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National Cancer Data Base - Data Dictionary PUF 2016

AJCC Clinical Stage Group

PUF Data Item Name: 
NAACCR Item #: 
Allowable values: 
Alphanumeric, Uppercase
Identifies the applicable stage group based on the T, N, and M elements as defined by the American Joint Committee on Cancer (AJCC).
Registry Coding Instructions: 

Refer to the current AJCC Cancer Staging Manual for coding rules.

Analytic Note: 

For cases diagnosed on or prior to December 31, 2003, this item was expected to be completed by an attending physician, though registry staff were frequently involved in the determination of the information coded in this item through the review of the full range of clinical and patient notes available to registry staff. For cases diagnosed January 1, 2004, through December 31, 2007, the CoC required registries to copy the staging items from a standardized document found in the patient record, as recorded by the managing physician. PUF users may notice an increase in the proportion of 99s as a consequence of the CoC restriction on the allowable range of registry coding of information beyond that documented by the managing physician.

The rules changed again with cases diagnosed in 2008. Beginning with 2008 diagnoses, registrars were required to record clinical stage. If it was not available from a physician, it was to be coded from information available in the patient record.

Cases are coded using the AJCC Cancer Staging Manual edition in use during the year in which the case was diagnosed. Consult the appropriate edition of this manual for organ or site specific codes and their definitions. See AJCC TNM Edition Number (NAACCR Item #1060). Prior to implementation of the 5th edition of the manual, some "slippage" in version occurred, and edition numbers are not included in the PUF for those older cases.

Codes on this list comprise all codes valid for any AJCC manual through the 7th edition and for any chapter. Please consult the applicable manual and chapter for codes that are valid for specific site, histology and AJCC edition combinations.

There is no standard mechanism to recode AJCC items from one edition to another. Careful review of the individual definitions in the respective AJCC manuals is necessary before combining or comparing data across two or more AJCC editions.

Code Definition Code cont. Definition cont.
0 cStage 0 2C cStage IIC
0A cStage 0A 3 cStage III
0IS cStage 0is 3A cStage IIIA
1 cStage I 3B cStage IIIB
1A cStage IA 3C cStage IIIC
1A1 cStage IA1 3C1 cStage IIIC1
1A2 cStage IA2 3C2 cStage IIIC2
1B cStage IB 4 cStage IV
1B1 cStage IB1 4A cStage IVA
1B2 cStage IB2 4A1 cStage IVA1
1C cStage IC 4A2 cStage IVA2
IS cStage IS 4B cStage IVB
2 cStage II 4C cStage IVC
2A cStage IIA OC Occult
2A1 cStage IIA1 88 Not applicable
2A2 cStage IIA2 99 Unknown
2B cStage IIB