Defining high-risk patients: beyond the 8the AJCC melanoma staging system

Since melanoma incidence is steadily increasing, guidelines regarding the diagnosis, staging, and treatment of melanoma are constantly being updated. In particular, the use of adjuvant therapy in stage IIb/c melanoma has been recently approved by the international regulatory agenicies. We performed a retrospective study with 92 melanoma patients namely 42 patients with IIb/c melanoma and 42 patients with IIIa stage melanoma, describing demographics, clinical, histology and disease course during the 5-year follow-up.

Several significant evidences emerged between the two groups. Stage IIb/c patients possess a higher age of disease onset (69.6 vs. 55.5 years) with respect to stage III patients and the acral localization appeared as the most frequent (24% vs. 4%). Histologically, stage IIb/c melanomas more frequently exhibit ulceration (70% vs. 2%), angiotropism (54% vs. 8%) and are characterized by a greater presence of TILS (52% vs. 15%). Although it is not statistically significant, we observed a difference in terms of presence of metastasis during the 5-year follow-up: 15% of stage IIb/c patients showed metastasis vs. 4% of stage IIIa patients. Our data support the use of adiuvant immunotherapy in stage IIb/c patients.