Initial clinical experience of postmastectomy intensity modulated proton therapy in patients with breast expanders with metallic ports.

Purpose: The feasibility of proton postmastectomy radiation therapy in patients reconstructed with expanders has not been previously reported, limiting treatment options. We analyzed the dosimetric impact of the metallic port contained within expanders on intensity modulated proton therapy (IMPT) and report our techniques and quality control for treating patients in this setting.

Methods And Materials: Twelve patients with the same expander model underwent 2-field IMPT as part of a prospective registry.