Function 
Tumor necrosis factor (TNF) is a cytokine which can cause apoptosis.  TNFα is implicated in tumor regression, septic shock, inflammation and cachexia (wasting syndrome).  It is involved in the regulation of the immune cells[1].  TNFβ is inhibited by interleukin 10.  TNF is a transmembrane homotrimer.  The soluble TNF is produced by cleavage by the metalloprotease TNFα-converting enzyme (TACE or ADAM17 see A Disintegrin And Metalloproteinase).  
  Relevance 
TNF is studied as both a target and a therapeutic in malignant diseases[2].
  Structural highlights 
The biological assembly of human tumor necrosis factor is  (PDB entry 2az5). .