Cross-sectional study of 320 dermatomyositis (198 classic DM, 122 amyopathic DM/CADM) & compared myositis panels for ANA, MSA, MAA, etc. Comparing CDM vs CADM - ANA pos in 63% vs 49%, p<0.05; MSA+ 47% vs 40% (NS); MAA+ 29% vs 26%(NS); MSA&MAA neg 40% vs 48% (NS)