Radiotherapy Targeting the Causative Lesion of Horner’s Syndrome in Metastatic Breast Cancer: A Case Report and Literature Review. - Suzuki, Gen; Masui, Koji; Ikeda, Satoshi; Hirano-Tobo, Shoko; Yamaguchi, Tomoki; Kawabata, Kanako; Kato, Chikage; Yamazaki, Hideya; Yamada, Kei; Aibe, Norihiro (Case Reports in Oncology, 2026)