Birol A, Kisa U, Kurtipek GS, Kara F, Kocak M, Erkek E, Caglayan O:Increased tumor necrosis factor alpha (TNF-alpha) and interleukin 1 alpha (IL1-alpha) levels in the lesional skin of patients with nonsegmental vitiligo.Int J Dermatol. 2006, 8:992-3. Here, TNF is linked to vitiligo.