NCIt definition : A general term that refers to a TNM finding of a primary tumor limited to the site
of growth. The definition of T1a TNM finding depends on the specific type of cancer
that it refers to; for example, for breast cancer it refers to a primary tumor that
is more than 0.1cm, but not more than 0.5 cm in greatest dimension; for kidney cancer
it refers to a primary tumor that is 4 cm or less in greatest dimension; and for thyroid
cancer it refers to a primary tumor that is 1 cm or less in greatest dimension.;