This news circulates on social media with the headline "Mexican scientist completely eliminated HPV" and generates excitement. Rightfully so, because HPV is responsible for 99 percent of cervical cancers and over 300,000 women worldwide die from this disease annually. But understanding what this news actually conveys, what was achieved, and what wasn't requires digging deeper.
Eva Ramón Gallegos is a serious researcher working in biomedical sciences and nanobiotechnology at Mexico's National Polytechnic Institute (IPN). She has been studying photodynamic therapy (PDT) for over 20 years. This isn't a "miracle cure" claim but a long-term research program published in peer-reviewed journals with traceable methodology (1).
How does photodynamic therapy work? The mechanism is elegant and biochemically logical. Delta-aminolevulinic acid (5-ALA) is applied to the cervix. This substance is a naturally occurring amino acid and precursor in the heme biosynthesis pathway. Within approximately 4 hours, it converts to protoporphyrin IX (PpIX) in cells. The beauty is this: cancer and precancerous cells, due to their disrupted metabolism, accumulate this substance far more than normal cells. When light of a specific wavelength is then applied, the accumulated PpIX produces reactive oxygen species and selectively destroys these cells (2).
The difference from chemotherapy emerges here: while chemotherapy attacks healthy and diseased cells indiscriminately, PDT targets only abnormal cells. Moreover, it doesn't threaten fertility because it preserves cervical structure. Surgical procedures like LEEP or conization remove tissue from the cervix and increase preterm birth risk; PDT doesn't (3).
Now let's look at the numbers. Gallegos' 2023 study published in Photochemistry and Photobiology included 29 women. In these women diagnosed with CIN I (cervical intraepithelial neoplasia grade 1) and/or HPV, HPV infection was eliminated at 100 percent after 6 months (p<0.01). Clearance rate for CIN I HPV combination was 64.3 percent, for CIN I alone 57.2 percent (4). The 2017 earlier study reported 80-83 percent clearance rates for HPV-16 and HPV-18 infections in 30 women (5).
These numbers appear impressive. But scientific evaluation requires asking several critical questions.
First: was there a control group? The 2023 study has no placebo or untreated control group. This is a major methodological deficiency because we know the natural course of HPV infections. Literature data shows that 80-90 percent of high-risk HPV infections spontaneously clear by the immune system within 18-24 months (6). 57-80 percent of CIN I lesions can regress without treatment (7). So when evaluating the "100 percent HPV elimination" figure, we cannot distinguish how much was due to treatment versus natural regression.
Second: sample size. 29-30 women isn't sufficient to prove a treatment's efficacy. From a statistical power analysis perspective, results obtained from such small samples cannot be generalized to larger populations. This is why the scientific community demands phase 3 clinical trials (8).
Third: long-term follow-up. 6-12 month follow-up isn't sufficient to determine whether HPV was permanently eliminated. Recurrence rates should be evaluated with 5-10 year monitoring.
But here's where the story gets interesting: there's a large-scale phase 3 randomized controlled trial published in 2025. Hexaminolevulinate-based PDT called APL-1702 was tested in 402 women. Results: 41.1 percent response rate in treatment group, 21.7 percent in placebo group (p<0.001). HPV 16/18 clearance rates were 31.4 percent in treatment group, 15.4 percent in placebo (p=0.011) (9). This study shows PDT is significantly superior to placebo but far from the 100 percent figures Gallegos reported.
Snopes verified this news as "TRUE," but what was verified wasn't "Mexican researcher developed a treatment that completely eliminates HPV" but rather "Eva Ramón Gallegos and her team have been working on photodynamic therapy for 20 years and achieved promising results" (10). There's a significant difference between the two.
Is this research worthless then? Absolutely not. PDT's potential in cervical lesions is real. Being minimally invasive, preserving fertility, and being repeatable are important advantages. Gallegos' work is pioneering in this field and lays groundwork for larger studies. But the headline "completely eliminated HPV" is an exaggeration not supported by the current evidence base.
Eva Ramón Gallegos is a serious scientist and her work is valuable. Photodynamic therapy is a promising approach for cervical precancerous lesions. But the data we currently have isn't sufficient to call this a "definitive cure." Larger, randomized, controlled studies with long-term follow-up are needed. This is how science works: promising findings, rigorous verification, gradual progress. Not miracle headlines.
Sources:
1-ResearchGate. Eva Ramon-Gallegos Research Profile. National Polytechnic Institute, Mexico City.
2-Malik Z, et al. Fundamentals of 5-aminolevulinic acid photodynamic therapy and diagnosis: An overview. Transl Biophotonics. 2020;2(1-2):e201900022.
3-Therapeutic Advances in Chronic Disease. Photodynamic therapy of cervical cancer: a scoping review on the efficacy of various molecules. PMC. 2024.
4-López-Cárdenas S, et al. Elimination of Human Papillomavirus and Cervical Pathological Microbiota with Photodynamic Therapy in Women from Mexico City with Cervical Intraepithelial Neoplasia I. Photochem Photobiol. 2023.
5-Maldonado Alvarado E, et al. Effectiveness of Photodynamic Therapy in Elimination of HPV-16 and HPV-18 Associated with CIN I in Mexican Women. Photochem Photobiol. 2017;93(5):1269-1275.
6-PMC. Human papillomavirus persistence or clearance after infection in reproductive age. 2022.
7-PMC. Low-Grade Cervical Intraepithelial Neoplasia (CIN1) Evolution. 2023.
8-PMC. Efficacy and safety of photodynamic therapy for cervical intraepithelial neoplasia and human papilloma virus infection: A systematic review and meta-analysis. 2018.
9-ScienceDirect. Photodynamic therapy for high-grade squamous intraepithelial lesions: A randomized controlled trial. 2025.
10-Snopes. Did a Mexican Researcher Develop a Potential Treatment for HPV? February 2019.