PIK3C2A and dermatomyositis: CPK at the initial visit was significantly higher in anti-Mi-2 (+) versus (-) DM patients (mean 5,369 versus 2,860 IU/L, P < 0.0005) (Table 3 and Figure 1B) and this trend was the same when Mexico City DM patients were separately analyzed (4,800 versus 3,502 IU/L, P < 0.01).