Histological evidence of superficial inflammation is associated with lower recurrence of equine sarcoids following surgical removal: A follow-up study of 106 tumours in 64 horses.
Authors: Curnow B, Rich A F, Ireland J, Correa D Cubillos, Dunn J, Jenkins D, Carslake H, Ressel L
Journal: Veterinary journal (London, England : 1997)
Summary
# Editorial Summary Equine sarcoids remain the most common skin tumour in horses, yet until recently their histopathological features had not been systematically evaluated for prognostic value. Curnow and colleagues conducted a retrospective cohort study of 106 sarcoids excised from 64 horses at Leahurst between 2010–2015, re-examining archived histological samples and obtaining long-term follow-up data via telephone questionnaire to identify associations between tumour characteristics and recurrence. Nearly half the horses (46.9%) experienced recurrence at the original surgical site, whilst a third (32.8%) developed sarcoids at distant locations; however, histological evidence of superficial inflammation emerged as the only significant protective factor, reducing recurrence odds by 68% (adjusted OR 0.32, 95% CI 0.10–0.96). These findings suggest that the host inflammatory response may actively suppress local recurrence, implying that adjunctive therapies designed to augment rather than suppress inflammation warrant investigation as potential strategies to improve surgical outcomes. For practitioners managing sarcoid cases, this adds nuance to treatment planning and client counselling regarding prognosis, particularly in cases where pathology reports document inflammatory changes around the lesion margin.
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Practical Takeaways
- •Nearly half of equine sarcoids recur at the surgical site after excision; histological assessment of inflammation status may help predict recurrence risk
- •Presence of superficial inflammation in excised sarcoid tissue is a favorable prognostic indicator for reduced recurrence at the original site
- •Owners should be counseled that approximately one-third of horses develop new sarcoids at distant anatomical sites regardless of local recurrence status
Key Findings
- •Sarcoid recurrence at the surgical site occurred in 46.9% of 64 horses (30 cases) following excision
- •New sarcoids developed at distant sites in 32.8% of horses (21 cases)
- •Superficial inflammation on histopathology was associated with significantly reduced recurrence risk (adjusted odds ratio 0.32, P = 0.04)
- •The inflammatory process may provide a protective mechanism against sarcoid recurrence