Abstract: This study investigated the clinical outcomes of a 4-fraction stereotactic radiotherapy (SRT) study using helical tomotherapy for brain metastases. Between August 2009 and June 2013, 54 patients with a total of 128 brain metastases underwent SRT using tomotherapy. A total dose of 28 or 28.8 Gy at 80% isodose was administered in 4 fractions for all tumors. The mean gross tumor volume (GTV) was 1.9 cc. Local control (LC) rates at 6, 12, and 18 months were 96%, 91%, and 88%, respectively. The 12-month LC rates for tumors with GTV ≤0.25, >0.25 and ≤1, and >1 cc were 98%, 82%, and 93%, respectively; the rates were 92% for tumors >3 cc and 100% for >10 cc. The 6-month rates for freedom from distant brain failure were 57%, 71%, and 55% for patients with 1, 2, and >3 brain metastases, respectively. No differences were significant. No major complications were observed. The 4-fraction SRT protocol provided excellent tumor control with minimal toxicity. Distant brain failure was not so frequent, even in patients with multiple tumors. The results of the current study warrant a prospective randomized study comparing single-fraction stereotactic radiosurgery (SRS) with SRT in this patient population.
Keywords: brain metastases; stereotactic radiotherapy; helical tomotherapy
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Nagai, A.; Shibamoto, Y.; Yoshida, M.; Wakamatsu, K.; Kikuchi, Y. Treatment of Single or Multiple Brain Metastases by Hypofractionated Stereotactic Radiotherapy Using Helical Tomotherapy. Int. J. Mol. Sci. 2014, 15, 6910-6924.
Nagai A, Shibamoto Y, Yoshida M, Wakamatsu K, Kikuchi Y. Treatment of Single or Multiple Brain Metastases by Hypofractionated Stereotactic Radiotherapy Using Helical Tomotherapy. International Journal of Molecular Sciences. 2014; 15(4):6910-6924.
Nagai, Aiko; Shibamoto, Yuta; Yoshida, Masanori; Wakamatsu, Koichi; Kikuchi, Yuzo. 2014. "Treatment of Single or Multiple Brain Metastases by Hypofractionated Stereotactic Radiotherapy Using Helical Tomotherapy." Int. J. Mol. Sci. 15, no. 4: 6910-6924.