APOA1 and Hodgkins lymphoma: In relapsed pediatric HL, the more abundant spots were identified as six distinct proteins: apolipoprotein A-I (APOA1), apolipoprotein A-IV (APOA4), clusterin (CLU), haptoglobin (HP), α-1-acid glycoprotein 1 (ORM1), and transthyretin (TTR).