We have used restriction fragment length polymorphism analysis to study the clonal involvement of the blood cells in a woman with myeloproliferative disease, whose initially high platelet count (940,000/microliter) spontaneously decreased during a normal pregnancy but then returned rapidly to the same high level after delivery of her child. Analysis of her erythroid progenitors showed the presence of erythropoietin-independent progenitors before, during, and after her pregnancy, consistent with a diagnosis of myeloproliferative disease, and persistence of the abnormal clone throughout the period of study. Analysis of DNA from her blood granulocytes showed these to be polyclonal at mid-pregnancy, when her platelet count had decreased to normal values, in comparison to the monoclonal pattern exhibited by her blood granulocytes 3 mo postpartum, when her platelet count was again elevated. These results demonstrate a partial conversion to normal, polyclonal hemopoiesis during her pregnancy and suggest a previously unanticipated differential sensitivity of normal and neoplastic hemopoietic cells to physiological changes associated with this state.
A G Turhan, R K Humphries, J D Cashman, D A Cuthbert, C J Eaves, A C Eaves
The Editorial Board will only consider comments that are deemed relevant and of interest to readers. The Journal will not post data that have not been subjected to peer review; or a comment that is essentially a reiteration of another comment.