A 23-year-old man comes to the office due to a left-sided jaw mass that has rapidly enlarged over the past several weeks. The patient is an immigrant from East Africa. He has no known medical problems and takes no medications. Temperature is 37.1°C (98.8°F). Physical examination shows a large left-sided tumor on his jaw with associated lymphadenopathy but no erythema or warmth. The rest of the examination is unremarkable. HIV testing is negative. The lesion is biopsied, and numerous mitotic figures and apoptotic bodies are observed on histopathologic examination.

Which genetic feature is most likely to be present in the abnormal tissue?