A nonmainstream approach against cancer.

Area of Science:

• Oncology
• Cancer Biology
• Drug Discovery

Background:

• The 'magic bullet' theory, inspired by antibiotic success, has largely failed in cancer treatment over 60 years.
• Tumor microenvironments are acidic, hindering drug efficacy and isolating tumors.
• Cancer cells exhibit unique metabolic adaptations, differing from normal cellular homeostasis.

Purpose of the Study:

• To explore non-mainstream approaches to cancer treatment.
• To investigate the role of tumor acidity and proton pumps in cancer.
• To identify novel cancer cell behaviors and potential therapeutic targets.

Main Methods:

• Investigated the anti-tumor effects of proton pump inhibitors (PPIs) in acidic tumor microenvironments.
• Analyzed cancer cell metabolism, including fermentation and 'cannibalism' of other cells.
• Identified a novel oncogene, TM9SF4, shared with amoebas.
• Studied the role and potential of extracellular vesicles (EVs) released by tumor cells.

Main Results:

• Proton pump inhibitors (PPIs) demonstrate potent anti-tumor effects by targeting proton pumps in acidic tumor cells.
• PPIs are activated by acidity, offering a unique therapeutic mechanism.
• Cancer cells exhibit 'cannibalistic' behavior, fueled by fermentation, and express the amoeba-like oncogene TM9SF4.
• Tumor-derived extracellular vesicles (EVs) show potential as biomarkers and drug delivery vehicles.

Conclusions:

• Tumor acidity presents a therapeutic vulnerability exploitable by PPIs.
• Cancer cells possess unique survival mechanisms (fermentation, cell cannibalism) offering new therapeutic targets.
• Extracellular vesicles (EVs) represent promising avenues for cancer diagnostics and therapeutics.
• A paradigm shift towards treating tumors as common biological features rather than specific molecular targets is proposed.