I haven't read much on this... just stuff like this:

Inhaling molecular hydrogen may improve the quality of life and control cancer progression for patients with advanced cancer. In vitro studies have shown that hydrogen treatment can inhibit cancer cell proliferation, invasion, migration, and colony formation. Hydrogen therapy may also improve liver function in patients receiving chemotherapy.

Therapeutic potential of molecular hydrogen in ...
The in vitro study showed that hydrogen treatment significantly inhibits cancer cell proliferation, invasion, migration and colony formation both in Hs38.T and ...

Translational Cancer Research
“Real world survey” of hydrogen-controlled cancer: a follow ...
Sep 23, 2019 — In patients with advanced cancer, inhaled hydrogen can improve patients' quality-of-life and control cancer progression. Hydrogen inhalation is ...

NCBI
Hydrogen-rich water exerts anti-tumor effects comparable to 5-fluorouracil ...
Jan 15, 2022 — For example, studies report that H2 therapy was associated with improved liver function in patients who were administered chemotherapy, as well as reduced side effects for those receiving radiation therapy, and protective effects against radiation-induced bone marrow damage in cancer patients[6-8].

ncbi.nlm.nih.gov
Hydrogen therapy may also reduce side effects for patients receiving radiation therapy. It may also protect against radiation-induced bone marrow damage.
Hydrogen therapy may also reduce inflammatory responses associated with ventilator-induced lung injury. In a study of allergic asthmatic mice, hydrogen gas inhalation improved lung function and protected against airway inflammation.
Hydrogen therapy may also have no common adverse reactions such as nose bleeding, chest pain, nausea, vomiting, dizziness, earache, or skin allergy.

So... where do you fit in with your use of this hydrogen therapy ... in terms of other treatments (combinations)?

Very curious. And, are you stage 4 and have already exhausted all other treatments?

Gary