The histologic and epidemiologic bases for prognostic considerations in canine melanocytic neoplasia

Veterinary Pathology
W L Spangler, Philip H Kass

Abstract

The laboratory records from 384 dogs with a diagnosis of either melanoma or melanocytoma were selected for study. Significant negative determinants of patient survival for melanocytic tumors were: 1) metastasis, 2) mitotic index (MI), 3) nuclear atypia, 4) tumor score, 5) increasing size/volume, 6) the presence of deep inflammation, and/or 7) intralesional necrosis. In addition to these attributes, age was a significant determinant for tumors of the skin. For the feet and lips, 8) age and 9) junction activity negatively impacted survival. Mathematic models were constructed based on these significant determinants to predict the postsurgical outcome of melanocytic neoplasia. Melanocytic oral neoplasms comprised 19% (73/384) of the neoplasms; 92% of these were classified as malignant in the biopsy report, but malignant behavior (i.e., metastasis or recurrence) was observed in only 59% of cases. The prognostic model for oral tumors based on nuclear atypia provided the most accurate (89%) prediction of overall behavior. Melanocytic tumors of the feet and lips were also 19% (73/384) of the total population. Seventy-four percent were reported malignant, whereas only 38% actually demonstrated malignant behavior. The prognostic models b...Continue Reading

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Methods Mentioned

BETA
biopsy
amputation

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