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August 5, 1939, Vol 113, No. 6 >
Other Articles | August 5, 1939

Thirty-Sixth Annual Report, 1937-1938, of the Imperial Cancer Research Fund

JAMA. 1939;113(6):532. doi:10.1001/jama.1939.02800310070029.
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ABSTRACT

In 1936 Dr. Selbie found that colloidal thorium dioxide in small doses produced sarcoma at the site of the injection in a large proportion of rats and mice. This substance remains in the body indefinitely after injection. The Thirty-Fourth Annual Report contained a warning against the practice of leaving radioactive substances in the human body because of the danger of producing malignant growths. Dr. Foulds injected small quantities into the bases of the nipples of female guinea pigs and obtained one carcinoma and three sarcomas. Ten or fifteen years might be expected to elapse before the drug would produce a tumor in man, and, since the substance has not been in common use for so long, it is premature to conclude that it is harmless because no cancer has been traced to its use.

The report discusses the fundamental difference which is supposed to exist between squamous carcinoma and sarcoma

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