CS Extension

Notes

**Note 1**: For this site, AJCC defines Tis as high-grade dysplasia, which includes "all non-invasive neoplastic epithelium that was previously called carcinoma in situ." Cancers stated to be noninvasive or in situ are classified as Tis. High-grade dysplasia is generally not reportable in cancer registries, but if a registry does collect it, code 000 should be used. **Note 2**: Use codes 110, 120, and 160 in preference to code 150 if information about the depth of invasion into the layers of the polyp is available. **Note 3**: Ignore intraluminal extension to adjacent segment(s) of esophagus or to more distal parts of stomach and code depth of invasion or extra-gastric spread as indicated. **Note 4**: If the diagnosis states linitis plastica and no other information regarding extension is available, use code 350. Linitis plastica is defined as diffuse involvement of the entire stomach wall. **Note 5**: Codes 600-700 are used for contiguous extension from the site of origin. Discontinuous involvement is coded in CS Mets at DX, except for implants within the stomach (code 300).
Code Description AJCC 7 T AJCC 6 T Summary Stage 1977 T Summary Stage 2000 T
000 In situ, intraepithelial, non-invasive; high-grade dysplasia Tis Tis IS IS
050 (Adeno)carcinoma, noninvasive, in a polyp Tis Tis IS IS
100 Invasive tumor confined to mucosa, NOS, (including intramucosal, NOS) T1a T1 L L
110 Invades lamina propria T1a T1 L L
120 Invades muscularis mucosae T1a T1 L L
125 Stated as T1a with no other information on extension T1a T1 L L
130 OBSOLETE DATA RETAINED V0200
Cardia/GE Junction (EGJ), and the proximal 5 cm of the fundus and body of the stomach have been moved into this schema from the Stomach schema in CSv2, and the detailed polyp information is not required

Confined to head of polyp
Extension to stalk
ERROR: T1 L L
140 OBSOLETE DATA RETAINED V0200
Cardia/EGJ and the proximal 5 cm of the fundus and body of the stomach have been moved into this schema from Stomach schema in CSv2, and detailed polyp information is not required

Confined to stalk of polyp
ERROR: T1 L L
150 Tumor in polyp NOS T1NOS T1 L L
160 Invades submucosa (superficial invasion)

Stated as T1b with no other information on extension
T1b T1 L L
170 Stated as T1 [NOS] with no other information on extension T1NOS T1 L L
200 Invades into but not through muscularis propria T2 T2a L L
300 Implants inside stomach
Localized, NOS
T1NOS T1 L L
350 Linitis plastica (and no other information regarding extension available)
(See Note 4)
T2 T2a RE L
360 Stated as T2 with no other information on extension T2 T2NOS L L
400 Extension through wall, NOS
Invasion through muscularis propria or muscularis, NOS
Perimuscular tissue invaded
Subserosal tissue/(sub)serosal fat invaded
T3 T2b L L
420 Adventitia and/or soft tissue invaded
Esophagus is described as "FIXED"
T3 T3 RE RE
430 OBSOLETE DATA CONVERTED V0203 See code 480 Stated as T3 [NOS] ERROR: ERROR: ERROR: ERROR:
450 Extension to adjacent (connective) tissue
WITHOUT perforation of visceral peritoneum covering these structures:
Gastric artery
Ligaments:
Gastrocolic
Gastrohepatic
Gastrosplenic
Omentum, NOS
Greater
Lesser
Perigastric fat
T3 T2b RE RE
480 Stated as T3 with no other information on extension T3 T2b L RE
500 Invasion of/through serosa (mesothelium) (tunica serosa) (visceral peritoneum), including perforation of visceral peritoneum covering the gastric ligaments or the omentum WITHOUT invasion of adjacent structures T4a T3 RE RE
550 500 + 450 T4a T3 RE RE
570 Pericardium
Pleura
Diaphragm
T4a T4 RE RE
580 Stated as T4a with no other information on extension T4a T4 RE RE
600 OBSOLETE DATA RETAINED AND REVIEWED V0203
See codes 570, 605, and 615

Diaphragm
Duodenum via serosa or NOS
Esophagus via serosa
Ileum
Jejunum
Liver
Pancreas
Small intestine, NOS
Spleen
Transverse colon (including flexures)
T4a T4 RE RE
605 Duodenum via serosa
Duodenum, NOS
Esophagus via serosa
Ileum
Jejunum
Liver
Pancreas
Small intestine, NOS
Spleen
Transverse colon (including flexures)
T4b T4 RE RE
610 OBSOLETE DATA REVIEWED V0203
See codes 570 and 615

Pleura
Pericardium
T4a T4 RE RE
615 605 + 570 T4b T4 RE RE
700 Abdominal wall
Adrenal gland
Kidney
Retroperitoneum
T4a T4 D D
710 OBSOLETE DATA CONVERTED V0203
See code 810

Stated as T4 [NOS]
ERROR: ERROR: ERROR: ERROR:
720 OBSOLETE DATA CONVERTED V0203
See code 580

Stated as T4a [NOS]
ERROR: ERROR: ERROR: ERROR:
800 Further contiguous extension including but not limited to:
Aorta
Vertebral body
Trachea
Stated as unresectable, NOS
T4b T4 D D
805 Stated as T4b with no other information on extension T4b T4 D D
810 Stated as T4 [NOS] with no other information on extension T4NOS T4 RE RE
820 OBSOLETE DATA CONVERTED V0203
See code 805

Stated as T4b [NOS]
ERROR: ERROR: ERROR: ERROR:
950 No evidence of primary tumor T0 T0 U U
999 Unknown; extension not stated
Primary tumor cannot be assessed
Not documented in patient record
TX TX U U