PRF1 and melanoma: In accordance with the CD107a mobilization results, intracellular FACS analysis carried out on Vγ9Vδ2 T cells from 4 patients after melanoma removal revealed increased expression of perforin (70.3 ± 8,6% versus 25.3 ± 6.1%) and granzyme B (79.5 ± 10.4% versus 28.7 ± 6.7%).