Other recent methods used alginates of Cd, Pb and Cd for the determination of AFP, CEA and PSA by DPV [57], or Cd and Pb apoferritins for the stripping voltammetric detection of AFP and CEA by SWV [58], and metal ions-doped chitosan poly(acrylic) nanospheres for determining four cancer biomarkers, CEA, CA19-9, CA125 and CA242, in a single voltammetric run [59]. Here, AFP is linked to cancer.