What to Expect With CAR T-Cell Therapy

CAR T-cell therapy is a type of T-cell transfer therapy. T-cell transfer therapy is a kind of immunotherapy that makes your own immune cells better able to attack cancer. It is also called adoptive cell therapy, adoptive immunotherapy, and immune cell therapy.

Instead of giving you a drug, this treatment uses your own T cells — a type of immune cell — changed or selected in a lab to fight your cancer.

CAR T-cell therapy turns your own immune cells into better cancer fighters.

There are two main types of T-cell transfer therapy: TIL therapy and CAR T-cell therapy. Both share the same basic steps:

1. Your own immune cells are collected.
2. Large numbers of these cells are grown in the lab.
3. The cells are given back to you through a needle in your vein.

Growing your T cells in the lab can take 2 to 8 weeks. During this time, you may have treatment with chemotherapy and maybe radiation therapy to get rid of other immune cells. Reducing your immune cells helps the transferred T cells work better. After these treatments, the lab-grown T cells are given back to you through a vein.

TIL therapy uses T cells called tumor-infiltrating lymphocytes that are found in your tumor. Doctors test these in the lab to find out which ones best recognize your tumor cells, then treat those selected cells so they grow to large numbers quickly. The idea is that these lymphocytes have already shown they can recognize your tumor, but there may not be enough of them — so giving you large numbers can help overcome that.

CAR T-cell therapy is similar to TIL therapy, but your T cells are changed in the lab so that they make a protein called CAR before they are grown and given back. CAR stands for chimeric antigen receptor. CARs are designed to let the T cells attach to specific proteins on the surface of cancer cells, improving their ability to attack.

A TIL therapy called lifileucel has been approved by the FDA to treat melanoma. It has also shown promise in other cancers, such as certain cervical and bile duct cancers, but for those it is still experimental.

Six CAR T-cell therapies have been approved by the FDA for blood cancers. CAR T-cell therapy has also been studied for solid tumors, including breast and brain cancers, but that use is still experimental.

T-cell transfer therapy can cause side effects that people experience in different ways. What you may have and how serious it is depends on how healthy you are before treatment, your type of cancer, how advanced it is, the type of therapy, and the dose. Doctors and nurses cannot know for sure when or if side effects will occur, so it is important to know which signs to look for.

Cytokine release syndrome. CAR T-cell therapy can cause this serious side effect. It happens when the transferred T cells, or other immune cells responding to them, release a large amount of cytokines into the blood. Cytokines are immune substances with many functions, and a sudden increase can cause fever, nausea, headache, rash, rapid heartbeat, low blood pressure, and trouble breathing. Most people have a mild form, but in some it can be severe or life-threatening.

Recognizing normal cells. Although CAR T cells are designed to recognize proteins found only on cancer cells, they can sometimes recognize normal cells too. Depending on which normal cells are affected, this can cause a range of side effects, including organ damage.

Capillary leak syndrome. TIL therapy can cause this syndrome, where fluid and proteins leak out of tiny blood vessels into surrounding tissues, causing dangerously low blood pressure. It may lead to multiple organ failure and shock.

Because serious side effects are possible, your team will monitor you closely and needs to hear about new symptoms right away.

Cytokine release syndrome usually starts in the first days after your cells are given back, so teams ask you to stay near the treating center for a set period. Follow the instructions in your wallet card, and show it to any clinician who sees you.

• Call 911 or go to an emergency department if you struggle to breathe, your heart races, you feel faint, or someone notices you are confused, slurring your words, or hard to rouse. Take your CAR T wallet card with you.
• Call your team now and go to an emergency department if your temperature reaches 100.4°F (38°C) or higher. After CAR T-cell therapy a fever is an emergency, not a wait-and-see symptom, because it is the usual first sign of cytokine release syndrome. Say that you have had CAR T cells as soon as you arrive.
• Call your care team the same day if you get a new headache, a rash, sickness, or a pounding heartbeat in the weeks after your cells are given back.
• Call your care team within a day or two if you feel newly muddled over words, handwriting or simple tasks, and it is not passing. Small changes in thinking are worth reporting early rather than watching.

• NCI — T-Cell Transfer Therapy
• NCI — Infection and Neutropenia During Cancer Treatment
• CDC — Fever During Chemotherapy