Can the plasma PD-1 levels predict the presence and efficiency of tumor-infiltrating lymphocytes in patients with metastatic melanoma?
- Autori: Incorvaia, L.; Badalamenti, G.; Rinaldi, G.; Iovanna, J.; Olive, D.; Swayden, M.; Terruso, L.; Vincenzi, B.; Fulfaro, F.; Bazan, V.; Russo, A.; Fanale, D.
- Anno di pubblicazione: 2019
- Tipologia: Articolo in rivista
- Parole Chiave: brisk TILs; immune response; melanoma; plasma PD-1; plasma PD-L1; tumor-infiltrating lymphocytes
- OA Link: http://hdl.handle.net/10447/383830
Background: The immune response in melanoma patients is locally affected by presence of tumor-infiltrating lymphocytes (TILs), generally divided into brisk, nonbrisk, and absent. Several studies have shown that a greater presence of TILs, especially brisk, in primary melanoma is associated with a better prognosis and higher survival rate. Patients and Methods: We investigated by enzyme-linked immunosorbent assay (ELISA) the correlation between PD-1 levels in plasma and the presence/absence of TILs in 28 patients with metastatic melanoma. Results: Low plasma PD-1 levels were correlated with brisk TILs in primary melanoma, whereas intermediate values correlated with the nonbrisk TILs, and high PD-1 levels with absent TILs. Although the low number of samples did not allow us to obtain a statistically significant correlation between the plasma PD-1 levels and the patients' overall survival depending on the absence/presence of TILs, the median survival of patients having brisk type TILs was 5 months higher than that of patients with absent and nonbrisk TILs. Conclusions: This work highlights the ability of measuring the plasma PD-1 levels in order to predict the prognosis of patients with untreated metastatic melanoma without a BRAF mutation at the time of diagnosis.