Las 7 noticias más esperanzadoras sobre cáncer en 2022
La investigación del cáncer ha dado nuevos y prometedores giros en 2022, desde avances que podrían acelerar las vacunas contra el cáncer hasta ...
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La primera inmunoterapia con células T CAR no fue aprobada por la FDA [organismo regulador de medicamentos de Estados Unidos] hasta 2017, pero la tecnología se ha convertido desde entonces en uno de los tratamientos más prometedores para una variedad de cánceres. Las terapias basadas en CAR consisten en extraer las células inmunitarias de una persona y diseñarlas genéticamente para que reconozcan y combatan mejor el cáncer antes de infundirlas de nuevo en el cuerpo. En 2010, dos pacientes con cáncer de sangre recibieron una forma de terapia con células T CAR; ahora, una década después, esos pacientes siguen en remisión. En una sesión informativa celebrada en febrero para anunciar los resultados, el oncólogo David Porter, de la Universidad de Pensilvania, afirmó que la terapia había funcionado "más allá de nuestras expectativas más descabelladas". Las terapias CAR no funcionan para todo el mundo, pero han demostrado ser muy eficaces para determinados tipos de cáncer y adaptables a otras afecciones. El pasado mes de septiembre, los investigadores informaron de que cinco pacientes con lupus, una enfermedad autoinmune, recibieron tratamientos con células T CAR que parecieron restablecer sus sistemas inmunitarios y desterrar sus síntomas. En declaraciones a <anchor>Science News</anchor>, el inmunólogo Linrong Lu, del Instituto de Inmunoterapia de Shanghai (China), calificó los resultados de "revolucionarios."
Genetically modified immune cells put 5 people's lupus in remission | Science News
Genetically modified immune cells put 5 people's lupus in remission \| Science News

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# 5 people with lupus are in remission after CAR-T cell treatment

Altering immune cells could be a promising treatment for the autoimmune disease

![illustration of a blue immune cell gobbling up rainbow-colored immune proteins](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2022/09/091522_eg_lupus-cart_feat.jpg?fit=1030%2C580&ssl=1)

Traditional treatments for lupus do not work in all patients. Genetically engineering immune cells to destroy immune proteins (illustrated) that damage healthy tissue could put the disease in remission.

Keith Chambers/Science Photo Library/Getty Images Plus

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By [Erin Garcia de Jesús](https://www.sciencenews.org/author/erin-garcia-de-jesus "Posts by Erin Garcia de Jesús")

September 15, 2022 at 3:38 pm

After receiving an experimental treatment to stop the body from attacking itself, five people no longer have any symptoms of lupus.

That treatment, called CAR-T cell therapy, seems to have reset the patients’ immune systems, [sending their autoimmune disease into remission](https://www.nature.com/articles/s41591-022-02017-5), researchers report September 15 in _Nature Medicine_. It’s not yet clear how long the relief will last or whether the therapy will work for all patients.

Even so, the results could be “revolutionary,” says immunologist Linrong Lu of the Shanghai Immune Therapy Institute at the Shanghai Jiao Tong University School of Medicine, who was not involved in the study. [CAR-T cell therapy](https://www.sciencenews.org/article/cancer-genetically-engineered-immune-cells-car-t-therapy-remission) has been used for various types of cancer, but it’s still in testing for autoimmune diseases ( _SN: 2/2/22_).

In the new study, all five participants went into remission without needing additional drugs beyond the genetically engineered CAR-T cells. The target of those engineered cells — immune cells key for fighting off infections — returned a few months after being wiped out. Some of those cells are primed to attack viruses and bacteria but not the study participants’ healthy cells.

It’s unknown how many people worldwide have lupus, a painful disease in which some [immune proteins called antibodies attack healthy tissue and organs](https://www.sciencenews.org/article/lack-circular-rna-may-trigger-lupus) ( _SN: 4/25/19_). An estimated 161,000 to 322,000 people in the United States live with the most common form called systemic lupus erythematosus. While there are effective therapies, those treatments don’t work for everyone.

The five people in the study had this common form with symptoms resistant to multiple commonly used lupus drugs, such as hydroxychloroquine. But laboratory studies in mice hinted that CAR-T cells might help. So immunologist Georg Schett and colleagues took T cells from each patient and genetically modified the cells to track down and kill all antibody-producing cells. All five participants — four female and one male ages 18 to 24 — were in remission three months after being treated with the altered cells.

The antibody-producing cells, called B cells, disappeared from blood samples as the CAR-T cells killed them off. But B cells are an important defense against infectious diseases such as measles. Luckily, the immune cells weren’t gone permanently, says Schett, of Friedrich-Alexander-Universität Erlangen-Nürnberg in Germany. A few months later, the patients’ bone marrow had made more. The B cells were back; the lupus was not.

“Which means, in a way, that we have a reset of the immune system in these young individuals,” Schett says.

Typically, the immune system has checkpoints that eliminate cells that attack the body instead of a foreign invader. Autoimmune diseases such as lupus occur when these cells that recognize and attack “self” escape scrutiny. For lupus to come back, Schett says, the same mistake may need to happen twice. “So far we think the disease is gone.”

To know for sure, the team needs more time to follow the participants. In August 2021, the researchers reported in the _New England Journal of Medicine_ that the first treated participant, a 20-year-old woman, was [in remission three months after receiving the drug](https://www.nejm.org/doi/10.1056/NEJMc2107725). Now, that patient has been healthy for a year and a half, Schett says. The other four have been healthy for six months to a year. Time will tell how long these people will stay lupus-free.

Which people might benefit most from CAR-T cell therapy is not yet clear either. Lupus symptoms and severity vary from person to person. The treatment could, for instance, be most useful for patients who are in earlier stages of the disease before it becomes too severe, Lu says. Still, if future clinical trials prove effective, CAR-T cell therapy could be another way to offer hope to patients with the disease.

Questions or comments on this article? E-mail us at [feedback@sciencenews.org](mailto:feedback@sciencenews.org) \| [Reprints FAQ](https://www.sciencenews.org/permission-republish)

A version of this article appears in the [October 8, 2022](https://www.sciencenews.org/sn-magazine/october-8-22-2022) issue of Science News.

### Citations

A. Mackensen _et al_. [Anti-CD19 CAR T cell therapy for refractory systemic lupus erythematosus.](https://www.nature.com/articles/s41591-022-02017-5) _Nature Medicine_. Published online September 15, 2022. doi: 10.1038/s41591-022-02017-5.

D. Mougiakakos _et al_. [CD19-targeted CAR T cells in refractory systemic lupus erythematosus _._](https://www.nejm.org/doi/10.1056/NEJMc2107725) _New England Journal of Medicine_. Vol. 385, August 5, 2021, p. 567. doi: 10.1056/NEJMc2107725.

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