SEER Inquiry System - Question 20031165 Details

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Produced: 09/13/2025 10:39 PM

Question 20031165

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Inquiry Details

References:

#1: SEER EOD-88,3rd Ed, 52. January 1998

#2: AJCC Cancer Staging Manual, 114-115. 6th Edition

Question:

Behavior Code/EOD-Extension--Colon: Are extension codes 10 [Mucosa, NOS (incl. Intramucosal, NOS)] and 11 [Lamina propria] in situ, in accordance with AJCC stage for this site?

Discussion:

Answer:

For cases diagnosed 1998-2003: EOD codes 10 and 11 are invasive. SEER, to be compatible with Summary Stage 77 and 2000, calls EOD extension codes 10 and 11 invasive because invasion of the lamina propria is invasion through the lamina propria/basement membrane and therefore invasive.

According to AJCC, the survivial rates for tumors that invade only the mucosa or lamina propria are similar to Tis tumors, so the AJCC classifies them as Tis.

Cancer Site Category:

Colon

Data Item Category:

Behavior

Other Category:

N/A

Year:

2003