Sex chromatin of hydatidiform moles.

The placenta is a homograft which is tolerated by the host for an unusually long time. The hydatidiform mole may be said to be even more successful in this respect for it can survive longer and penetrate further in the host even in the absence of a viable foetus. Recent observations that a large number of hydatidiform moles are chromatin positive are of much interest, but so far the reported series have been small. In the Far East molar pregnancies occur with a greater frequency. This study is based on 185 cases of hydatidiform moles collected from Malaya, and it is hoped that this large material may furnish additional data on the nuclear sex of these tumours.