Nisha Pandey

An experimental <span>pancreatic cancer vaccine</span> triggered an immune response against genetic mutations related to cancer in nearly 99% of patients according to a Phase 2 clinical trial. This has offered a new treatment strategy in tackling one of the deadliest cancers.

The vaccine, called <span>camupepimut</span>, is designed to train the immune system to attack cancer cells carrying mutations in the <span>KRAS</span> gene. The findings, published in <em>Nature Medicine</em>, come from a randomised trial led by researchers at Mayo Clinic.

<span>KRAS mutations</span> are found in approximately 90% of pancreatic ductal adenocarcinomas, the most common type of <span>pancreatic cancer</span>. These mutations help cancer cells grow and survive, making the gene an important target for researchers developing new treatments.

The trial included 144 patients with KRAS-mutated pancreatic <a href="https://www.healthandme.com/health-wellness/breast-cancer-awareness-day-experts-explain-most-overlooked-breast-changes-that-can-delay-diagnosis-in-men-article-156364460" data-type="tilCustomLink">cancer</a> who had undergone surgery and chemotherapy. None had visible signs of cancer on imaging when they entered the study. Researchers randomly assigned 96 patients to receive the vaccine, while 48 were placed in an observation group.

Of the 90 vaccinated patients whose immune responses could be evaluated, 89, or 98.9%, developed increased T-cell responses against mutated KRAS. In more than 80% of these patients, the immune response was over nine times stronger than before vaccination.

<h2>How Does The Pancreatic Cancer Vaccine Work?</h2>

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Camupepimut is an investigational therapeutic cancer vaccine designed to target seven common mutations in the KRAS gene.

Unlike preventive vaccines that protect people against infections that can cause cancer, therapeutic cancer vaccines aim to help the immune system recognise and attack cancer cells.

The vaccine is designed to direct an immune response towards the body's lymph nodes, where immune cells are activated. It stimulates T cells, a type of white blood cell that can identify and destroy abnormal cells carrying specific mutations.

The researchers found that the vaccine activated both CD4 and CD8 T cells. These immune cells play different roles in recognising abnormal cells and coordinating attacks against them. Also, among patients who could be evaluated at least 46 weeks after starting vaccination, 95.5% continued to show a detectable KRAS-specific T-cell response.

"Historically, <a href="https://www.healthandme.com/health-wellness/pancreatic-cancer-may-leave-molecular-clues-in-your-blood-how-the-new-liquid-biopsy-works-article-156353130" data-type="tilCustomLink">pancreatic cancer</a> has been very difficult to treat with immunotherapy," said Ben George, a Mayo Clinic medical oncologist and lead author of the study.

"What is encouraging is that we were able to generate a strong immune response against KRAS mutations in nearly every patient we evaluated. In an exploratory analysis, patients with greater immune responses to the vaccine appeared protected with longer disease-free survival times."

<h2>Did The Vaccine Prevent Pancreatic Cancer From Returning?</h2>

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Despite the strong immune response, the trial did not establish that camupepimut prevents pancreatic cancer recurrence.

There was no significant difference in survival without disease between the vaccinated and observation groups, which was the trial's primary outcome.

Median disease-free survival was 23.8 months among patients who received the vaccine, compared to 21.2 months in the observation group.

Researchers did, however, find a link between stronger immune responses induced by vaccines and longer periods without disease recurrence. 

The researchers also identified possible differences in response based on patients' previous treatment. Those who had received radiation therapy developed weaker immune responses related to KRAS because radiation was associated with lower levels of lymphocytes, which are important immune cells.

These findings may help researchers identify which patients are more likely to benefit from the vaccine, but they are not yet sufficient to guide treatment decisions.

"We've shown that we can teach the immune system to recognize these KRAS mutations," Dr George said. "The next step is finding out whether doing that can change the course of the disease for patients."

Currently, researchers are planning a Phase 3 clinical trial to investigate whether camupepimut can improve outcomes for patients with pancreatic cancer. 

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An experimental pancreatic cancer vaccine triggered an immune response against genetic mutations related to cancer in nearly 99% of patients according to a Phase 2 clinical trial. This has offered a new treatment strategy in tackling one of the deadliest cancers.The vaccine, called camupepimut, is designed to train the immune system to attack cancer cells carrying mutations in the KRAS gene. The findings, published in Nature Medicine, come from a randomised trial led by researchers at Mayo Clinic.KRAS mutations are found in approximately 90% of pancreatic ductal adenocarcinomas, the most common type of pancreatic cancer. These mutations help cancer cells grow and survive, making the gene an important target for researchers developing new treatments.The trial included 144 patients with KRAS-mutated pancreatic cancer who had undergone surgery and chemotherapy. None had visible signs of cancer on imaging when they entered the study. Researchers randomly assigned 96 patients to receive the vaccine, while 48 were placed in an observation group.Of the 90 vaccinated patients whose immune responses could be evaluated, 89, or 98.9%, developed increased T-cell responses against mutated KRAS. In more than 80% of these patients, the immune response was over nine times stronger than before vaccination.How Does The Pancreatic Cancer Vaccine Work?Also read: Top Neurologist Says Stroke Could Be First Sign of Undiagnosed Cancer: Red Flags to Know | InterviewCamupepimut is an investigational therapeutic cancer vaccine designed to target seven common mutations in the KRAS gene.Unlike preventive vaccines that protect people against infections that can cause cancer, therapeutic cancer vaccines aim to help the immune system recognise and attack cancer cells.The vaccine is designed to direct an immune response towards the body's lymph nodes, where immune cells are activated. It stimulates T cells, a type of white blood cell that can identify and destroy abnormal cells carrying specific mutations.The researchers found that the vaccine activated both CD4 and CD8 T cells. These immune cells play different roles in recognising abnormal cells and coordinating attacks against them. Also, among patients who could be evaluated at least 46 weeks after starting vaccination, 95.5% continued to show a detectable KRAS-specific T-cell response."Historically, pancreatic cancer has been very difficult to treat with immunotherapy," said Ben George, a Mayo Clinic medical oncologist and lead author of the study."What is encouraging is that we were able to generate a strong immune response against KRAS mutations in nearly every patient we evaluated. In an exploratory analysis, patients with greater immune responses to the vaccine appeared protected with longer disease-free survival times."Did The Vaccine Prevent Pancreatic Cancer From Returning?   Despite the strong immune response, the trial did not establish that camupepimut prevents pancreatic cancer recurrence.There was no significant difference in survival without disease between the vaccinated and observation groups, which was the trial's primary outcome.Median disease-free survival was 23.8 months among patients who received the vaccine, compared to 21.2 months in the observation group.Researchers did, however, find a link between stronger immune responses induced by vaccines and longer periods without disease recurrence. The researchers also identified possible differences in response based on patients' previous treatment. Those who had received radiation therapy developed weaker immune responses related to KRAS because radiation was associated with lower levels of lymphocytes, which are important immune cells.These findings may help researchers identify which patients are more likely to benefit from the vaccine, but they are not yet sufficient to guide treatment decisions."We've shown that we can teach the immune system to recognize these KRAS mutations," Dr George said. "The next step is finding out whether doing that can change the course of the disease for patients."Currently, researchers are planning a Phase 3 clinical trial to investigate whether camupepimut can improve outcomes for patients with pancreatic cancer. 

new pancreatic cancer vaccine triggers immune response in 99% of patients

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