Chimeric Antigen Receptor T-cell Therapy (CAR T-cell Therapy)

CAR T-cell therapy is most commonly used to treat certain blood cancers, including multiple myeloma, lymphoma, and leukemia. Researchers are also studying its potential use in other cancers and selected non-cancer conditions through ongoing clinical trials.

At present, autologous CAR T-cell therapy, which uses a patient’s own immune cells, is the most widely available approach. Allogeneic CAR T-cell therapy, which uses donor-derived cells, is still being evaluated in clinical trials.

With autologous CAR T-cell therapy:

• Patients use their own T-cells, which are collected from the blood
• The T-cells are genetically modified in a laboratory to recognize and attack cancer cells
• There is no need to find a donor, since the patient’s own immune cells are used
• The therapy is highly targeted, helping the immune system more precisely identify cancer cells

Before receiving CAR T-cells, patients receive a short course of low-dose chemotherapy (called lymphodepleting chemotherapy) to help prepare the body for the modified cells. After infusion, the CAR T-cells can expand inside the body and actively seek out and destroy cancer cells.

Unlike stem cell transplantation, CAR T-cell therapy does not rely on high-dose chemotherapy to eliminate cancer. Instead, it works by re-educating the immune system to recognize and fight the disease. This approach can lead to deep and sometimes long-lasting responses, even in patients whose cancer has returned after multiple treatments.

However, CAR T-cell therapy can cause unique immune-related side effects, including inflammation (cytokine release syndrome) and neurologic symptoms, which require close monitoring at a specialized treatment center. While relapse can still occur in some patients, CAR T-cell therapy offers a powerful option for cancers that are difficult to control with conventional treatments.

What Diseases Can BMT Treat?

BMTs are used to treat a wide range of conditions that affect the blood, bone marrow, and immune system. In some cases, a transplant is part of cancer treatment. In others, it replaces bone marrow that no longer works properly due to disease or genetic conditions.

BMT may be used to treat blood cancers, including:

• Leukemia (acute and chronic forms)
• Lymphoma, including Hodgkin and non-Hodgkin lymphoma
• Multiple myeloma
• Myelodysplastic syndromes and other bone marrow disorders

Bone marrow transplant can also treat noncancerous blood and immune conditions, such as:

• Aplastic anemia and other bone marrow failure syndromes
• Severe immune deficiency disorders
• Certain inherited blood diseases, including sickle cell disease and thalassemia

In select cases, BMT may be used for rare genetic or metabolic disorders that damage bone marrow or prevent the body from making healthy blood cells. A transplant can replace defective marrow with healthy, functioning stem cells.

Not every condition is treated the same way, and transplant may not be appropriate for everyone. Doctors carefully evaluate each patient’s diagnosis, overall health, and treatment goals to determine whether a bone marrow transplant is the right option.

What Should Patients Expect with a Bone Marrow Transplant?

Before the Bone Marrow Transplant

Care begins with a consultation and pretransplant workup. Patients meet their transplant physician and nurse, review medical history, and complete tests to ensure that they are healthy enough for transplant. They’ll also meet with a transplant coordinator and a social worker, who can help answer questions and prepare them for what’s ahead.

Some patients may be admitted to William P. Clements Jr. University Hospital before the transplant, while others may begin as outpatients based on their medical needs.

Patients may need one or more tests, such as:

• Bloodwork and imaging studies
• Heart and lung function tests
• Kidney and liver evaluations
• Bone marrow biopsy
• Dental evaluation to prevent infections
• Fertility preservation consultation, if appropriate

As part of the preparation, the care team will place a long, thin tube (called a central line) into a large vein in the patient’s chest or neck. This catheter stays in place throughout treatment and allows the team to safely infuse stem cells, medications, and blood products.

Stem Cell Collection

The collection process depends on the type of transplant:

• Autologous transplant: The patient gets injections of growth factors to stimulate stem cell production. The care team will collect the cells from the patient’s blood using a process called apheresis, then freeze and store them until transplant day.
• Allogeneic transplant: The donor typically undergoes a similar apheresis process. In some cases, doctors will collect bone marrow cells surgically from the donor’s pelvic bone.

After the Bone Marrow Transplant

In the days after transplant, blood cell counts will temporarily drop before the new cells begin to grow. During this time, the patient may be at increased risk for infection, anemia, or bleeding. Our care team will closely monitor the patient and may give medications, blood transfusions, or growth factors to help blood cell counts recover.

The new stem cells make their way to the bone marrow, where they begin to produce healthy blood cells. Most patients start to see their counts recover within 10 to 20 days.

Most patients stay in the hospital for three to four weeks after transplant, depending on how they’re doing. After discharge, they return to our clinic two to three times a week during the first 100 days. Full recovery can take several months to a year, and our transplant team will continue to support them every step of the way.

Full immune recovery takes time. While many patients resume daily activities within several months, complete recovery can take up to a year or longer, especially after donor transplants.

Bone marrow transplant outcomes vary widely. Success depends on factors such as the disease being treated, transplant type, donor match, patient age, and overall health. For some conditions, transplant can lead to long-term remission or cure. For others, it may extend survival or improve quality of life. Ongoing follow-up care is essential to monitor for complications and support long-term health.