%0 Journal Article %T Immune checkpoint inhibitor PD-1 pathway is down-regulated in synovium at various stages of rheumatoid arthritis disease progression %A Alice M. Walsh %A Brittney Scott %A Carl Orr %A Costantino Pitzalis %A Douglas J. Veale %A Frances Humby %A Ian Anderson %A Joshua R. Friedman %A Loui Madakamutil %A Malcolm D. Smith %A Mary Canavan %A Mathew Loza %A Michele Bombardieri %A Mihir D. Wechalekar %A Sunil Nagpal %A Susanna M. Proudman %A Suzanne Cole %A Trudy McGarry %A Ursula Fearon %A Xuefeng Yin %A Yanxia Guo %J Archive of "PLoS ONE". %D 2018 %R 10.1371/journal.pone.0192704 %U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5831027/