This Isn’t Hype: The Real Evidence on Doxycycline and Cancer

Doxycycline and cancer: what animal and human studies actually show.

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Episode Description:

You may have heard that doxycycline — yes, the common antibiotic — can help fight cancer.

It’s cheap.
It’s widely available.
Some studies look promising.

But here’s the question that matters:

Does it actually improve outcomes in real cancer patients?

In our newest post, Dr. Chaplin walks through:

• Why doxycycline targets cancer stem cells and metastases
• Where the human data looks encouraging
• Where it doesn’t
• How to minimize damage to normal healthy cells
• And one important chemotherapy combination you should be cautious about

There may be benefit here — but only if you understand how to use doxycycline correctly.

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info@elevatingcancertreatment.com

https://elevatingcancertreatment.com

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Disclaimer:
The information provided in this podcast is for educational and informational purposes only, and does not constitute medical advice. It is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have heard or read in this podcast or on this channel.
Reliance on any information provided by Dr. Jay Chaplin or Elevating Cancer Treatment is solely at your own risk. Dr. Jay Chaplin is a scientist and drug developer, not a medical doctor providing patient care. The content presented here reflects general scientific understanding and research, and may not be applicable to your individual health circumstances. Individual medical conditions and treatments vary, and no two situations are exactly alike.
Always consult with your personal healthcare provider before making any decisions about your health or treatment plan.

Transcript

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If you've just been diagnosed with cancer, or if you're in the thick of treatment, or if you're post-treatment and trying to prevent recurrence, you're probably trying to figure out what you can do to get an edge on your treatment and have this go away and never come back. If so, you've likely heard about doxycycline, an antibiotic commonly prescribed, commonly used, and its anti-cancer efficacy. A lot of people are taking it, and a lot of people have very high hopes. How much should you take? Does it work? How long do you have to take it? What are the dangers? If you want to know any of these things, listen till the end because we've got some good information for you today. Hello, and welcome to Elevating Cancer Treatment, where we explain the science and debunk myths to help you navigate your health journey. My background is a little different. Beyond educating about cancer, I'm actually designing new drugs that are defining the future of oncology. This direct hands-on experience offers me a very different perspective of how these cancer treatments work on the body, interact with the cancer cells, and cause side effects. And these are insights that I'm excited to share with you. If that sounds interesting, make sure to like this video, subscribe to the channel, and hit that notification bell so you never miss an update. And please share it if you find it useful. I'm Dr. Jay Chaplin. An important reminder, I'm a PhD, not an MD. The information in this video is education and it's not medical advice. Every cancer is unique and no general information applies to everyone. Please remember that. Always consult with your healthcare provider for guidance on your specific situation. And two quick things. First, as a thank you for being here, I've created a free resource, 10 things to elevate your chemo journey, which you can download from the link below. And second, by signing up, you'll also get updates on that innovative cancer treatment I'm working on. I'm confident it represents a significant advancement in immunotherapy. So please take a moment, download your free guide, and join us in shaping the future of cancer treatment. So we're going to start off with what is doxycycline? Doxycycline is a tetracycline family antibiotic. It's old, it's cheap, it's generic, you can get it almost anywhere, and we have a really good safety profile for it. We know how doxycycline acts. So, why does it potentially work on cancer cells? Doxycycline, as an antibiotic, stops protein synthesis in bacteria. But the mitochondria inside of all of your cells, including cancer cells, are very similar to bacteria. They actually were bacteria at some point. They fused with our cells and became mitochondria. And so when you take doxycycline, it actually slows down and slightly damages mitochondria. Now, mitochondria can heal from that, but it does stress out cells in the process. And again, just like with chemo drugs, normal cells adapt to the stress, slow down, take care of themselves. Cancer cells aren't good at that, and that stress becomes another factor that can lead to their being killed. Doxycycline appears to work well with chemotherapy. We'll talk about that more in a moment. So, this idea that you can take doxycycline, an antibiotic, something that we know is generally fairly safe, and use it to stress out your cancer and get a better cancer treatment, is not new, it's been around for quite a while. Does it work? That depends on what you look for. Again, as always, cell line studies are fantastic. That's not a surprise. Everything works in cell line studies. And from those cell line studies with very high concentrations of doxycycline, there are dozens of different mechanisms that they pull out. Because when you give enough of a compound to seriously poison a cell in culture, you get all sorts of effects. But what actually happens in the body? Let's go back to that. So, what's been shown in combination cell culture studies, or better yet, in mouse studies? It's been shown that giving doxycycline along with many forms of chemo gives better treatment efficacy. That's great. Unfortunately, we'll come back to this at the end, one of the ones that this is best shown for is the combination of doxycycline and doxorubicin or adriamycin. That's a particularly scary combination. We'll come back to that again at the end. Another thing that doxycycline seems to be good for is reintroducing chemotherapy sensitivity. If cell lines were taken, made resistant to chemotherapies like gemcidabine, and then given gemocidabine and doxycycline, the gem cytopine starts working again. Again, with that stress on the mitochondria, it makes it easier to kill off those cells. So that's a great thing. If we can prevent chemotherapy resistance, that is a fantastic thing as well. But again, these are in primarily cell line studies. Animals are better. What do we see with animals? In animals, we see in osteosarcoma trials that there was a significant reduction in metastases, there was a significant reduction in engraftment when cells were put into the animal, those cells didn't implant and form tumors in the first place, and that once you let tumors form and then treated with chemotherapy and doxycycline, that there was a significant survival benefit. The animal survived longer. Now, anytime you have an animal model, you have to wonder a bit about whether that's real or not. So, when we pivot to human clinical trials, what do we see? Human clinical trials we see some very different things. We'll come back to the bone matz issue in just a moment. Where this started was retrospective studies going back and looking at certain cases of lymphoma where there were also bacterial infections, and doxycycline was given as a way to get rid of the bacterial infections. When those bacterial infections were treated with doxycycline, those patients lived longer. There was an overall survival benefit. And that overall survival benefit wasn't pegged to curing the bacterial infection. It was something else, probably the doxycycline. And so that got people excited. But these are not well controlled, there are lots of different things that are going on. It could be that those patients actually got treated better, they saw the doctors more often, and there was other supportive care. So while that's important and it's interesting, it's not necessarily convincing. There was a clinical trial looking at bone metastases and whether bone metastases from breast cancer could be prevented or severity reduced with doxycycline. So this is very similar to that animal study that I just told you about a few minutes ago, where the animals were implanted with cancer cells, they were allowed to form bone metastases, and then the animals were treated with doxycycline. Very similar type of approach. However, in this case, in human beings, there were excellent markers for preventing bone damage. Everything looked good from the blood work, but there was no actual difference in the number of bone metastases, the severity of bone metastases, or overall survival. So all of the three things that you would look for, and all of the three things that looked so good in the animal study didn't come out with the human clinical trial. Now, why might that be? One particular issue here is in the animal study, those animals were not pretreated, and the cancer cell lines that were given to the animals were not heavily pretreated. In the clinical trial with the human patients, these were all people who already had bone metastases and they were looking for whether they worsened or whether they formed more bone metastases. And all of these people had already been treated for bone issues and had been heavily pretreated for cancer. So these are folks who were very far along in their progression, and they were being treated with doxycycline at the end of that time. And it didn't show a benefit. As a different approach, there was a very early clinical study, not even a phase one, this is an early study looking at breast cancer patients where biopsies were taken at diagnosis, so no one had been treated at all. They had a biopsy taken, they were given doxycycline for 14 days, then the tumors were removed via surgery and they were treated with normal standard of care. In this study, they weren't really looking for survival benefit. These patients were not followed beyond their curative surgery and regular standard of care. What was looked for was their difference between the initial biopsy and the tumor that was removed in cancer stem cells. These are cells that are partially differentiated, they're very resistant to chemotherapy, they're often harder to kill, and they're often the cells that reseed cancer and cause recurrence. So any reduction in these would be a really good thing. Now this did actually pan out. There was a very significant reduction in cancer stem cells in eight out of nine of the patients in this very tiny trial. So we have a clinical retrospective set of studies that show benefit with not very heavily pretreated patients, a bone metastases study where no benefit was shown, but the patients were very heavily pretreated, and then the breast cancer study where there was no evaluation of overall survival benefit, but cancer stem cells were reduced. It seems like there is clinical benefit here for doxycycline. And again, as a cheap drug and relatively safe drug, it's something that makes a lot of sense to try. Again, if you're looking for any benefit, there's a decent chance of benefit here and very little downside. But there is a downside. So again, because doxycycline works on your mitochondria, it does that throughout your entire body. This is not just specific for cancer cells. You are going to be hurting your mitochondria in all of your cells throughout your body slightly. The doses are high, the doses are 200 milligrams. So normal dose is 100 milligrams once per day. The doses for all of these cancer trials are double that. 100 milligrams in the morning, 100 milligrams in the evening. For a relatively short window, like the cancer stem cell trial, a 14-day window, two weeks of taking doxycycline, that makes a lot of sense. To take it for a longer period of time, like in the bone metastases study, where it was 12 weeks, that's a bit more dangerous because you run a risk of doing long-term damage to the mitochondria throughout your body. For something like this, even though it's considered to be fairly safe, again, people don't tend to take high dose doxycycline for a long period of time. I would encourage you, if you were going to adopt something like this to try and get rid of cancer stem cells or again get an edge on your chemo, to do 200 milligrams a day for a period of time, let's say two weeks, to mimic that one clinical trial, and then take a two-week break and alternate back and forth. That way you minimize the damage to the rest of your body, to your healthy cells, you give them a chance for their mitochondria to recover, and you fairly continuously stress mitochondria and cancer cells. So, last thing, I mentioned at the very beginning how doxycycline seems to synergize with many chemotherapy drugs. The animal models were particularly good for synergy between doxycycline and doxorubicin or adriamycin. Now, adriamycin causes heart damage. It's known for that. It's a very harsh chemotherapy drug. And while you might get excess benefit from using doxycycline, I would be very cautious about combining these. Because those lab mice did not get followed for the rest of their life. They did not get followed for heart damage. They did not get followed for long-term issues from that combination therapy. It was short-term with a cancer because they were implanted with large numbers of cancer cells, and if they died, they died very quickly from those tumors. That is not hopefully your case. You want to live a long, healthy life. Taking doxycycline in combination with doxorubicin could potentially increase heart damage and cause a shortening of life rather than the lengthening that you're looking for. If you want to combine doxycycline with doxorubicin, I would find a way to separate them in time so that you're not using them at the exact same time. If you've got a cycle, try and take doxycycline in a window in between the doxorubicin infusions, not at the same time, because you really don't want to double up on that damage. You don't want to have doxorubicin harming the heart muscle and doxycycline weakening the mitochondria, the powerhouse of the cell, in the heart muscle at the same time. That's not to your benefit. So again, in general, clinical data is weak, not so much because it doesn't make sense or there isn't data there, but the studies are very small and they're very early. But there are signals of efficacy for doxycycline in treating cancer. I would just urge you to use it in a way that minimizes damage to your body as a whole. Thank you. Beyond these videos, if you need more personalized guidance or a deeper dive into specific treatments to have your treatment be as effective as possible, I offer one on one sessions and medical advocacy. You can find information on our website, which is linked down below. Again, if you found this video informative, please give it a thumbs up, click the notification bell, and subscribe to our channel for more science based cancer insights.