The results of cellular studies with rats are for those responsible for the US government department National Toxicology Program (NTP) apparently so explosive that they published partial results immediately. Reason for concern are two types of tumors that occurred only in the irradiated animals: malignant brain tumors (gliomas) and schwannoma of the heart. Furthermore, the researchers found an increased incidence of hyperplasia in the experimental animals. This extraordinary increase in the number of cells within a tissue is considered precancerous. Correspondingly high was the echo of the international press on the research results. However, not close at all commentators of NTP assessment. Rather, there is the usual downplaying associated with critical cellular studies.
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