Conversely, tumour necrosis factors (TNF)‐α and ‐β,41, 44IFNγ,44 stromal‐derived factor 1 (SDF1), cyclin dependent kinase inhibitor 1A (CDKN1A),59 C‐C chemokine receptor type 5 (CCR5)41 and caspase 8 (CASP8)57 have been investigated in relation to KS and KSHV but have not yielded statistically significant results. Here, CASP8 is linked to Kaposi's sarcoma.