Fact check: Scientists achieved 100% tumor elimination in mice with colorectal tumors using a single injection of Ewingella America…

Verdict: verified — Trust Score 90/100

The TikTok post accurately describes a recent scientific breakthrough where Ewingella Americana bacteria, found in Japanese tree frogs, demonstrated 100% tumor elimination in mice with colorectal cancer. The bacteria target cancer cells, thrive in low-oxygen environments, and trigger a strong immune response, outperforming leading cancer treatments and creating immune memory. This information is confirmed by 3 reliable sources.

Platform
tiktok
Source author
drbenmiles — see all fact-checks of this account
Original post
https://vm.tiktok.com/ZN81CpV1U/
Verified on
July 20, 2026
Verification ID
YBRzUezaAtFKycO67MENqA

Original content reviewed

Platform: TIKTOK Author: @drbenmiles --- Caption/Description --- Not a bad way to spawn a whole new field of oncology 🐸 💊 #medicine #discovery #cancerresearch #breakthrough #sciencetok #fyp --- Audio Transcript (What was said) --- Scientists just killed 100% of tumors with a single injection of bacteria from a frog. A genuine amphibious assault. Many tumors fly under the immune system's radar because they're made of the body's own cells. But a bacterial infection is unmistakably foreign, and it drags immune cells straight to wherever it's happening. Which makes us ask the question, what if you could get bacteria to target cancer cells? To hijack this idea, a team at Japan's Advanced Institute of science and technology went with their gut instinct, screening 45 bacterial strains pulled from Japanese tree frogs, fire belly newts, and grass lizards. They found that most of them were neutral, but nine killed cancer cells, and one took tadpole position. E. Americana, a bacterium naturally occurring in the gut of Japanese tree frogs. When the team injected E. Americana into the bloodstream of mice with colorectal tumors, the tumor's own leaky blood vessels let the bacteria slip out of circulation and into the tumor site itself. There, because the tumor produces a protein called CD47, which suppresses local immune defenses and helps the tumor go unnoticed, it also meant that the bacteria could evade the body's immune response and establish a colony undisturbed. The center of the tumor is also typically low in oxygen because it's isolated from the local blood supply. But this bacterium thrives on low oxygen environments, so it burrowed its way into the tumor's core and began feeding on the tumor's metabolic byproducts, increasing in No. 3,000 fold within the first 24 hours. But it didn't take this long for the body to notice it. Just six hours after infection, an army of immune cells were already on their way to the tumor site. Neutrophils arrived first, engulfing and d

Claims analyzed (6)

  1. verified: Scientists achieved 100% tumor elimination in mice with colorectal tumors using a single injection of Ewingella Americana bacteria from Japanese tree frogs.
    Multiple sources confirm that a research team at the Japan Advanced Institute of Science and Technology (JAIST), led by Professor Eijiro Miyako, discovered that Ewingella americana bacteria, isolated from Japanese tree frogs, achieved a 100% tumor elimination rate in mice with colorectal cancer after a single intravenous injection.
  2. verified: The bacteria, Ewingella Americana, naturally occurring in the gut of Japanese tree frogs, were injected into the bloodstream of mice with colorectal tumors.
    Research indicates that Ewingella Americana is a naturally occurring bacterium found in the intestines of Japanese tree frogs. Scientists isolated this bacterium and administered it via intravenous injection into mice with colorectal tumors.
  3. verified: The bacteria thrived in the low-oxygen environment of the tumor core and increased 3,000-fold within 24 hours.
    Sources confirm that Ewingella Americana is a facultative anaerobic bacterium, meaning it thrives in low-oxygen environments, such as the tumor core. Studies showed that the bacterial population increased approximately 3,000-fold within 24 hours after intravenous administration, demonstrating efficient tumor accumulation and rapid intratumoral proliferation.
  4. verified: The treatment led to an immune response, with neutrophils, T cells, and B cells attacking both the bacteria and cancer cells.
    Research indicates that Ewingella Americana stimulates the immune system, attracting immune cells such as T cells, B cells, and neutrophils to the tumor, which then attack both the bacteria and cancer cells. This dual-action mechanism contributes to comprehensive tumor destruction.
  5. verified: The single dose of Ewingella Americana outperformed leading cancer immunotherapy drugs and standard chemotherapy in tumor elimination.
    Studies show that a single intravenous administration of Ewingella Americana achieved complete tumor elimination in mice, dramatically surpassing the efficacy of current standard therapies, including immune checkpoint inhibitors (anti-PD-L1 antibody) and liposomal doxorubicin (chemotherapy agents).
  6. verified: Mice treated with Ewingella Americana developed an immune memory, rejecting new cancer cells re-injected after initial tumor elimination.
    Tumor rechallenge experiments demonstrated that mice cured with Ewingella Americana completely rejected new cancer cells when re-exposed, indicating the development of durable antitumor immunity with immunological memory.

Sources consulted (16)

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