RT Book, Section A1 Spigel, David R. A1 Greco, F. Anthony A2 Boyiadzis, Michael M. A2 Fojo, Tito SR Print(0) ID 1187880839 T1 Carcinoma of Unknown Primary T2 Hematology-Oncology Therapy, 3e YR 2022 FD 2022 PB McGraw-Hill Education PP New York, NY SN 9781260117400 LK hemonc.mhmedical.com/content.aspx?aid=1187880839 RD 2024/04/20 AB EpidemiologyTable Graphic Jump Location|Download (.pdf)|PrintEpidemiologyIncidence:Unknown✫ (Estimated at 30,000–45,000 patients/year)Stage at PresentationMedian age:Varies by histology (usually sixth decade)Local/regional:90%✫Due to patient heterogeneity and tumor registry misclassification American Cancer Society. Cancer Facts & Figures 2013 Greco FA, Hainsworth JD. In: DeVita VT Jr et al, editors. Cancer: Principles & Practice of Oncology, 10th ed. Philadelphia: Wolters Kluwer; 2015:1720–1737Hainsworth JD et al. J Clin Oncol 1991;9:1931–1938Hainsworth JD, Greco FA. N Engl J Med 1993;329:257–263