Table 1. Definition of the proposed classification of peritoneal tumor spread behavior.

Spread type	Peritoneum	Size	Lymph Nodes1	Code
Miliary (M)	> 20 implants	most of them < 2 cm	pNX, pN0, or pN1	2
Non-miliary (nM)	no implants/few implants	> 2 cm	pN1/pNX, pN0, or pN1	0/1
Indeterminable (due to late stage)	widespread, high tumor load	>> 2 cm or adnate	pNX, pN0, or pN1

¹pN0 = no regional lymph node metastasis, pN1 = regional lymph node metastasis, pNX = regional lymph nodes not assessed