THE DIFFERENCE IN DNA-PLOIDY PATTERN BETWEEN SOME CANINE AND HUMAN NEOPLASMS APPEARS TO BE GENUINE AND A REFLECTION OF DISSIMILARITIES IN DNA ANEUPLOIDY EVOLUTION
Cj. Cornelisse et al., THE DIFFERENCE IN DNA-PLOIDY PATTERN BETWEEN SOME CANINE AND HUMAN NEOPLASMS APPEARS TO BE GENUINE AND A REFLECTION OF DISSIMILARITIES IN DNA ANEUPLOIDY EVOLUTION, Anticancer research, 14(4A), 1994, pp. 1599-1601
In a reaction to the article by Deitch et al, (Anticancer Res 13: 2117
-2118, 1993) evidence is presented that flow cytometrically detected D
NA-hypodiploidy in canine neoplasms is genuine and not an artefact cau
sed by autolysis or chemotherapy. Intervals between removal of tumors
and freezing in our studies were much shorter (average 15 min, maximum
30 min) than e.g. for human breast tumors in which the percentage of
hypodiploidy is about 2%. Also average CVs for the G0,1 peaks in our F
CM analysis of canine tumors (mammary 2.27+0.06, n = 179); thyroid 2.5
7+0.13, n = 88) were equal to or less than those usually found in the
comparable human tumors. Biological arguments in favor of the existenc
e of genuine hypodiploid stemlines are the finding of tetraploidized s
ubclones of the original hypodiploid clone, the reappearance of the sa
me hypodiploid stemline in distant metastases during clinical follow u
p, and the isolation of a cytogenetically and flow cytometrically hypo
diploid cell line from a primary canine mammary carcinoma. It is concl
uded that Deitch et al, incorrectly have invoked autolysis as a source
of hypodiploidy in our original studies on canine neoplasms. Our evid
ence for interspecies differences in the evolution of aneuploidy in tu
mors of the same organ therefore remains unchallenged.