What is a key characteristic of vaccine-induced sarcomas regarding their occurrence?

Vaccine-induced sarcomas, particularly in cats, are tumors that typically develop in response to vaccinations. A key characteristic of these sarcomas is their higher local recurrence rates. After surgical excision, they often recur at the site due to their aggressive nature and the biological behavior of the tumor cells, which may have a tendency for local infiltration and incomplete resection.

This behavior is linked to the specific type of tissue reaction that occurs at the vaccination site. Such reactions can lead to complications in treatment, often necessitating more extensive surgical measures than would typically be required for other types of tumors. The local recurrence rates are of significant concern, as they can affect the prognosis and overall management of the affected animal.

In contrast, characteristics such as occurrence in older age or less aggressive behavior do not accurately represent the typical context of vaccine-induced sarcomas. Additionally, lower cellular activity would imply a more benign behavior, which is not the case for these tumors as they often exhibit a significant level of activity and invasion.