The following stage variables are coded only for 1988-2003 cases. They are derived by algorithm from extent of disease (EOD) and not available for all years or for all sites.

  1. AJCC stage 3rd edition (1988-2003)
  2. SEER modified AJCC stage 3rd (1988-2003) - The modified version stages cases that would be unstaged under strict AJCC staging rules. For example, it assumes NX is N0.
  3. T value - based on AJCC 3rd (1988-2003)
  4. N value - based on AJCC 3rd (1988-2003)
  5. M value - based on AJCC 3rd (1988-2003)

Each variable is coded for cases with the following ICD-O codes

Cancer Site ICD-O Code
Colon C180:C189
Rectum C199,C209
Lung and Bronchus C340:C349
Breast C500:C509
Cervix C530:C539
Corpus Uteri C540:C548, C559
Ovary C569
Vagina C529
Vulva C510:C512, C518, C519
Prostate C619
Bladder C670:C679

For staging criteria, refer to https://seer.cancer.gov/archive/manuals/historic/comp_stage1.1.pdf (PDF, 3.1 MB)

Codes for AJCC stage 3rd edition (1988-2003) and SEER modified AJCC stage 3rd (1988-2003)

Code Stage
0 In situ
10 I
11 IA
12 IB
13 IC
18 In Situ and I combined for bladder only
19 I, NOS
20 II
21 IIA
22 IIB
23 IIC
29 II, NOS
30 III
31 IIIA
32 IIIB
33 IIIC
39 III, NOS
40 IV
41 IVA
42 IVB
49 IV, NOS
88 Recode scheme not yet available
90 Unstaged
98 Not applicable
99 Error condition

Codes for T value - based on AJCC 3rd (1988-2003)

Code T Value
00 Tis
01 Ta
10 T1
11 T1a
12 T1b
13 T1c
16 T1a1
17 T1a2
19 T1x
20 T2
21 T2a
22 T2b
23 T2c
29 T2x
30 T3
31 T3a
32 T3b
33 T3c
39 T3x
40 T4
41 T4a
42 T4b
43 T4c
44 T4d
49 T4x
70 T0
71 T0a
72 T0b
81 TXa
82 TXb
83 TXc
84 TXd
99 TX

Codes for N value - based on AJCC 3rd (1988-2003)

Code N Value
00 N0
10 N1
11 N1a
12 N1b
19 N1x
20 N2
21 N2a
22 N2b
23 N2c
30 N3
70 NXr
80 NXu
99 NX

Codes for M value - based on AJCC 3rd (1988-2003)

Code M Value
00 M0
10 M1
99 MX
11 M1a
12 M1b