Over time, the majority of seropositive patients in clinical trials demonstrated either a downward trend in titers (based on a ≥ 4-fold reduction in titer from the peak measurement to the last measurement) (40% of the patients), tolerised (no detectable antibodies confirmed by 2 consecutive radioimmunoprecipitation (RIP) assays) (14% of the patients) or demonstrated a plateau (35% of the patients).