How long does Afamitresgene Autoleucel Injection stay in your system?
Last updated September 7, 2026.
**Afamitresgene autoleucel (Tecelra) can persist in your body for more than 3 years after infusion.** This treatment uses your own genetically modified immune cells to target synovial sarcoma. These living cells multiply after infusion, then decline, with persistence varying widely between people. There is no established date when all the cells leave your body, and their presence does not guarantee ongoing cancer control. Keep your oncology visits and scheduled blood tests even when you feel well.
What to do
- **Keep follow-up visits:** Attend your scheduled oncology appointments and blood tests.
- **Stay nearby:** Remain near a healthcare facility for at least 2 weeks after infusion.
- **Arrange transportation:** Avoid driving for at least 2 weeks after treatment.
- **Seek immediate care:** Get medical attention immediately for fever, confusion, or shortness of breath.
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