PRDM1 and hematocrit: In HT patients, residual thyroid volume was negatively associated with increase in T-bet (ρ = −0.417, P = 0.02, n = 32, Figure 3A) and BLIMP1 mRNA transcript levels (ρ = −0.389, P = 0.03, n = 32, Figure 3B) of PB T cells, particularly in euthyroid (euHT + substHT) cases [ρ(T-bet) = −0.483, P = 0.027; ρ(BLIMP1) = −0.558, P = 0.0085].