{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,11]],"date-time":"2026-04-11T03:07:09Z","timestamp":1775876829400,"version":"3.50.1"},"reference-count":32,"publisher":"Oxford University Press (OUP)","issue":"55","funder":[{"DOI":"10.13039\/100000002","name":"NIH","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2020,5,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>Cancer treatment studies commonly exclude patients with prior primary cancers due to difficulties in ascertaining for which site treatment is intended. Surveillance, Epidemiology, and End Results-Medicare patients 65\u2009years and older diagnosed with an index colon or rectal cancer (CRC) or female breast cancer (BC) between 2004 and 2013 were included. Chemotherapy, defined as \u201cany chemotherapy\u201d and more restrictively as \u201cchemotherapy with confirmatory diagnoses,\u201d was ascertained based on claims data within 6\u2009months of index cancer diagnosis by prior cancer history. Any chemotherapy use was slightly lower among patients with a prior cancer (CRC: no prior = 17.4%, prior = 16.1%; BC: no prior = 12.9%, prior = 12.0%). With confirmatory diagnoses required, estimates were lower, especially among patients with a prior cancer (CRC: no prior = 16.8%, prior = 13.6%; BC: no prior = 12.6%, prior = 11.0%). These findings suggest that patients with prior cancers can be included in studies of chemotherapy use; requiring confirmatory diagnoses can increase treatment assignment confidence.<\/jats:p>","DOI":"10.1093\/jncimonographs\/lgaa005","type":"journal-article","created":{"date-parts":[[2020,2,3]],"date-time":"2020-02-03T20:10:10Z","timestamp":1580760610000},"page":"14-21","source":"Crossref","is-referenced-by-count":3,"title":["Estimating Chemotherapy Use Among Patients With a Prior Primary Cancer Diagnosis Using SEER-Medicare Data"],"prefix":"10.1093","volume":"2020","author":[{"given":"Clara J K","family":"Lam","sequence":"first","affiliation":[{"name":"Data Analytics Branch, Surveillance Research Program, Division of Cancer Control and Population Sciences, National Cancer Institute, Rockville, MD"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lindsey","family":"Enewold","sequence":"additional","affiliation":[{"name":"Healthcare Assessment Research Branch, Healthcare 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