High Incidences of Transmissible Kidney Tumors in Uninoculated Frogs Maintained in a Laboratory

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Abstract
Various workers have shown that the Lucké carcinoma, a transmissible kidney tumor of the leopard frog, occurs spontaneously at low incidence (6.7 percent maximum). However, we have consistently observed much higher incidences (50 percent maximum), a finding of probable significance in the epidemiology and natural transmission of the tumor. Age, metabolic level, and cross infection are being investigated as possible factors in determining the tumor incidence.

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