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New therapy strengthens the immune system’s counterattack on skin cancer

July 1, 2024
in Health
New therapy strengthens the immune system’s counterattack on skin cancer
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New therapy strengthens the immune system's counterattack on skin cancer

Stained electron micrograph of a T cell. Scientists have shown in laboratory experiments that they are able to create a large number of the T cells that are capable of killing cancer cells. Credit: NIAID

An international research team has demonstrated a method to identify the cells in the immune system that can recognize and fight cancer cells in samples from 9 out of 10 patients affected by the rare but aggressive form of skin cancer, Merkel cell carcinoma.

The results of the research have been published in the Journal of Clinical Investigation and may eventually open up new forms of immunotherapy in the treatment of people with Merkel cell cancer.

The research project was conducted by an international team of researchers from universities and hospitals in the U.S., Germany, Denmark and was led by Professor Sine Reker Hadrup from DTU.

The researchers have identified the elements in Merkel cell polyomavirus, known as epitopes, that can be recognized by the immune system’s T cells. Merkel cell polyomavirus is directly implicated in the development of Merkel cell cancer.

Normally, the immune system is able to recognize and defeat these epitopes, but in elderly and immunocompromised patients in particular, this response is impaired. In trials, researchers have shown that patients’ ability to mount an immune response against these elements determines how effective immunotherapy is in treating their skin cancer.

Building on previous treatment trials, the researchers are now working to further boost the immune response in patients with Merkel cell carcinoma, and they have shown that they are able to generate large numbers of the desired T cells—even in patients who normally have none.

In the trials, the researchers used a known treatment principle of blocking a channel in the immune system, known as immune checkpoint blockade. The treatment principle was awarded the Nobel Prize in Medicine in 2018 and is now a widely used treatment strategy for many cancers. The treatment involves blocking the so-called PD1 receptor—a structure that normally slows down the immune system’s T cells after an infection in the body.

Boosting the body’s immune system

In the laboratory experiments, the researchers take T cells from patients and mix them with a nanostructure that they have designed to stimulate the immune system’s T cells against the very elements of the Merkel cell polyomavirus that are involved in cancer formation. In this way, the researchers can create a large number of the T cells that are capable of killing cancer cells. The method is based on a DTU-patented technology—an expansion strategy for T cells—developed by Sine Reker Hadrup.

“In the trial, we show that the expansion strategy for immune cells that can fight Merkel cell cancer is relevant for people with this type of cancer. We have designed some molecular structures that contain a number of different molecules that can activate the reaction in the immune system that can defeat the cancer cells,” says Sine Reker Hadrup.

Sine Reker Hadrup believes that the next step in the research is to conduct a larger study and then use the results in a trial treatment with patients. In the longer term, the research results open up the possibility of developing the treatment into a new type of immunotherapy for patients with Merkel cell cancer.

Merkel cell carcinoma

Merkel cell carcinoma is a rare and aggressive type of skin cancer caused by Merkel cell polyomavirus and/or UV radiation. It is also known as Merkel cell carcinoma and is treated with surgery, radiation, immunotherapy or chemotherapy.

Merkel cell carcinoma is mainly found in the head and neck area and on the arms and legs, where the skin gets the most sun.

It usually appears as a firm reddish/purple bump on the skin that is not tender but grows rapidly. To make a diagnosis, a tissue sample is taken. The disease usually affects people over the age of 70—and women are affected slightly more often than men.

In about a third, the disease has spread by the time of diagnosis. This type of cancer is very rare. In Denmark, approximately 26 people are affected annually, and the number has increased in recent years.

More information:
Ulla Kring Hansen et al, T antigen–specific CD8+ T cells associate with PD-1 blockade response in virus-positive Merkel cell carcinoma, Journal of Clinical Investigation (2024). DOI: 10.1172/JCI177082

Provided by
DTU (Technical University of Denmark)

Citation:
New therapy strengthens the immune system’s counterattack on skin cancer (2024, July 1)
retrieved 1 July 2024
from https://medicalxpress.com/news/2024-07-therapy-immune-counterattack-skin-cancer.html

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
part may be reproduced without the written permission. The content is provided for information purposes only.

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Copyright for syndicated content belongs to the linked Source : Medical Xpress – https://medicalxpress.com/news/2024-07-therapy-immune-counterattack-skin-cancer.html

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