Why are prognostic biomarkers that predict natural progression after surgical removal of a mast cell tumor particularly useful?

• A. They inform about surgical technique.
• B. They indicate how to monitor anesthesia depth.
• C. They can assist clinicians and owners in deciding whether to pursue additional adjunctive therapy.
• D. They predict patient response to radiation therapy.

Answer: (C)

Prognostic biomarkers after surgical removal of a mast cell tumor are valuable because they quantify how likely the tumor is to behave aggressively if left untreated, guiding post-operative management. Canines with MCTs show a spectrum of behavior—from cure with surgery alone to rapid progression and metastasis. Biomarkers such as histologic grade, mitotic index, proliferation markers (like Ki-67), and KIT expression patterns correlate with the risk of recurrence or spread. When these biomarkers indicate high risk, clinicians and owners can choose to add adjunctive therapy (chemotherapy or radiation) to improve disease control; when they indicate low risk, careful monitoring may be appropriate to avoid unnecessary treatment and side effects. These biomarkers provide information about natural progression after surgery rather than about how to perform the surgery, anesthesia depth, or how the tumor will respond to radiation, though they influence decisions about follow-up and additional therapy.