Every cell in your body maintains a specific voltage across its membrane — a kind of electrical address that changes throughout the cell’s life and varies between cell types. Normal differentiated cells are generally hyperpolarized, sitting at resting potentials between -50 and -90 millivolts. Cancer cells, almost universally, are depolarized. Their resting potential is closer to -10 or -20 millivolts. This isn’t a side effect of cancer — growing evidence suggests it may be a cause, or at least a critical enabler.
The observation is not new. Abnormal bioelectricity in tumor cells was noted as early as the 1970s. What is new is the mechanistic understanding — and the therapeutic hypothesis that follows from it.
The Bioelectric Hallmarks of Cancer
In 2023, a comprehensive review in Nature Reviews Cancer catalogued the bioelectric changes consistently observed across cancer types: membrane depolarization, altered gap junction connectivity that isolates tumor cells from normal tissue communication, and changes in the extracellular electric field that reorganize tumor cell migration. These changes aren’t random — they appear in predictable patterns that precede histological signs of malignancy in some tissue types.
Bioelectric Cancer Research
- →−10 to −20 mV — typical resting potential of cancer cells (vs. −50 to −90 mV in normal cells)
- →Tumor Treating Fields (Optune) — already FDA approved for glioblastoma using AC electric fields
- →3 studies showing restored membrane potential reverses melanoma cell behavior in vitro
- →Galvanotaxis — cancer cells migrate toward cathodes; external fields redirect metastatic movement
Can You Reprogram Cancer Electrically?
Michael Levin’s lab at Tufts and Mustafa Djamgoz’s group at Imperial College London have both demonstrated in cell culture that pharmacologically hyperpolarizing cancer cells — restoring their resting potential toward normal values — causes them to re-differentiate, slow their proliferation, and in some cases undergo apoptosis. The cells don’t need to be killed; they need to be reminded what they are.
What This Means For The Future
Bioelectric cancer therapy is not yet a clinical reality beyond Tumor Treating Fields, but the scientific foundation is accelerating rapidly. The appeal is obvious: a therapeutic approach that works by restoring normal bioelectric state rather than poisoning cells could be dramatically less toxic than conventional chemotherapy, and could be delivered non-invasively through external electric field devices. Whether the in vitro results translate to tumors in living organisms remains to be proven — but the hypothesis is now serious science.
Source: Levin & Bhattacharya, Nature Reviews Cancer (2023) · Djamgoz Lab, Imperial College London
Credit: National Institute of Allergy and Infectious Diseases on Unsplash