John H. Stone MD, MPH. Professor of Medicine, Harvard Medical School. The Edward A. Fox Chair in Medicine, Massachusetts General Hospital, Boston, MA, USA.

He writes: I have had a career-long interest in teaching, research, and clinical care of patients with rheumatic diseases; i.e., inflammatory diseases mediated by patients' overly active immune systems. My work has focused on the systemic vasculitides, particularly ANCA-associated vasculitis and giant cell arteritis; IgG4-related disease (IgG4-RD); and glucocorticoid toxicity. Following medical school at Harvard Medical School, internal medicine training at Johns Hopkins, and a rheumatology fellowship at the University of California-San Francisco, I co-founded and directed the Vasculitis Center at Johns Hopkins University. This Center was the first in the United States to focus on inflammatory diseases of blood vessels such as ANCA-associated vasculitis and giant cell arteritis.

At JohnsHopkins, I directed the first NIH-funded, multi-center clinical trial in granulomatosis with polyangiitis. The results of this trial were published in The New England Journal of Medicine (2005). This trial paved the way for subsequent trials and investigations in vasculitis on an international scale. Work at the Johns Hopkins Vasculitis Center blazed a path for physicians all over the world interested in vasculitis, encouraging them to focus on research in this area. This effort ultimately served as the impetus for dozens of clinical trials in these diseases that have led to substantially better treatments for patients in less than 20 years.

I have also been the global Principal Investigator of a multi-center clinical trial of interleukin-6 receptor (IL6R) blockade in giant cell arteritis. Giant cell arteritis is a disease that currently affects 300,000 Americans, and aside from prednisone there had been no other effective therapy known for nearly seventy years. The trial, known as GiACTA. This trial, conducted at 76 sites across North America and Europe, ledto a "breakthrough designation" for tocilizumab by the FDA for giant cell arteritis and approval by the agency in 2017. The drug has also been approved in Europe for giant cell arteritis, and in Japan it is approved for Takayasu's arteritis, a related form of vasculitis, as well - all on the strength of this one trial. The primary results of this trial were published in The New England Journal of Medicine (2017). The trial demonstrated for the first time ever the availability of an effective steroid-sparing approach to the treatment of giant cell arteritis.

My second major research interest pertains to an emerging disease, IgG4-RD. My group at the MGH has identified several new disease associations with IgG4-RD, including lymphoplasmacytic thoracic aortitis, eosinophilic angiocentric fibrosis, Riedel's thyroiditis, and midline destructive disease. My group also made the novel observation that B cell depletion with rituximab leads to swift, targeted declines in serumIgG4 concentrations (the other IgG subclasses remain stable), associated with dramatic clinical improvement. I was the first author on an NEJM Mechanisms of Disease paper in 2012 entitled "IgG4-Related Disease" and the senior author on a Lancet review (2014). I was the Principal Investigator on an NIH-funded R13 grant to conduct the world's first International Symposium on IgG4-RD (2011). Three subsequent international symposia on IgG4-RD have followed, and a fifth is planned.

Finally, a burgeoning research interest in the last couple of years pertains to the measurement and prevention of steroid toxicity. Steroids remain the cornerstone of treating many immune-mediated diseases, but their toxicities are well-known and generally reviled by physicians and patients alike. I organized an international group of sub-specialty experts to create a Glucocorticoid Toxicity Index (GTI), designed for use as an outcome measurein clinical trials. We have created a version of this instrument designed for use in adult patients that has now been licensed for use in clinical trials across twenty disease indications. A pediatric version of the instrument has also been developed, and both instruments are available on digital platforms.

One of the career achievements of which I am most proud, however, is A Clinician's Pearls & Myths in Rheumatology, now in its second edition. This book involves a collaboration of more than 200 international experts who share their insights about this remarkable specialty of ours.

Over the span of my career, I have had the privilege of witnessing and in some cases helping in the transition of treatment for patients with inflammatory diseases - rheumatoid arthritis, lupus, vasculitis, IgG4-RD, and many more - out of the Dark Ages of limited therapeutic options with toxic side-effects, into an era of safe, highly effective medications. We have made great progress thus far, and I anticipate an acceleration of the pace between now and the third edition of A Clinician's Pearls & Myths.