TNM Staging Scheme of Ellison et al for Gastrinoma

Ellison et al proposed a TNM (Tumor, Node, Metastases) staging scheme for gastrinoma. The authors are from the Ohio State University in Columbus.

Parameters:

(1) diameter of the primary tumor

(2) lymph node metastases

(3) distant metastases

Parameter	Finding	Code
diameter	primary not found on imaging or at surgery	T0
	<= 1.0 cm	T1
	1.1 to 2.0 cm	T2
	2.1 to 2.9 cm	T3
	>= 3.0 cm	T4
lymph nodes	none	N0
	present	N1
	cannot be assessed	Nx
distant metastases	none	M0
	present	M1
	cannot be assessed	Mx

where:

• The scheme does not cover T0N1MX. In the implementation this is staged as I.

from Figure 3, page 899

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