Meme Kanseri Uygulamalarında Farklı Radyoterapi Teknikleri
Özet
Meme kanseri tedavisinde cerrahi sonrası uygulanan postoperatif radyoterapi (RT), lokal nüksleri azaltmada ve sağkalımı artırmada standart bir adjuvant yöntemdir. Ancak klasik tekniklerde kalp ve akciğer gibi kritik organların maruz kaldığı yüksek radyasyon dozları, yaşam avantajını sınırlayan geç dönem toksisitelere yol açmıştır. Bu yan etkileri minimize etmek amacıyla, iki boyutlu (2D) tedavi yöntemlerinden üç boyutlu konformal radyoterapiye (3D-CRT) geçilmiş, zamanla hedef hacmi daha hassas çevreleyen yoğunluk ayarlı radyoterapi (IMRT) ve volümetrik modülasyonlu ark tedavisi (VMAT) gibi modern teknikler geliştirilmiştir. Günümüzde, sol taraflı meme kanserlerinde kardiak toksisiteyi önlemek için derin nefes tutma (DIBH) ve yüzüstü (prone) pozisyonlama gibi kalp koruyucu yaklaşımlar entegre edilmektedir. Büyük memeli veya bilateral meme kanserli olgularda doz homojenliğini sağlamak adına helikal tomoterapi, tVMAT ve proton tedavileri (IMPT) gibi ileri teknolojiler öne çıkmaktadır. Ayrıca, uygun düşük riskli hastalarda tedavi süresini kısaltan akselere parsiyel meme radyoterapisi (APMRT) ve cerrahi esnasında tek doz uygulanan intraoperatif radyoterapi (IORT) güncel birer seçenek haline gelmiştir. Sonuç olarak, gelişen konformal ve adaptif teknolojiler, normal doku korumasını maksimuma çıkararak tedavi başarısını optimize etmektedir.
Postoperative radiotherapy (RT) after surgery in breast cancer treatment is a standard adjuvant method that reduces local recurrences and increases overall survival. However, high radiation doses delivered to critical organs like the heart and lungs in conventional techniques led to late toxicities limiting survival advantages. To minimize side effects, treatment modalities evolved from two-dimensional (2D) methods to three-dimensional conformal radiotherapy (3D-CRT), and subsequently to intensity-modulated RT (IMRT) and volumetric modulated arc therapy (VMAT), which conform more precisely to target volumes. Currently, heart-sparing approaches such as deep inspiration breath-hold (DIBH) and prone positioning are integrated to prevent cardiac toxicity in left-sided breast cancers. In cases with large breasts or synchronous bilateral breast cancer, advanced technologies like helical tomotherapy, tVMAT, and proton therapies (IMPT) stand out to ensure dose homogeneity. Additionally, accelerated partial breast irradiation (APBI) and single-dose intraoperative RT (IORT) applied during surgery have become contemporary options that shorten treatment duration for selected low-risk patients. Consequently, advancing conformal and adaptive technologies optimize treatment success while maximizing normal tissue sparing.
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