Clinical T

This input is used for staging


**Note 1:** High grade dysplasia and severe dysplasia of the colon are generally not reportable in cancer registries. * Assign pTis if your registry collects these tumors **Note 2:** In situ includes cancer cells confined within the glandular basement membrane (intraepithelial); localized includes confined to lamina propria (intramucosal), the muscular mucosa, and muscularis propria. **Note 3:** Ignore intraluminal extension to adjacent segment(s) of colon/rectum or to the ileum from the cecum; code depth of invasion or extracolonic spread as indicated. **Note 4:** Direct invasion in cT4b includes invasion of other organs or segments of the colorectum by way of the serosa, as confirmed on microscopic examination, or for tumors in a retroperitoneal or subperitoneal location, direct invasion of other organs or structures by virtue of extension beyond the muscularis propria. **Note 5:** Tumor that is adherent to other organs or structures, macroscopically, is classified T4b. However, if no tumor is present in the adhesion, microscopically, the classification should be pT1 - pT3. **Note 6:** Assign T4b for contiguous extension from the site of origin. Discontinuous involvement is coded in M (distant metastasis).


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 No evidence of primary tumor
pIS pTis Carcinoma in situ: intraepithelial or invasion of lamina propria (Adeno)carcinoma, noninvasive, in a polyp or adenoma

Invasive tumor confined to:
Lamina propria, including lamina propria in the stalk of a polyp
Mucosa, NOS, including intramucosal, NOS
Muscularis mucosae (but not through), including muscularis mucosae in the stalk of a polyp

Stated as Tis
c1 cT1 Tumor invades submucosa Confined to:
Head of polyp, NOS
Stalk of polyp, NOS

Invasive tumor in polyp, NOS

Invades submucosa (superficial invasion), including submucosa in the head or stalk of polyp

Confined to colon, NOS
Localized, NOS

Stated as T1
c2 cT2 Tumor invades muscularis propria Stated as T2
c3 cT3 Tumor invades subserosa or into non-peritionealized pericolic or perirectal tissues Extension through wall, NOS
Invasion through muscularis propria or muscularis, NOS
Non-peritonealized pericolic tissues invaded
Perimuscular tissue invaded
Subserosal tissue/(sub)serosal fat invaded
Transmural, NOS
Wall, NOS

Extension to:
All colon sites:
Adjacent tissue(s), NOS
Connective tissue
Mesenteric fat
Pericolic fat
Ascending and descending colon
Retroperitoneal fat
Transverse colon and flexures
Gastrocolic ligament
Greater omentum

Fat, NOS

Stated as T3
c4 cT4 Tumor perforates visceral peritoneum and/or directly invades other organs or 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 visceral peritoneum Invasion of/through serosa (mesothelium) (visceral peritoneum)
Tumor penetrates to surface of visceral peritoneum

Stated as T4a
c4B cT4b Tumor directly invades other organs or structures Adherent to other organs or structures clinically with no microscopic examination
Tumor found in adhesion(s) if microscopic examination performed
(see Note 5)

Contiguous extension to:

All colon sites:
Abdominal wall
Adrenal (suprarenal) gland
Fallopian tube
Fistula to skin
Other segment(s) of colon via serosa
Small intestine

Cecum (C180):
Greater omentum

Ascending colon (C182):
Greater omentum
Liver, right lobe
Right kidney
Right ureter

Transverse colon and flexures (C183, C184, C185):
Gallbladder/bile ducts

Descending colon (C186):
Greater omentum
Left kidney
Left ureter
Pelvic wall

Sigmoid colon (C187):
Cul de sac (rectouterine pouch)
Greater omentum
Pelvic wall

Stated as T4b (all colon subsites)
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)
\# T4 [NOS] is not defined in AJCC 7th edition.