Rheumatoid arthritis (RA) is a chronic autoimmune disease; deferment and relapse of aggressive synovitis finally leads to destruction of joint cartilage and bone, and that is the main hazard of the disease. In recent years, biologic reagents have become a hot spot of RA treatment research, owing to their higher specificity and fewer side effects than existing non-biologic disease-modifying and anti-inflammatory drugs. 

The Editor,

Sir,

Thyroid cancers (TC) are malignant neoplasms originating from follicular or parafollicular thyroid cells, with five-year relative survival of approximately 85% in Europe. Current incidence of TC is 14.3 per 100 000 individuals in the United States of America [USA].