Can Oxygen Therapy Improve Cancer Treatment?

Possibly, as an add-on. This review from Expert Review of Anticancer Therapy notes that tumor oxygenation has been shown to inhibit cancer growth and strengthen chemoradiotherapy in animal experiments and the clinic. The authors propose that combining oxygen therapy with immunotherapy could become a highly effective approach, but that combination is still an idea, not a tested treatment.

Tumors often grow faster than their blood supply, creating regions of low oxygen (hypoxia). This hypoxic environment helps cancer cells survive and resist treatment. Oxygenating tumors may reverse these advantages.

Key Findings

Why Hypoxic Tumors Are More Dangerous:

Hypoxic (low-oxygen) tumor environments contribute to cancer progression
Cancer cells shift their metabolism in ways that help them survive low oxygen
These metabolic changes weaken the tumor’s antioxidant defenses
Hypoxic tumors resist standard treatments more effectively

How Oxygen Therapy Is Delivered:

Water-soluble ozone therapy
Hyperbaric oxygen therapy (HBOT)

What Tumor Oxygenation Accomplishes:

Inhibits tumor growth
Enhances anti-tumor effects of chemoradiotherapy
Potentiates blood vessel occlusion therapies
Improves outcomes in both animal experiments and clinical settings

The Immunotherapy Connection: Reactive oxygen species (ROS) powerfully influence both innate and adaptive immunity. The researchers propose combining oxygen therapy with:

Immune checkpoint inhibitors
Drug-induced immunostimulation
Adoptive cell therapy
Hyperthermia (heat therapy)

Dr. Kumar’s Take

This perspective article highlights an underappreciated aspect of cancer treatment: the importance of tumor oxygen levels. The logic is straightforward. Cancer cells in hypoxic environments are harder to kill. Oxygenating these tumors removes a key survival advantage.

The more speculative part is the proposed combination with immunotherapy. Reactive oxygen species affect immune cell function, so pairing oxygen therapy with checkpoint inhibitors or adoptive cell therapy might add to their effects. That is the authors’ expert opinion, and it still needs clinical trials.

The Science Explained Simply

Why Tumors Become Hypoxic: Tumors grow rapidly. They quickly outgrow their blood supply. Without adequate blood vessels, oxygen can’t reach the center of the tumor mass. These hypoxic regions become sanctuaries where cancer cells survive treatments.

How Cancer Cells Adapt: Cancer cells switch to a different metabolism (increased glycolysis, hampered Krebs cycle). This allows them to survive on less oxygen but weakens their ability to handle oxidative stress.

Why Oxygen Therapy Helps: When you deliver high concentrations of oxygen, these adapted cancer cells face a challenge they’re not prepared for. Their weakened antioxidant defenses make them vulnerable to the reactive oxygen species that oxygen therapy generates.

Combining with Other Treatments

With Chemoradiotherapy: Both chemotherapy and radiation work better when tumors are well-oxygenated. Many cancer-killing mechanisms require oxygen. Hypoxic regions resist these treatments.

With Blood Vessel Occlusion: Some treatments try to cut off the tumor’s blood supply. The authors note that tumor oxygenation could enhance these effects.

With Immunotherapy: This is where the authors see the most promise. Immune cells need to function properly to attack tumors, and reactive oxygen species influence both innate and adaptive immunity. The combination is a proposal that has not yet been tested in trials.

Practical Takeaways

Tumor hypoxia contributes to cancer progression and treatment resistance
Oxygen therapy can inhibit tumor growth in animal and clinical studies
Water-soluble ozone and hyperbaric oxygen therapy are the usual clinical methods for tumor oxygenation
Combining oxygen with chemoradiotherapy enhances anti-tumor effects
Oxygen therapy combined with immunotherapy shows theoretical promise

FAQs

How does oxygen therapy kill cancer cells?

The proposed mechanism is that oxygen therapy generates reactive oxygen species (ROS) in the tumor. Cancer cells that have adapted to low-oxygen environments have weakened antioxidant defenses. This may make them more vulnerable to ROS-induced damage. Additionally, many standard treatments (chemotherapy, radiation) work better when tumors are well-oxygenated.

Is hyperbaric oxygen therapy used for cancer now?

Hyperbaric oxygen therapy is FDA-approved for certain uses, including helping radiation injuries heal. Its use specifically to enhance cancer treatment is still being studied. The approach described in this article, combining HBOT with immunotherapy, represents a future direction rather than current standard practice.

Could oxygen therapy replace chemotherapy?

No. This review discusses oxygen therapy as an adjunct to conventional treatments, not a replacement. The authors propose combining oxygen therapy with chemoradiotherapy and immunotherapy to enhance their effects. It should be considered a potential addition to comprehensive cancer treatment, not a standalone cure.

Bottom Line

This review from Expert Review of Anticancer Therapy makes a case for oxygen therapy in cancer treatment. Tumor oxygenation has been shown to inhibit cancer growth and enhance the effects of chemoradiotherapy in both animal experiments and clinical settings. The authors propose that combining oxygen therapy with immunotherapy could create a “highly-effective clinical biological approach to cancer treatment” by leveraging the profound influence of reactive oxygen species on both innate and adaptive immunity. The immunotherapy pairing remains a proposal that needs clinical trials.

Read the full study