Lower GI 2017

Contact therapy (Papillon)

- Dose prescribed at the surface of the tumor - Steep fall-off of dose with depth

44% at 5 mm 25% at 10 mm

- Delivery of large doses per fraction (approximately 30 Gy per fraction) - Gradual destruction of exophytic tumours layer per layer in a few fractions - 3-4 fractions (90-120 Gy) - 4-6 weeks overall treatment time

Gérard et al. Int J Radiat Oncol Biol Phys. 1996;34(4):775–83. Papillon et al. Int J Radiat Oncol Biol Phys. 1989;17(6):1161-9 Coatmeur et al. Radiother Oncol 2004;70(2):177–82.