Individuals with cancer often do not die as a result of their initial tumor but as a result of tumors at distant sites that are derived from the initial tumor. Pregnancy is a condition that seems to be permissive for tumor dissemination, as breast tumors arising during pregnancy display a tendency for early spread to distant sites (metastasis). Research in mice, led by Ivan Stamenkovic, at the University of Lausanne, Switzerland, has now uncovered a possible reason for this.
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