Feline Injection-Site Sarcoma: Revisiting Pathogenesis in the Light of Current Evidence

And yet, more than three decades later, the pathogenesis of FISS remains incompletely understood. The broad strokes are established: chronic local inflammation at an injection site appears to trigger malignant transformation of fibroblasts or myofibroblasts in genetically susceptible cats. But the molecular details — what drives that transformation, why only certain cats develop it, and which specific pathways sustain tumor growth — are still being worked out.