A database survey of equine tumours in the United Kingdom.
Authors: Knowles E J, Tremaine W H, Pearson G R, Mair T S
Journal: Equine veterinary journal
Summary
# Editorial Summary: Equine Tumour Prevalence and Risk Factors in the UK (2016) Over nearly three decades, researchers at the University of Bristol analysed 964 equine tumour cases to establish which neoplasms are most commonly diagnosed in clinical practice and whether specific breeds, ages or sexes show increased susceptibility. Sarcoids dominated the caseload at 24%, followed by squamous cell carcinoma (19%), lymphoma (14%), melanoma (6%), gonadal stromal tumours (6%) and mast cell tumours (4%); logistic regression revealed that advancing age significantly increased odds for all tumour types except sarcoid, mares showed protective effects against SCC, ponies had elevated melanoma risk, and Cob-types presented higher rates of both SCC and MCT. Notably, the proportion of sarcoid and lymphoma diagnoses declined across successive decades, whilst the mean age of submitted cases and breed diversity increased, suggesting either genuine epidemiological shifts or changing submission patterns to the laboratory. These findings provide contemporary baseline data for clinical decision-making and prognostic counselling, though practitioners should interpret results cautiously given potential referral bias inherent in laboratory-based surveys.
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Practical Takeaways
- •Sarcoid remains the most frequently diagnosed equine tumour; clinicians should maintain high suspicion for this condition and understand its epidemiology across breed and sex groups
- •Older horses are at significantly higher risk for most tumour types (except sarcoid), warranting increased vigilance during routine examinations of geriatric horses
- •Certain breeds show predisposition to specific tumours (Arabs to mast cell tumours, Cobs to squamous cell carcinomas and mast cell tumours, ponies to melanomas), which should inform clinical assessment and client communication
Key Findings
- •Sarcoid was the most common equine tumour (24% of 964 cases), followed by squamous cell carcinoma (19%) and lymphoma (14%) in a 29-year UK pathology database
- •Age was significantly associated with increased odds of all tumour types except sarcoid; breed and sex factors influenced tumour risk (mares had reduced SCC risk, Arabs had higher MCT risk, Cobs had increased SCC and MCT risk, ponies had increased melanoma risk)
- •The proportion of sarcoids and lymphoma diagnoses declined in later decades while mean submission age and breed diversity increased