NCIt definition : A general term that refers to a TNM finding of cancer metastases usually in a limited
number of regional lymph nodes. The definition of N1 TNM finding depends on the specific
type of cancer that it refers to; for example, for breast cancer it refers to micrometastases
or metastases in 1-3 axillary lymph nodes; for cutaneous melanoma it refers to metastasis
in 1 regional lymph node; for colorectal cancer it refers to metastases in 1-3 regional
lymph nodes; and for bladder cancer it refers to metastasis in 1 regional lymph node
in the true pelvis.;