PIK3C2A and hypophosphatemia: Comparing patients with and without CPK elevation, we did not find differences in terms of hypophosphatemia (0.93 ± 0.26 in the group with CPK elevation versus 1.04 ± 0.27 in the group without CPK elevation, P = 0.5) and fractional excretion of phosphate (resp., 17 ± 3.5% versus 14.8 ± 10%, P = 0.48).