CD19 and diabetes mellitus: Patients with a history of SIE were significantly older (63.6 ± 18.8 vs 48.8 ± 16.7; p = 0.0091), suffered most frequently of diabetes mellitus (33.3 % vs 5.3 %, p = 0.015), had a lower CD19 count (1.0 ± 1.2/mm3 vs 3.9 ± 7.2/mm3) and had most frequently a prednisone dose >15 mg/day (91.7 % vs 47.7 %) at the start of the first RTX course.