APOA4 and lung cancer: On the other hand, the plasma of lung cancer patients after chemotherapy was characterised by a higher abundance of two forms of apolipoprotein A-IV precursor, four forms of fibrinogen α chain, five forms of hemopexin, haptoglobin, α-2-macroglobulin isoform b, immunoglobulin heavy chain constant α 1 membrane bound isoform 1, and leucine-rich α-2 glycoprotein precursor.