Early pregnancy factor (EPF) as tumour marker in two patients with trophoblastic tumour.

Two patients with a trophoblastic tumour (one with an invasive mole and one with a choriocarcinoma) had early pregnancy factor (EPF; detected by rosette inhibition test) in serum. In both cases the EPF already disappeared during surgery which suggests that EPF could be a useful and sensitive tumour marker if laboratory technology for its detection could be improved.