PRF1 and systemic lupus erythematosus: SLE patients had significantly elevated transcript levels of ITGAL (18.61±22.17 vs. 7.33±9.17, p = 0.042), PRF1 (21.67±26.34 vs. 10.67±11.65, p = 0.039), and CD70 (1.45±1.63 vs. 0.67±0.28, p = 0.011).