Collaborative Stage Data Set - Revised 03/28/2013 FINAL

Stomach

CS Site-Specific Factor 1
Clinical Assessment of Regional Lymph Nodes

Note 1: Assessment of clinically evident regional lymph nodes is based on information from the diagnostic workup. This might include: physical examination, imaging, diagnostic lymph node biopsy and exploratory surgery (without a resection).
Note 2: In the rare instance that the number of clinically positive regional nodes is stated but a clinical N category is not stated, use the code that reflects the most specific statement about the number of involved regional nodes.
Note 3: If there is no diagnostic work-up to assess regional lymph nodes, use code 999. Do not apply the inaccessible nodes rule that presumes unmentioned nodes to be negative.

Code	Description
000	Nodes not clinically evident; imaging of regional nodes performed and nodes not mentioned
100	Metastases in 1 - 2 regional lymph nodes, determined clinically Stated as clinical N1
200	Metastases in 3 - 6 regional lymph nodes, determined clinically Stated as clinical N2
300	Metastases in 7 or more regional lymph nodes, NOS, determined clinically Stated as clinical N3 [NOS]
310	Metastases in 7 - 15 regional lymph nodes, determined clinically Stated as clinical N3a
320	Metastases in 16 or more regional lymph nodes, determined clinically Stated as clinical N3b
400	Clinically positive regional node(s), NOS
888	OBSOLETE DATA CONVERTED V0200 See code 988 Not applicable for this site
988	Not applicable: Information not collected for this case (May include cases converted from code 888 used in CSv1 for "Not applicable" or when the item was not collected. If this item is required to derive T, N, M, or any stage, use of code 988 may result in an error.)
999	Regional lymph nodes involved pathologically, clinical assessment not stated Unknown if regional lymph nodes clinically evident Not documented in patient record