According to the AJCC 8th edition staging system for cutaneous melanoma, a primary tumour measuring 0.7 mm Breslow thickness without ulceration is classified as:
- A Tis
- B T1a ✓
- C T1b
- D T2a
Correct answer: B. T1a
Explanation
In the AJCC 8th edition, T1 includes tumours up to 1.0 mm. Tumours under 0.8 mm without ulceration are T1a, while T1b comprises tumours under 0.8 mm with ulceration or those 0.8 to 1.0 mm with or without ulceration. Importantly, mitotic rate was removed as a T1 criterion in the 8th edition, having been used previously, so it does not alter this classification.
Reference: Rook's Textbook of Dermatology, 9th ed.
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