Clinical T

This input is used for staging

Notes

**Note 1:** Intraluminal or intramural extension to esophagus and duodenum is classified by the depth of greatest invasion in any of these sites, including stomach. * For extension to esophagus or duodenum via serosa, assign T4b **Note 2:** Assign T2 If the diagnosis states linitis plastica and no other information regarding extension is available. * Linitis plastica is defined as diffuse involvement of the entire thickness of the stomach wall **Note 3:** Assign T4b for contiguous extension from the site of origin. Discontinuous involvement is coded in M (distant metastasis). * *Exception*: Assign T1 for implants within the stomach

NAACCR Item

NAACCR #940

Clinical T	Clinical T Display	Description	Registrar Notes
cX	cTX	Primary tumor cannot be assessed	Clinical classification criteria met, evaluation done: Physician unable to assess T Extension cannot be determined Physician assigns cTX, no other information available to determine T
c0	cT0	No evidence of primary tumor
pIS	pTis	Carcinoma in situ: intraepithelial tumor without invasion of the lamina propria High grade dysplasia	Noninvasive (Adeno)carcinoma, noninvasive, in a polyp Stated as Tis
c1	cT1	Tumor invades lamina propria, muscularis mucosae, or submucosa	Note: T1 has subcategories of T1a and T1b. Assign T1 only when there is no information available to assign one of the subcategories Confined to: Head of polyp, NOS Stalk of polyp, NOS Invasive tumor in polyp, NOS Implants inside stomach Localized, NOS Stated as T1 [NOS]
c1A	cT1a	Tumor invades lamina propria or muscularis mucosae	Invasive tumor confined to mucosa, NOS, including intramucosal, NOS Mucosal tumor with intraluminal extension to esophagus or duodenum Stated as T1a
c1B	cT1b	Tumor invades submucosa	Superficial invasion of submucosa Submucosal tumor with intraluminal extension to esophagus or duodenum Stated as T1b
c2	cT2	Tumor invades muscularis propria	Invades into but not through muscularis propria Linitis plastica and no other information regarding extension available Invasion of muscularis propria with intraluminal extension to esophagus or duodenum Stated as T2
c3	cT3	Tumor invades subserosa	Extension through wall, NOS Invasion through muscularis propria or muscularis, NOS Perimuscular tissue invaded Subserosal tissue/(sub)serosal fat invaded Invasion through muscularis propria with intraluminal extension to esophagus or duodenum 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 Stated as T3
c4	cT4	Tumor perforates serosa OR Invades adjacent structures	Note: T4 has subcategories of T4a and T4b. Assign T4 only when there is no information available to assign one of the subcategories Stated as T4 [NOS]
c4A	cT4a	Tumor perforates serosa	Invasion of/through serosa (mesothelium) (tunica serosa) (visceral peritoneum), including perforation of visceral peritoneum covering the gastric ligaments or the omentum Stated as T4a
c4B	cT4b	Tumor invades adjacent structures	Adjacent structures include: Abdominal wall Adrenal (suprarenal) gland Aorta Celiac axis Diaphragm Duodenum via serosa Duodenum, NOS Esophagus via serosa Ileum Jejunum Kidney Liver Pancreas Retroperitoneum Small intestine, NOS Spleen Transverse colon/mesocolon (including flexures) Further contiguous extension Stated as T4b
88	88	Not applicable	Primary site/histology not TNM defined Death certificate only (DCO) case
<BLANK>	BLANK	See Registrar Notes	Clinical classification criteria not met Clinical classification criteria met, evaluation done: No information about diagnostic workup Results not documented in record Clinical evaluation of primary tumor not done or unknown if done Tumor first detected on surgical resection (no clinical workup) Evidence of metastatic disease [(cM1) or (pM1)], no other workup Only Clinical Stage Group documented (no T, N, or M information available)