This study tests a new treatment called VCAR33, a type of therapy using **CAR T cells**. These are special immune cells that are trained to find and attack cancer cells. This treatment is for patients with a kind of blood cancer called **acute myeloid leukemia (AML)**, which has not responded well to other treatments or has come back after a **stem cell transplant**. The study will check if VCAR33 is safe and if it works to help patients. It uses cells from the patient's original stem cell donor, which may help them work better.

Key Points:

• The study involves several visits and close monitoring for side effects.
• Participants must have had a previous stem cell transplant and meet certain health requirements.
• There are risks involved, including potential side effects from the CAR T cell therapy.