Clinical T

This input is used for staging

Notes

**Note 1:** In addition to the depth of invasion, a Clark's level may be assigned by the pathologist. If there is a discrepancy between the Clark's level and the pathologic description of extent (invasion into the layers of the dermis), assign the higher T. **Note 2:** Code the greatest extent of invasion from any procedure performed on the lesion, whether it is described as a biopsy or an excision. **Note 3:** Satellite lesions/nodules or in-transit metastases are coded in regional lymph nodes. **Note 4:** Breslow's depth is coded in **Site-Specific Factor 1, Measured Thickness (Depth), Breslow Measurement.** **Note 5:** Ulceration of the melanoma is coded in **Site-Specific Factor 2, Ulceration.**

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
Depth unknown for T categories
Physician assigns cTX, no other information available to determine T
c0 cT0 No evidence of primary tumor
pIS pTis Melanoma in situ (Clark Level I)
Atypical melanocytic hyperplasia
Several melanocytic dysplasia
Not an invasive malignant lesion
Intraepidermal, intraepithelial, noninvasive
(Basement membrane of the epidermis is intact)

Stated as Tis
c1 cT1 Tumor 1 mm or less in thickness Note: T1 has subcategories of T1a and T1b. Assign T1 only when there is no information available to assign one of the subcategories

Skin/dermis, NOS
Localized, NOS

Stated as T1 [NOS]
c1A cT1a without ulceration and mitosis less than 1mm (squared)^ Clarks levels II-V WITHOUT ulceration

Papillary dermis invaded WITHOUT ulceration or UNKNOWN if ulceration
Papillary-reticular dermal interface invaded WITHOUT ulceration or UNKNOWN if ulceration

Reticular dermis invaded WITHOUT ulceration or UNKNOWN if ulceration

Subcutaneous tissue invaded (through entire dermis) WITHOUT ulceration or UNKNOWN if ulceration

Stated as T1a

Note: Depth of invasion (breslow's depth) has priority over any other information
c1B cT1b with ulceration or mitoses equal to or greater than 1mm (squared)^ Clarks levels II-V WITH ulceration

Papillary dermis invaded WITH ulceration
Papillary-reticular dermal interface invaded WITH ulceration

Reticular dermis invaded WITH ulceration

Subcutaneous tissue invaded (through entire dermis) WITH ulceration

Stated as T1b

Note: Depth of invasion (breslow's depth) has priority over any other information.
c2 cT2 Tumor more than 1 mm but not more than 2 mm in thickness Note: T2 has subcategories of T2a and T2b. Assign T2 only when there is no information available to assign one of the subcategories

Stated as T2 [NOS]
c2A cT2a without ulceration Stated as T2a
c2B cT2b with ulceration Stated as T2b
c3 cT3 Tumor more than 2 mm but not more than 4 mm in thickness Note: T3 has subcategories of T3a and T3b. Assign T3 only when there is no information available to assign one of the subcategories

Stated as T3 [NOS]
c3A cT3a without ulceration Stated as T3a
c3B cT3b with ulceration Stated as T3b
c4 cT4 Tumor more than 4 mm in thickness 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 without ulceration Further contiguous extension:
Underlying cartilage, bone, skeletal muscle WITHOUT ulceration

Stated as T4a
c4B cT4b with ulceration Further contiguous extension:
Underlying cartilage, bone, skeletal muscle WITH ulceration

Stated as T4b
88 88 Not applicable 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)
^ Definition from the updated pages from [TNM Classification of Malignant Tumours, Seventh edition](http://www.wileyanduicc.com/pdf/Corrected_pages.pdf)