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Signalment, tumor type, treatment protocol, tumor control duration, and survival were recorded. Kaplan-Meier survival curves were generated for overall survival (OS), by tumor type and location, and compared using Log-rank tests, and treatment protocol adherence.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Follow-up ranged from 2 to 145\u2009months (median 14\u2009months). Of 32 horses, 16 (50%) were alive at the time of reporting, with complete tumor response occurring in 12 (38%). Horses with tumors of the maxilla\/nasal cavity had significantly shorter median OS compared to horses with tumors in other locations (21\u2009months vs 145\u2009months) (P = .06). Adverse effects resulting from the tumor or the therapy occurred in 20\/32 (63%). The occurrence of major adverse effects and delays in treatment protocol were not significantly associated with median survival estimates.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions and Clinical Importance<\/jats:title>\n                    <jats:p>External beam radiotherapy can be used to treat a variety of noncutaneous tumors of the head of horses. Adverse effects related to radiotherapy or the tumor are common.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/jvim.15954","type":"journal-article","created":{"date-parts":[[2020,11,9]],"date-time":"2020-11-09T09:05:17Z","timestamp":1604912717000},"page":"2808-2816","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Outcome of external beam radiotherapy for treatment of noncutaneous tumors of the head in horses: 32 cases (1999-2015)"],"prefix":"10.1093","volume":"34","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2291-6389","authenticated-orcid":false,"given":"Alex","family":"Gillen","sequence":"first","affiliation":[{"name":"Auburn University Department Veterinary Clinical Sciences, , Auburn, Alabama,","place":["USA"]},{"name":"Alex Gillen, The Philip Leverhulme Equine Hospital , Cheshire,","place":["United Kingdom"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0104-9714","authenticated-orcid":false,"given":"Margaret","family":"Mudge","sequence":"additional","affiliation":[{"name":"The Ohio State University Department of Veterinary Clinical Sciences, , Columbus, Ohio,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fred","family":"Caldwell","sequence":"additional","affiliation":[{"name":"Auburn University Department Veterinary Clinical Sciences, , Auburn, Alabama,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9922-2129","authenticated-orcid":false,"given":"Amelia","family":"Munsterman","sequence":"additional","affiliation":[{"name":"Auburn University Department Veterinary Clinical Sciences, , Auburn, Alabama,","place":["USA"]},{"name":"The Ohio State University Department of Veterinary Clinical Sciences, , Columbus, Ohio,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Reid","family":"Hanson","sequence":"additional","affiliation":[{"name":"Auburn University Department Veterinary Clinical Sciences, , Auburn, Alabama,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"William","family":"Brawner","sequence":"additional","affiliation":[{"name":"Auburn University Department Veterinary Clinical Sciences, , Auburn, Alabama,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gregory","family":"Almond","sequence":"additional","affiliation":[{"name":"Auburn University Department Veterinary Clinical Sciences, , Auburn, Alabama,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eric","family":"Green","sequence":"additional","affiliation":[{"name":"The Ohio State University Department of Veterinary Clinical Sciences, , Columbus, Ohio,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Julie","family":"Stephens","sequence":"additional","affiliation":[{"name":"Center for Biostatistics , Department of Biomedical Informatics, College of Medicine, The Ohio State University, Columbus, Ohio,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jillian","family":"Walz","sequence":"additional","affiliation":[{"name":"The Ohio State University Department of Veterinary Clinical Sciences, , Columbus, Ohio,","place":["USA"]},{"name":"Jillian Walz, MSPCA-Angell Animal Medical Center , Boston, MA,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2020,11,1]]},"reference":[{"issue":"6","key":"2026020922122391900_jvim15954-bib-0001","doi-asserted-by":"crossref","first-page":"261","DOI":"10.1053\/tvjl.1998.0370","article-title":"Equine nasal and paranasal sinus tumors. 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