C3 and acute promyelocytic leukemia: ANA: antinuclear antibody; ANCA: antineutrophil cytoplasmic antibodies; APL: antiphospholipid antibodies; RhF: rheumatoid factor; C3/C4: complement components C3 and C4; Anti-CCP: anti-cyclic citrullinated peptide; TSH: thyroid-stimulating hormone; T4: thyroxine; Anti-TPO: antithyroid peroxidase; AChR: acetylcholine receptor