CD55 and lung cancer: The capacity of CD55 to bind to 177Lu-anti-CD55 antibody was confirmed by competitive binding assays using H460 lung cancer cells with high CD55 expression (CD55high), H358 cells with moderate CD55 expression (CD55mod), and H69 cells with low CD55 expression (CD55low), as well as WI-38 normal lung cells with low CD55 expression (CD55low).