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Explanation to why immunotherapies don't work on hardest-to-treat breast cancers - Video

Published On 2022-12-17T09:45:01+05:30  |  Updated On 19 Dec 2022 4:14 PM IST
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Overview

The process of surviving chemotherapy triggers a program of immune checkpoints that shield breast cancer cells from different lines of attack by the immune system. It creates a "whack-a-mole" problem for immunotherapy drugs called checkpoint inhibitors that may kill tumor cells expressing one checkpoint but not others that have multiple checkpoints, according to a new study published in the journal Nature Cancer.

Thanks to advances in cancer therapies, most forms of breast cancer are highly treatable, especially when caught early.

But the last frontier cases - those that can't be treated with hormone or targeted therapies and don't respond to chemotherapy - remain the deadliest and hardest to treat. Tulane University researchers have discovered for the first time how these cancers persist after chemo and why they don't respond well to immunotherapies designed to clear out remaining tumor cells by revving up the immune system.

"Breast cancers don't respond well to immune checkpoint inhibitors, but it has never really been understood why," said corresponding author James Jackson, PhD, associate professor of biochemistry and molecular biology at Tulane University School of Medicine. "We found that they avoid immune clearance by expressing a complex, redundant program of checkpoint genes and immune modulatory genes. The tumor completely changes after chemotherapy treatment into this thing that is essentially built to block the immune system."

Researchers studied the process in mouse and human breast tumors and identified 16 immune checkpoint genes that encode proteins designed to inactivate cancer-killing T-cells.

"We're among the first to actually study the tumor that survives post-chemotherapy, which is called the residual disease, to see what kind of immunotherapy targets are expressed," said the study's first author Ashkan Shahbandi, an MD/PhD student in Jackson's lab.

The tumors that respond the worst to chemotherapy enter a state of dormancy - called cellular senescence - instead of dying after treatment. Researchers found two major populations of senescent tumor cells, each expressing different immune checkpoints activated by specific signaling pathways. They showed the expression of immune evasion programs in tumor cells required both chemotherapy to induce a senescent state and signals from non-tumor cells.

They tested a combination of drugs aimed at these different immune checkpoints. While response could be improved, these strategies failed to fully eradicate the majority of tumors.

"Our findings reveal the challenge of eliminating residual disease populated by senescent cells that activate complex immune inhibitory programs," Jackson said. "Breast cancer patients will need rational, personalized strategies that target the specific checkpoints induced by the chemotherapy treatment."

Reference:

Breast cancer cells survive chemotherapy by activating targetable immune-modulatory programs characterized by PD-L1 or CD80,Nature Cancer,DOI: 10.1038/s43018-022-00466

Speakers

Isra Zaman

B.Sc Life Sciences, M.Sc Biotechnology, B.Ed

Isra Zaman is a Life Science graduate from Daulat Ram College, Delhi University, and a postgraduate in Biotechnology from Amity University. She has a flair for writing, and her roles at Medicaldialogues include that of a Sr. content writer and a medical correspondent. Her news pieces cover recent discoveries and updates from the health and medicine sector. She can be reached at editorial@medicaldialogues.in.

Dr. Kamal Kant Kohli

Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751
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