HRAS and neoplasm: Fortunately, we obtained scFv antibodies that maintained all of the immunoreactivities of the original monoclonal KGH-R1 antibodies, including the recognition of wildtype and mutated p21Ras proteins, reaction with H-p21Ras, K-p21Ras and N-p21Ras, and strong immunostaining in tumour cell lines and primary tumours.