Source:http://linkedlifedata.com/resource/umls/id/C0278834
NCI: Cancer is found in the prostate only. The cancer (1) is found by needle biopsy or in a small amount of tissue during surgery for other reasons; the prostate-specific antigen (PSA) level is lower than 10 and the Gleason score is 6 or lower; or (2) is found in one-half or less of one lobe of the prostate; the PSA level is lower than 10 and the Gleason score is 6 or lower; or (3) cannot be felt during a digital rectal exam and is not visible by imaging; cancer is found in one-half or less of one lobe of the prostate and the PSA level and Gleason score are not known.,NCI: Stage I includes: T1, N0, M0, G1. T1: Tumor invades subepithelial connective tissue. N0: No regional metastasis. M0: No distant metastasis. G1: Well differentiated (slight anaplasia) (Gleason 2-4). (AJCC 6th ed.) - 2003