Comparison between Ki‐67 index and mitotic index for predicting outcome in canine mast cell tumours. (27th February 2015)

• Record Type: Journal Article
• Authors: van Lelyveld, S.; Warland, J.; Miller, R.; Maw, H.; Foale, R.; Goodfellow, M.; Dobson, J.
• Is Part Of: Journal of small animal practice. Volume 56:Number 5(2015:May)
• Page Start: 312
• Page End: 319
• Publication Date: 2015-02-27
• Subjects: Veterinary medicine -- Periodicals; Veterinary Medicine -- Periodicals; 636.089
• DOI: 10.1111/jsap.12320
• Languages: English
• ISSNs: 0022-4510

Abstract

<abstract abstract-type="main" id="jsap12320-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <sec id="jsap12320-sec-0001" sec-type="section"> <title>OBJECTIVES</title> <p id="jsap12320-para-0001">To assess correlation between Ki67 index and mitotic index and determine which more accurately predicts survival in canine mast cell tumours.</p> </sec> <sec id="jsap12320-sec-0002" sec-type="section"> <title>METHODS</title> <p id="jsap12320-para-0002">Retrospective analysis of cases from three UK referral hospitals. Correlation between Ki67 index and mitotic index was assessed and survival analysis performed.</p> </sec> <sec id="jsap12320-sec-0003" sec-type="section"> <title>RESULTS</title> <p id="jsap12320-para-0003">A total of 162 dogs were included: 57 dogs died with 37 due to mast cell tumour. Correlation between Ki67 index and mitotic index was moderate, while the agreement was poor. A high Ki67 index was considered sensitive (86 · 5%) at predicting mast cell tumour‐related death, but poorly specific (57 · 9%). Mitotic index(>5) was poorly sensitive (32 · 4%), but highly specific (96%). A mitotic index of <bold>ê</bold>2 had a 75 · 7% sensitivity and an 80 · 0% specificity. Ki67 index showed a statistically significant survival difference within the mitotic index <2 (P = 0 · 009) group. Ki67 index did not predict survival rate in tumours with mitotic index of <bold>ê</bold>2.</p> </sec> <sec id="jsap12320-sec-0004" sec-type="section"> <title>CLINICAL RELEVANCE</title> <p id="jsap12320-para-0004">Correlation between Ki67 and mitotic index is moderate. High mitotic index accurately predicted death, but many dogs with low mitotic index also died. Low Ki67 accurately predicted survival, but high Ki67 should not be considered a poor prognostic indicator. A three‐tier mitotic index assessment may more accurately predict death due to mast cell tumour.</p> </sec> </abstract>