TNF and systemic lupus erythematosus: Considering anemia, the group of SLE-a patients showed a strong correlation of RDW with serum IL-6 (r = 0.894, p < 0.001) in addition to PLR with TNF (r = 0.743, p < 0.025) and an inverse correlation with C3 complement (r = 0.538, p < 0.05).