Stage I includes: T1, N0, M0. T1: For male penile urethra and female urethra: Tumor invades subepithelial connective tissue. For prostatic urethra: Tumor invades urethral subepithelial connective tissue immediately underlying the urothelium. N0: No regional lymph node metastasis. M0: No distant metastasis. (AJCC 8th ed.) [from
NCI]