Withrington R H, Teitsson I, Seifert M H, Valdimarsson H
Ann Rheum Dis. 1984 Jun;43(3):505-7. doi: 10.1136/ard.43.3.505.
A 64-year-old woman with rheumatoid arthritis developed Felty's syndrome. Her serum contained large amounts of IgA rheumatoid factor (RF) but insignificant levels of IgM-RF and IgG-RF. It is postulated that the high levels of IgA-RF may have contributed to the neutropenia.
一名64岁的类风湿关节炎女性患者发展为费尔蒂综合征。她的血清中含有大量IgA类风湿因子（RF），但IgM-RF和IgG-RF水平极低。据推测，高水平的IgA-RF可能导致了中性粒细胞减少。
