ABO genotyping of complete hydatidiform moles.

It has been suggested that the ABO blood group of a patient and her partner influence the clinical outcome for patients having a pregnancy with a complete hydatidiform mole (CHM). Since CHM lack red blood cells, it has not previously been possible to type CHM serologically and investigate the relationship between the blood group of the CHM and that of the patient. In the present study we have demonstrated the feasibility of using molecular genotyping to determine the ABO genotype of CHM, the ABO genotype being consistent with the androgenetic origin of CHM in all cases. In the series of 48 cases of CHM, the requirement for chemotherapy was not significantly different in those patients with a CHM of like blood group compared with those with a CHM of unlike blood group.