TPO and thyroid gland carcinoma: Cytotoxic activity, complement-dependent cytotoxicity (CDC) and ADCC, of purified human recombinant anti-TPO aAbs (B4 and B4′) expressed in respectively baculovirus and CHO cells, were studied on thyroid carcinoma cells and compared with those of circulating anti-TPO aAbs purified from the sera of patients suffering from AITD, using the same target cells.