Overlap with SLE or PM/DM and elevation of creatine phosphokinase (CPK) were common in anti-topo I + U1RNP group (P = 0.009 for SLE, P = 0.07 for CPK, P = 0.05 for PM/DM; Table 1). This evidence concerns the gene SNRNP70 and systemic lupus erythematosus.