Regarding the sensitivities in the particular groups of tested drugs, IFNg-ELISpot appeared to have sensitivities from 42% (abacavir) to 64% (allopurinol/oxpurinol) in DRESS, and up to 67% (allopurinol/oxpurinol) in SJS/TEN (Table 3 and Table 6). This evidence concerns the gene IFNG and toxic epidermal necrolysis.