlarını azalttığı gözlenmiştir. Ayrıca sol meme ışınlamalarında korkulan kardiyak mortalite riskinin de konvansiyonel rejimlerle benzer seviyede olduğu uzun dönemli takiplerle gösterilmiştir. Güncel uluslararası kılavuzlar (ASTRO, NCCN, NICE), yaş, tümör gradı veya sistemik tedavi kullanımından bağımsız olarak HF radyoterapiyi tüm meme kanseri hastaları için standart bir yaklaşım olarak önermektedir. Günümüzde FAST-Forward gibi ultra hipofraksiyone (1 haftada 5 fraksiyon) rejimler ile lenfatik ışınlama, eş zamanlı boost (SİB) ve rekonstrüksiyon geçiren hastalara yönelik spesifik HF uygulamalarının etkinliğini değerlendiren çok sayıda klinik araştırma aktif olarak devam etmektedir.
Postoperative radiotherapy in breast cancer plays a critical role in reducing local recurrence and cancer mortality. Recent milestone studies have demonstrated that hypofractionated (HF) radiotherapy regimens, which shorten treatment duration, reduce healthcare costs, and improve patient compliance, offer equivalent efficacy compared to conventional schedules. Large-scale randomized clinical trials, including START A, START B, and the Canadian trial, have revealed that moderate HF regimens such as 40 Gy/15 fractions and 42.56 Gy/16 fractions show no statistically significant differences in 10-year local recurrence, disease-free survival, and overall survival rates compared to the standard 50 Gy/25 fractions schedule. Regarding adverse effects, HF regimens do not increase late normal tissue toxicities, such as breast induration, edema, and telangiectasia, and they even significantly reduce acute skin reactions. Furthermore, long-term follow-up data have shown that the risk of cardiac mortality, a major concern particularly in left-sided breast irradiations, remains comparable to conventional treatment. Current international consensus guidelines (ASTRO, NCCN, NICE) recommend HF radiotherapy as the standard approach for breast cancer patients, irrespective of age, tumor grade, or systemic therapy. Today, numerous ongoing clinical trials are actively evaluating ultra-hypofractionated schedules (5 fractions in 1 week), regional nodal irradiation, simultaneous integrated boost (SIB) techniques, and the safety of HF applications in patients undergoing breast reconstruction.
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