TNF and rheumatoid arthritis: Anti-tumour necrosis factor (TNF) monoclonal antibodies (mAb) are prescribed for patients suffering chronic diseases, such as rheumatoid arthritis (RA), ankylosing spondylitis (AS), psoriatic arthritis (PsA), and intestinal bowel diseases (IBD), such as ulcerative colitis (UC) and Crohn’s disease (CD), in both adults and children [1].