Latest / Common Sense Health / Don't Fall For The Latest Cancer Claims
Transcript
- Stephen Thomas BSc. Hons: Hello again. If you have watched me before, you'll know that cancer is something that has touched my life quite deeply and very personally. I lost both my parents to cancer at a very early age and I lost a girlfriend to breast cancer when I was just 23 years old. So today I'm 62 and even though nearly 40 years have passed, I still feel that little flutter of hope whenever I see a headline about a potential cancer breakthrough. And I think most of us do. when you have lost people you love to this disease, hope is not a luxury. It feels almost like a duty. So when a short video appeared on my feed recently showing a Spanish scientist in a white lab coat with the words tumors eliminated on screen and nearly half a million likes, I obviously paid attention. And I want to talk to you today about what that video was actually showing, why it spread so fast and why the story did not hold up in the way that the headline suggested and maybe most usefully how to protect yourself from false hope the next time something similar crosses your feed or algorithm. Now, the paper behind the claim was published in December 2025, quite recent in a journal called PNAS or the Proceedings of the National Academy of Sciences, which is one of the most respected scientific journals in the world. Now, the research described a combination of three drugs that appear to produce dramatic regression of pancreatic tumours in mouse experiments. Now the lead scientist was Mariano Barbassid, a genuinely distinguished researcher based in Madrid at the Spanish National Centre for Cancer Research. The institution issued a press release and the internet does what the internet does. Here is where things get complicated because in April 2026, very recently, roughly four months after publication, PNAS formally retracted the paper. Not because the data was necessarily fabricated, but because several of the authors, including the senior author, had financial stakes in a start-up company connected to the very therapy being tested. And those stakes were not declared at the time of publication. Now that disclosure is not a technicality. It is the mechanism by which readers can assess whether a researcher has a financial reason to see their results in the best possible light. Now when it is missing, the editorial process has failed. and the paper has to come down. I want to be fair here. This does not mean Barb acid and his team were lying. It means a critical piece of information was withheld, deliberately, possibly or otherwise. And that changes everything about how a reader should have received the findings. Science depends fully on transparency. Now without it, even good data cannot be properly evaluated. So why did the video, for instance, get half a million likes before any of this came to light? Well, there's a few reasons and they are worth understanding because they come up time and time again. First, hope is a powerful amplifier. Pancreatic cancer is one of the most lethal cancers we know and survival rates are desperately low. When someone says we've eliminated the tumors, people are going to share it and they're going to tag their loved ones. The emotional response is completely understandable. And it is exactly what algorithms are designed to exploit. Engagement goes up, the wheel spreads further, and nobody stops to ask what model was used. Now, secondly, press releases are written to be picked up. Institutions are not evil for doing this because, remember, they're trying to communicate their researchers' work. But the language is often overly optimistic and the caveats are little bit buried. And journalists or content creators, under time pressure, lift the headline and just simply run with it. And thirdly, a short video simply cannot carry the nuance a scientific claim requires. 30 seconds of the reel, a lab coat, bold text, nice graphics, Now, let me explain the part of this story that I think is the most important for you as a viewer, the same as I am, and the thing that actually caught my attention when I first watched the reel. The mice in this study had human tumors injected into them. Now that might sound impressive, human tumours right there in the experiment, but it is actually a significant limitation. And here's why. Because this type of experiment is called a xenograft or xenograph, depending on where you live. And it means that human cancer cells are taken and implanted into a mouse. The researchers can then test whether a drug eliminates those cells in a living animal. Now that is useful information, but the mice used in these studies are typically deficient in the immune system. ⁓ It's deliberately suppressed or removed. so that it does not reject those foreign human cells. The moment you remove the immune system from the equation, you are no longer testing how a treatment would interact with a functioning human immune response. And for pancreatic cancer specifically, the immune environment around the tumor is one of the most important and most difficult factors to overcome in any real treatment. There is also a structural difference. Human pancreatic tumors are surrounded by extremely dense fibrous tissue called stroma. And that acts almost like a physical barrier, preventing drugs from getting through to the cancer cells. Now, mice models or mouse models, particularly xenografts, rarely replicate that barrier accurately. So a drug that races through mice tissues and reaches the tumor may struggle to do the same in a human being. And if we add to that the fact that mice metabolize, that is the process of breaking down stuff, they metabolize drugs very differently to humans and you start to see why a result that looks spectacular in a mouse may not actually translate into anything clinically meaningful for human patients. Now, I want to be very clear, mouse studies are not worthless. They are a necessary step. You would not want to jump straight into human trials without some evidence that a drug can do what it claims. there are... They are steps. No, they're not a destination. So here is my practical checklist. The questions you should ask the next time a headline tells you cancer has been cured or tumors have been eliminated. Firstly, what animal model was used? Was it a simple injected xenograft or something closer to the real human disease, like a genetically engineered mouse model where scientists actually give the mouse the genetic mutations that cause the cancer naturally or a patient derived xenograft where a real patient's tumour tissue is carefully grown and tested. The closer to human biology, the more convincing the evidence. Did the mice in the study have a working immune system? If not, that is a major flag. How many animals were in the study? Small numbers increase the chance that the result was a fluke. How long was the follow-up? Did tumours stay gone after treatment stopped or did they regrow? Were dose ranges and side effects reported? If not, we So none of this is about being cynical. It is about being kind to yourself and to the people you share this information with because false hope has a cost. It can lead patients and families to delay seeking realistic options. It can distort the conversation around what treatments are actually available. And when the correction inevitably comes, it erodes trust, not just in that one paper, but in science itself. Now, the media and well-meaning online influencers are not always villains in this story. Many of them are just as excited by hope as I was. and you would be possibly. But excitement without scrutiny is how half a million likes end up attached to a retracted paper. Now, if any of this resonates with you, if you want a space where we ask these kinds of questions without the noise and the drama, you could always consider joining my online community. There is a link in the description to this video. And also I have a Substack article which goes into this particular thing in more detail. So if you want to join my Substack, which is free to join, you'll see this article mentioned with links to all the studies and obviously a bit more nuanced than this very basic video. So remember, hope is a good thing, but informed hope is even better. I hope you enjoyed this video. And if you did and you're not subscribed, can you please consider subscribing? Please like and share if you think it's worth doing. If you did see the original reel and you're very excited, like I say, not being cynical, I'm just saying we need to know the full picture. before we get too excited and if you've got to the end of this video and you absolutely hated it ⁓ I'm sorry about that why don't you come back for another video see if I can do a better job next time anyway whatever the outcome thank you very much for watching