Cell therapy is an important part of regenerative medicine, cancer treatment, immunotherapy, and blood disorders. Some cell-based treatments are already approved for specific medical conditions, while many others are still being studied in clinical trials.

In the United States, the FDA regulates cellular therapy products and has approved a growing number of cell and gene therapies for specific conditions.

What Is Cell Therapy?

Cell therapy is a treatment that introduces living cells into a patient's body to achieve a medical purpose. The cells may come from the patient, a donor, or another approved source.

Depending on the treatment, these cells may:

• Replace damaged or missing cells
• Help repair tissue
• Support the immune system
• Attack cancer cells
• Restore blood-forming cells
• Reduce certain harmful immune responses
• Help improve the function of damaged tissue

Cell therapy can involve stem cells, immune cells, blood-forming cells, skin cells, cartilage cells, or other specialized cells.

Researchers are studying cell-based therapies for many areas of medicine, including cancer, blood disorders, immune diseases, and regenerative medicine.

How Does Cell Therapy Work?

The process depends on the type of cell therapy being used.

In some treatments, cells are collected from the patient's own body. These are called autologous cells. The cells may then be processed, expanded, or modified before being given back to the patient.

Other treatments use cells from a donor. These are called allogeneic cells.

A simplified cell therapy process may look like this:

1. Cell collection: Cells are collected from the patient or a donor.
2. Cell preparation: The cells are processed in a specialized laboratory.
3. Cell testing: The cells are tested for quality, identity, and safety.
4. Treatment: The cells are delivered to the patient through an infusion, injection, implant, or another method.
5. Monitoring: The patient is monitored for treatment response and possible side effects.

Some therapies also involve changing the cells before they are returned to the patient. CAR-T cell therapy, for example, uses a patient's T cells that are genetically modified so they can better recognize and attack certain cancer cells.

What Are the Main Types of Cell Therapy?

There is no single type of cell therapy. Different treatments use different cells and work in different ways.

1. Stem Cell Therapy

Stem cell therapy uses stem cells that can develop into specific types of cells or support tissue repair and blood-cell production.

One established example is hematopoietic stem cell transplantation, commonly known as a bone marrow or stem cell transplant. These blood-forming cells can help rebuild the blood and immune system after certain diseases or intensive cancer treatment.

However, the term "stem cell therapy" is also used for many experimental treatments. Patients should not assume that every stem cell treatment advertised by a clinic is FDA-approved.

2. CAR-T Cell Therapy

CAR-T cell therapy is a form of cellular immunotherapy used to treat certain cancers.

In this treatment, T cells are collected from a patient and genetically modified in a laboratory. The modified cells are designed to recognize specific targets on cancer cells. They are then expanded and returned to the patient's body.

CAR-T therapy has become an important treatment option for certain blood cancers, although it can cause serious side effects and is used under specialized medical supervision.

3. Mesenchymal Stromal Cell Therapy

Mesenchymal stromal cells, often called MSCs, are being studied for their potential effects on inflammation, immune responses, and tissue repair.

In December 2024, the FDA approved Ryoncil, an allogeneic mesenchymal stromal cell therapy, for a specific use in pediatric patients with steroid-refractory acute graft-versus-host disease.

This is an important distinction: approval applies to a specific product and medical indication. It does not mean that all MSC treatments are approved for every condition.

4. Blood-Forming Cell Therapy

Blood-forming stem cells, also known as hematopoietic stem cells, can be used to restore the blood and immune system.

These cells may come from bone marrow, peripheral blood, or umbilical cord blood, depending on the treatment.

They have an established role in treating certain blood cancers and other disorders affecting the blood-forming system.

5. Cancer Cell Therapy

Some cell therapies are designed specifically to help the immune system recognize and attack cancer.

Examples include CAR-T cell therapy and other cellular immunotherapies. The FDA's approved cellular and gene therapy list includes several cell-based cancer treatments.

What Are the Benefits of Cell Therapy?

The potential benefits of cell therapy depend heavily on the specific treatment and condition being treated.

Tissue Repair and Regeneration

Some cell therapies are being developed to help repair or replace damaged tissue. This is one reason cell therapy is closely connected with regenerative medicine.

Researchers are studying cell-based approaches for tissue and organ repair, although many applications remain experimental.

Treatment of Certain Cancers

Cell therapy has already changed the treatment landscape for some blood cancers.

CAR-T therapy uses a patient's own immune cells to identify and attack cancer cells. Other cellular immunotherapies are also being developed and tested.

Restoration of Blood and Immune Function

Hematopoietic stem cell transplantation can replace damaged blood-forming cells and help restore the patient's blood and immune systems.

Personalized Treatment

Some cell therapies are created using a patient's own cells. This can make the treatment highly personalized because the starting material comes directly from the individual.

New Options for Difficult Diseases

Cell therapy research may provide new treatment options for diseases where existing therapies are limited. Researchers are investigating cell-based treatments across cancer, immune disorders, regenerative medicine, and other areas.

What Are the Risks of Cell Therapy?

Cell therapy is not risk-free. The possible risks depend on the type of cells, how they are processed, how they are administered, and the patient's medical condition.

Possible risks include:

• Infection
• Immune reactions
• Inflammation
• Allergic or infusion reactions
• Damage related to the treatment procedure
• Cells growing or behaving in an unwanted way
• Graft-versus-host disease with certain donor-cell treatments
• Serious immune-related complications
• Failure of the treatment to produce the expected benefit

Some cellular immunotherapies can cause severe reactions. For example, certain CAR-T treatments can cause cytokine release syndrome and neurological complications, which require careful monitoring and specialized treatment.

The FDA has also warned consumers about unapproved regenerative medicine products. Reported risks associated with improperly marketed products include infections, immune reactions, tumor formation, and other serious complications.

Is Cell Therapy FDA Approved?

Yes, some cell therapies are FDA approved, but approval applies to specific products and specific medical uses.

The FDA maintains a list of approved cellular and gene therapy products. The list includes therapies involving immune cells, stem cells, genetically modified cells, and other cellular products.

At the same time, many cell therapies are still being investigated in clinical trials.

This is especially important when considering treatments advertised for conditions such as arthritis, chronic pain, neurological disorders, or other diseases. A treatment being described as "stem cell therapy" or "regenerative medicine" does not automatically mean it has FDA approval.

The FDA specifically advises patients to verify whether a regenerative medicine product is approved and to understand whether a proposed treatment is being offered as part of an appropriately regulated clinical trial.

Cell Therapy vs. Gene Therapy

Cell therapy and gene therapy are related but are not the same.

Cell therapy uses living cells as part of the treatment.

Gene therapy works by modifying or manipulating genetic material or gene expression to achieve a therapeutic effect.

Some modern treatments combine both approaches. CAR-T therapy is a good example because immune cells are collected and genetically modified before being returned to the patient.

The FDA regulates both cellular and gene therapy products in the United States.

What Is the Future of Cell Therapy?

Cell therapy is an active area of biomedical research. Scientists are working to make treatments safer, more effective, easier to manufacture, and available to more patients.

Current research includes:

• Next-generation CAR-T therapies
• Engineered immune cells
• Stem cell-based treatments
• Regenerative medicine
• Tissue engineering
• Personalized cell therapies
• Donor-derived cellular treatments
• Combination cell and gene therapies

The field is also moving toward more precise manufacturing and better methods for controlling how cells behave after they are administered.

Recent FDA approvals show that cellular therapy continues to move from experimental research into approved medical care. In June 2026, for example, the FDA approved Tregzi, an allogeneic regulatory T-cell-based immunotherapy used with matched-donor hematopoietic stem cell transplantation in adults with certain blood cancers.

Frequently Asked Questions About Cell Therapy

Is cell therapy the same as stem cell therapy?

No. Stem cell therapy is one type of cell therapy. Cell therapy is a broader term that can include stem cells, immune cells, cartilage cells, skin cells, and other types of therapeutic cells.

Is cell therapy safe?

Safety depends on the specific treatment. FDA-approved cell therapies have been evaluated for their intended uses, but they can still have risks and side effects. Experimental or unapproved treatments may have additional uncertainties.

What diseases can cell therapy treat?

Approved cell therapies are used for certain cancers, blood disorders, immune-related conditions, and other specific medical conditions. Many additional applications are still being studied in clinical trials.

Is CAR-T a cell therapy?

Yes. CAR-T is a type of cellular immunotherapy. It uses genetically modified T cells to target certain cancer cells.

Are all stem cell treatments FDA approved?

No. Many treatments marketed as stem cell therapies are not FDA approved. Patients should check the specific product, indication, and regulatory status before receiving treatment.

Final Thoughts

Cell therapy is an important area of modern medicine that uses living cells to treat specific diseases and support the body's biological functions. Its applications range from blood-forming stem cell transplantation to advanced cancer treatments such as CAR-T therapy.

The field has significant potential, but it is important to separate FDA-approved cell therapies from experimental treatments and unapproved products. Cell therapy can provide meaningful benefits in the right medical setting, but it can also carry serious risks.

Anyone considering cell therapy should discuss the treatment with a qualified healthcare professional and verify whether the specific therapy is FDA approved or being studied through an appropriate clinical trial.

Solid source: The U.S. Food and Drug Administration (FDA) maintains an official database of approved cellular and gene therapy products and provides consumer guidance on regenerative medicine therapies. FDA — Approved Cellular and Gene Therapy Products

Medical disclaimer: This article is for general educational purposes and is not a substitute for advice from a qualified healthcare professional.