Clinical T

This input is used for staging

Notes

**Note 1:** T1 and T2 categories are based on size and high risk features and not depth of invasion or extension. **Note 2:** T3 category is for head and neck skin primaries only. **Note 3:** Code the tumor with the greatest extension when there are multiple simultaneous tumors. **Note 4:** Skin ulceration does not alter the T category. **Note 5:** Tumor size must be known to assign a value of T1 or T2. You may use a physician’s statement of the T category if this is the only information in the medical record. * If the tumor appears to be in the T1 or T2 categories, but no size or category is specified, assign TX **Note 6:** Assign the appropriate T category (T1, T2) based on the tumor size for the following descriptions Lesion(s) confined to dermis Subcutaneous tissue (through entire dermis) Underlying cartilage and/or skeletal muscle Confined to skin Localized, NOS

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
Tumor size (TS) unknown for T categories where TS needed to determine T
Physician assigns cTX, no other information available to determine T
c0 cT0 No evidence of primary tumor
pIS pTis Carcinoma in situ Intraepidermal, intraepithelial, noninvasive
Bowen disease
c1 cT1 Tumor 2 cm or less in greatest dimension
WITH less than two-high risk features
Lesion(s) confined to dermis
Subcutaneous tissue (through entire dermis)
Underlying cartilage and/or skeletal muscle

Stated as T1
c2 cT2 Tumor more than 2 cm in greatest dimension OR
WITH two or more high-risk features
Stated as T2
c3 cT3 Tumor with invasion of deep structures
e.g., muscle, bone, cartilage, jaws, and orbit
For skin of head and neck primaries only:
Maxilla
Mandible
Orbital bone
Temporal bone

Stated as T3
c4 cT4 Tumor with direct or perineural invasion of skull base or axial skeleton For skin of head and neck primaries only:
Direct or perineural invasion of skull base

Axial or appendicular skeleton

Further contiguous extension

Stated as T4
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)