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NCI-H660 was originally described as a small cell lung carcinoma [PubMed: 2985257], subsequently it was correctly identified as an extrapulmonary small cell carcinoma originating in the prostate gland [PubMed: 2569043, 7762988]. The line was derived by A. F. Gazdar, H. K. Oie, J. D. Minna and associates from a lymph node metastasis taken from a patient prior to therapy.