The next big advance in cancer treatment could be a vaccine that can shrink tumours and stop cancer from returning, US experts have said.
After decades of limited success, scientists say research has reached a turning point, with many predicting more vaccines will be available in five years. These are not traditional vaccines that prevent disease, but jabs to shrink tumours and stop the return of cancers.
Targets for these experimental treatments include breast and lung cancer, with gains reported this year for deadly skin cancer melanoma and pancreatic cancer.
Patient volunteers say they are taking part not only in the hopes of shrinking their tumours, but also to help future cancer patients.
Dr James Gulley, who helps lead a centre at the National Cancer Institute that develops immune therapies, including cancer treatment vaccines, said: “We’re getting something to work. Now we need to get it to work better.”
More than ever, scientists understand how cancer hides from the body’s immune system. Cancer vaccines, like other immunotherapies, boost the immune system to find and kill cancer cells. Some new ones use mRNA, which was developed for cancer but was first used for Covid-19 vaccines.
[ Over 4,000 cancer diagnoses during Covid pandemic ‘may have been missed’Opens in new window ]
For a vaccine to work on cancers, it needs to teach the immune system’s T cells to recognise cancer as dangerous, said Dr Nora Disis of UW Medicine’s Cancer Vaccine Institute in Seattle. Once trained, T cells can travel anywhere in the body to hunt down danger.
Vaccines are probably the next big thing. We’re dedicating our lives to that
— Steve Lipkin, Weill Cornell Medicine
“If you saw an activated T cell, it almost has feet,” she said. “You can see it crawling through the blood vessel to get out into the tissues.”
Patient volunteers such as 50-year-old Kathleen Jade are crucial to the research. She learned she had breast cancer in late February, just weeks before she and her husband were to depart Seattle for a round-the-world adventure. Instead of sailing their 46ft boat, Shadowfax, through the Great Lakes toward the St Lawrence Seaway, she was sitting on a hospital bed awaiting her third dose of an experimental vaccine.
She has been receiving the vaccine to see whether it will shrink her tumour before surgery. “Even if that chance is a little bit, I felt like it’s worth it,” she said.
Progress on treatment vaccines has been challenging. The first, Provenge, was approved in the US in 2010 to treat prostate cancer that had spread. It requires processing a patient’s own immune cells in a lab and giving them back intravenously.
There are also treatment vaccines for early bladder cancer and advanced melanoma.
Early cancer vaccine research faltered as cancer outwitted and outlasted patients’ weak immune systems, said Olja Finn, a vaccine researcher at the University of Pittsburgh School of Medicine.
“All of these trials that failed allowed us to learn so much,” Ms Finn said. As a result, she is now focused on patients with earlier disease since the experimental vaccines did not help with more advanced patients. Her group is planning a vaccine study in women with a low-risk, non-invasive breast cancer called ductal carcinoma in situ.
More vaccines that prevent cancer may appear in the future, too. Decades-old hepatitis B vaccines prevent liver cancer, and HPV vaccines, introduced in 2006, prevent cervical cancer.
In Philadelphia, Dr Susan Domchek, director of the Basser Center at Penn Medicine, is recruiting 28 healthy people with BRCA mutations for a vaccine test. Those mutations increase the risk of breast and ovarian cancer. The idea is to kill very early abnormal cells before they cause problems. She likens it to periodically weeding a garden or erasing a whiteboard.
Others are developing vaccines to prevent cancer in people with precancerous lung nodules and other inherited conditions that raise cancer risk.
[ Pancreatic cancer vaccine shows promise in small trialOpens in new window ]
“Vaccines are probably the next big thing” in the quest to reduce cancer deaths, said Dr Steve Lipkin, a medical geneticist at New York’s Weill Cornell Medicine, who is leading one effort funded by the National Cancer Institute. “We’re dedicating our lives to that.”
People with the inherited condition known as Lynch syndrome have a 60 per cent to 80 per cent lifetime risk of developing cancer. Recruiting them for cancer vaccine trials has been remarkably easy, said Dr Eduardo Vilar-Sanchez of MD Anderson Cancer Centre in Houston, who is leading two government-funded studies on vaccines for Lynch-related cancers.
“Patients are jumping on this in a surprising and positive way,” he said.
Drugmakers Moderna and Merck, which trades outside the US as MSD, are jointly developing a personalised mRNA vaccine for patients with melanoma, with a large study to begin this year.
I have nothing to lose and everything to gain, either for me or for other people down the road
— Todd Pieper, cancer patient
The vaccines are customised to each patient, based on the numerous mutations in their cancer tissue. A vaccine personalised in this way can train the immune system to hunt for the cancer’s mutation fingerprint and kill those cells.
However, such vaccines will be expensive. “You basically have to make every vaccine from scratch. If this was not personalised, the vaccine could probably be made for pennies, just like the Covid vaccine,” said Dr Patrick Ott of Dana-Farber Cancer Institute in Boston.
The vaccines under development at UW Medicine are designed to work for many patients, not just a single patient. Tests are under way with early and advanced breast cancer, lung cancer and ovarian cancer. Some results may come as soon as next year.
Todd Pieper (56), from suburban Seattle, is participating in testing for a vaccine intended to shrink lung cancer tumours. His cancer spread to his brain, but he is hoping to live long enough to see his daughter graduate from nursing school next year.
“I have nothing to lose and everything to gain, either for me or for other people down the road,” Mr Pieper said of his decision to volunteer.
One of the first to receive the ovarian cancer vaccine in a safety study 11 years ago was Jamie Crase of nearby Mercer Island. Diagnosed with advanced ovarian cancer when she was 34, Ms Crase thought she would die young and had made a will that bequeathed a favourite necklace to her best friend. Now 50, she has no sign of cancer, and she still wears the necklace.
She does not know for sure whether the vaccine helped, “but I’m still here”. – AP
