AOPEP and Nephropathy: However, Wang et al. [33] claimed that urinary Lp (a) excretion in various nephropathy patients (such as IgA nephropathy patients) was decreased compared to controls, while our results showed a clearly increased level of Apo AI and Apo AIV in advanced stage (p<0.0001 and p<0.0003, respectively) (Table 3).