The expression of the protooncogene c-myc was examined in twelve canine mammary tumours of different histological type. Only in one tumour--a poorly differentiated carcinoma--was the amount of RNA that hybridized with our cDNA probe for the myc gene significantly increased. Restriction fragment length analysis of genomic DNA from this tumour did not reveal any amplification or other rearrangements in this gene locus.

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Expression of the myc protooncogene in canine rhabdomyosarcoma.

The expression of the protooncogene c-myc in a canine rhabdomyosarcoma was examined. It was found that this highly malignant tumour contained vast quantities of RNA that hybridized with a cDNA probe for c-myc. Restriction fragment length analysis after endonuclease digestion of tumour DNA did not reveal any rearrangements in this gene locus. The potential role of this oncogene in the development of canine rhabdomyosarcoma is discussed.

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