Mar 9, 2026 · 2h 28m
Engineered T-cells and CRISPR technology revolutionize modern cancer treatment
Avoiding, Treating & Curing Cancer With the Immune System | Dr. Alex Marson
By programming the immune system to fight tumors, genetic engineering is shifting oncology from toxic treatments to precise, biological cures.
- 1Genetically engineered CAR T-cells can be programmed to recognize and destroy specific cancer cells with high precision.
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Dr. Alex Marson explains how CRISPR technology is used to precisely rewrite T-cell DNA for targeted cancer therapy.
The brief
Modern oncology is undergoing a quiet revolution as researchers move beyond chemotherapy to enlist the body's own immune system. Dr. Alex Marson explains how scientists are now reprogramming human cells to hunt down and destroy tumors.
At the center of this breakthrough are T-cells, the adaptive immune system's specialized warriors. By using CRISPR gene editing, scientists can rewrite DNA to create CAR T-cells, essentially supercharging them to target specific cancer proteins.
While these advanced immunotherapies offer unprecedented hope for curing once-terminal cancers, they also raise critical ethical questions. The ability to edit human DNA brings a responsibility to carefully navigate the boundaries of heritable gene editing.
Beyond high-tech clinical interventions, daily lifestyle choices remain a foundational defense. Simple, actionable habits significantly support innate immunity and lower the baseline risk of developing cellular mutations in the first place.
What was said on this episode
42 statements · 21 positive · 18 negative · 3 neutral
CAR T cells can direct T cells against cancer cells
“those cars are directed to go against cancers”
Listen at 0:00
Modern medicine can program cell behavior more precisely than before
“medicine is programming the behavior of cells in a way that's much more directed than was ever conceivable before”
Listen at 3:01
Thymic negative selection eliminates T cells recognizing self targets
“If the T cell engages a natural target in the thymus, those cells will die”
Listen at 11:04
B cells produce antibodies while coordinating with T cells
“B cells are this other type of lymphocyte that work in coordination with T cells and they're the antibody producing cells”
Listen at 12:50
A high-fat diet qualitatively changes inflammatory responses in obese mice
“The actual type of inflammation, the cell responses were different in the mice eating a high fat”
Listen at 16:41
Allergy-blocking antibodies may fail in obese, high-fat-diet mice
“The normal diet mice would respond favorably to these. They didn't help the mice that had the obese high fat diet response to inflammation.”
Listen at 16:41
Peanut exposure can benefit people who are not yet allergic
“There is strong evidence that exposure to peanuts can be beneficial in people who are not yet allergic”
Listen at 21:29
Early exposure to certain substances helps maintain immune tolerance
“critical early exposure is part of how tolerance is maintained”
Listen at 21:29
Autoimmune disease emerges when immune self-tolerance mechanisms fail
“autoimmune diseases emerge when those normal checks fail”
Listen at 23:22
Autoimmune therapies should control immune activity
“our goal therapeutically with drugs is to make sure that we make the immune system under control”
Listen at 23:22
Cytokines can produce systemic effects such as fever
“the cytokines can do can influence, can cause the development of fever”
Listen at 26:23
Antibiotic overuse could undermine future antibiotic effectiveness
“if we overuse them, that window of human history might come to an end”
Listen at 29:01
Effective antibiotics can cure susceptible bacterial infections
“Antibiotics, when they're used for bacterial infections that are susceptible to them, are a miracle”
Listen at 29:01
Cancer is a genetic disease involving loss of cellular growth regulation
“It's genetic disease where cells lose the normal regulation and are dividing out of control in various tissues”
Listen at 31:22
Smoking increases lung-cell DNA damage and mutation rates
“smoking causes chemicals to go into your lungs, the lung cells get exposed to these chemicals that then cause higher amounts of DNA damage, more mutations”
Listen at 35:17
BRCA mutations predispose people to breast and other cancers
“people will likely have heard of the brca or the BRCA genes which predispose to breast cancer and other types of cancer”
Listen at 35:17
Ultraviolet exposure increases DNA damage in skin cells
“UV is a risk factor for DNA damage in the skin”
Listen at 37:52
Inherited BRCA mutations substantially increase individual cancer risk
“if you inherit a BRCA mutation as an individual, you have a very high risk of developing cancer”
Listen at 38:54
BRCA testing is recommended when there is a family cancer history
“That's certainly recommended. If there's a family history of cancer for BRCA mutations”
Listen at 39:26
Mutagens almost inevitably increase cancer risk by increasing mutations
“by virtue of the fact that you're causing more mutations, almost inevitably you're also increasing the risk of cancer”
Listen at 45:26
Meat may increase colorectal cancer risk
“meat in general has been implicated as a potential carcinogen, especially in colorectal cancer”
Listen at 46:02
Checkpoint inhibitors can unleash T cells against some cancers
“for certain types of cancer, it's been absolutely miraculous that if you make a drug that hits the brake on the T cells, the T cells go stronger and they can be unleashed against cancer”
Listen at 51:33
Cancer cells can rapidly evolve resistance to targeted therapies
“Cancer cells can evolve quickly and can become resistant to these targeted modifications”
Listen at 51:33
CAR T-cell therapy has succeeded against some leukemias and lymphomas
“This has been done for certain types of leukemia and lymphoma, and there's been these amazing success stories”
Listen at 54:16
Most cancers become more common later in life
“most cancers, as you said. Exactly as you said, that there's this sort of increase, and they're largely disease of later stages of life”
Listen at 1:03:25
CD19 is present on many B-cell leukemias and lymphomas
“CD19 is found on the surface of many a large number of different types of B cell leukemias and lymphomas”
Listen at 1:04:31
Cancer immunotherapy research seeks targets selective to cancer cells
“people are thinking about more and more sophisticated ways to look for these targets that are selectively found on the cancer cell and not on the healthy cell”
Listen at 1:05:16
CRISPR base editors can change nucleotides without double-strand breaks
“CRISPR base editors that doesn't introduce a double stranded break, but actually changes nucleotides in a more predictable way”
Listen at 1:17:37
CRISPR editing has become increasingly precise at targeted genomic sites
“we've gotten quite good at getting more and more precise to say, okay, we're making these high fidelity cuts at one place”
Listen at 1:17:37
Engineered viral tropism can target delivery to specific cell types
“People have really advanced engineered tropism, engineering what cells a virus will deliver material to. And that can be dialed in quite precisely now”
Listen at 1:34:56
Lipid nanoparticles can generate CAR T cells in vivo in models
“They can actually make these car T cells by injecting lipid nanoparticles into the body without ever taking the T cells out of the bloodstream”
Listen at 1:37:00
Lipid nanoparticles preferentially reach the liver after injection
“lipid nanoparticles naturally tend to go to the liver”
Listen at 1:37:00
Antibody-drug conjugates deliver toxic agents selectively to targeted cells
“People have then developed what's called antibody drug conjugates”
Listen at 1:50:52
AI models can design synthetic proteins targeting cancer-cell surface molecules
“people are increasingly using AI models to design a synthetic protein that doesn't even exist in nature, that is designed to recognize and stick to something on the surface of cancer cell”
Listen at 1:54:13
Human germline edits should not be introduced into future generations
“we should have a line in the sand where we do not introduce genetic edits that will be passed on to the next generation”
Listen at 2:02:21
Editing offspring would cause greater societal losses than benefits
“I don't think we gain enough to come close to what we would lose as a society if we embark on that journey of editing offspring”
Listen at 2:04:17
Embryo genetic sequencing overpromises predictive certainty for many traits
“there's a lot that become probabilistic and statistical and I think we're over promising what can be delivered”
Listen at 2:06:57
CAR T cells can eliminate disease-contributing B cells in autoimmunity
“the same CAR T cells that are being used to get rid of B cell leukemias are also getting rid of B cells which are contributing to autoimmune disease”
Listen at 2:11:26
Fibromyalgia remains poorly understood and its cause is unknown
“we just have not figured out what it really is, what causes it”
Listen at 2:12:26
Large-scale CRISPR screens can map gene effects in primary human immune cells
“we just released 22 million cells where each one has a different CRISPR gene inactivated”
Listen at 2:12:26
People should not bank T cells preemptively
“it's not something that I would tell people to go out and do. It's not something I'm doing”
Listen at 2:18:00
Induced pluripotent stem cells could provide an effectively limitless T-cell supply
“imagining how these IPS cells could be made into T cells which would essentially create a limitless supply of T cells”
Listen at 2:20:00
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