Rheumatoid arthritis risk allele PTPRC is also associated with response to anti-tumor necrosis factor alpha therapy.

Cui J, Saevarsdottir S, Thomson B, Padyukov L, van der Helm-van Mil AHM, Nititham J, Hughes LB, de Vries N, Raychaudhuri S, Alfredsson L, Askling J, Wedren S, Ding B, Guiducci C, Wolbink GJ, Crusius JBA, van der Horst-Bruinsma IE, Herenius M, Weinblatt ME, Shadick NA, Worthington J, Batliwalla F, Kern M, Morgan AW, Wilson AG, Isaacs JD, Hyrich K, Seldin MF, Moreland LW, Behrens TW, Allaart CF, Criswell LA, Huizinga TWJ, Tak PP, Bridges SL, Jr., Toes REM, Barton A, Klareskog L, Gregersen PK, Karlson EW, Plenge RM.
Arthritis & Rheumatism 2010;62(7):1849-61.