I am an RN in the USA; have a biopsy, blood work, symptom diagnosis of GCA & PMR since late 2/2017. The article I'm referencing is considered scholarly. So, it maybe difficult to understand. What was a surprise to me is that there are chemical cytokines which are found in GCA that cause inflammation & they are NOT suppressed by glucocorticoids ( the steroids we take). The article found this Rheumatoid Arthritis drug Tofacitinib, did stop the "over growth inside the artery walls" that occur in GCA.
This article was on a link to the American Heart Association Professional site. The title is "Inhibition of JAK-STAT Signaling Suppresses Pathogenic Immune Responses in Medium and Large Vessel Vasculitis".
When I spoke with my internist about this recently, he said that's why we have you on aspirin & will add a statin. I said no way will I take a statin. Seems if we're not blinded by GCA, my Rheum & Internist are content with smoldering inflammation affecting the inside of my arteries.