Figure 3. Kaplan-Meier graphs of C3H mice bearing aggressive squamous-cell carcinoma (SCCVII) leg carcinomas irradiated with various radiation modalities. The on-centre distances for microbeam radiosurgery (MBRS)-irradiations were 200 µm. Mice euthanized due to foot/leg damage were not distinguished from those euthanized due to tumour overgrowth: (a) Survival graphs of mice bearing SCCVII carcinomas treated with seamless 25 Gy or 35 Gy skin-entrance doses of X-rays in comparison with unirradiated controls. (b) Survival graphs of similar mice in MBRS groups (1–6) with skin entrance doses of 442 Gy, 625 Gy, and 884 Gy at 35 µm and 442 at 70 µm beam width. "Al" designates a 16 mm-thick aluminium filter placed upstream from the collimator.