FOLR1 and ovarian carcinoma: One study found significantly higher serum FOLR1 levels among 15 early-stage ovarian carcinoma patients than among 30 healthy women using a microfiltration assay; however, the authors reported much lower overall serum FOLR1 concentrations among healthy women (mean: ∼0.7 nmol/L [SD = 0.1] or 231 pg/ml [SD = 33]) [29] than observed in the current study.