title: Editorial comment.
authors.affiliation: Department of Radiation Oncology, Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA.
authors.forename: Albert J
authors.initials: AJ
authors.lastname: Chang
mesh_terms: D007172:Erectile Dysfunction / Q000209:etiology*; D006801:Humans; D008297:Male; D010413:Penis / Q000528:radiation effects*; D011471:Prostatic Neoplasms / Q000532:radiotherapy*; D020266:Radiotherapy, Conformal / Q000009:adverse effects*