“…More rigorous treatment strategies are clearly needed for advanced tumors. Numerous authors report a better target/normal tissue dose distribution using intensity-modulated radiation therapy (IMRT), stereotactic irradiation (SRT), or two-step intensity-modulated arch therapy (two-step IMAT) [4,5,16,20,24,41,47,58,64,70]. These modalities can allow for optimization of the dose distribution and administration of higher cumulative irradiation doses (e.g., 81 Gy).…”