Studies in mice can be helpful and important. They can point scientists toward new ideas. But they do not guarantee that the same thing will work in humans. That’s why scientists are careful about big health claims based only on Petri dish or mouse data. And it’s why I want to share a story from my PhD research.
[NOTE: This is another in our series Nerdy Notes: Science in Story & Verse. In these posts, our Nerdy Girl scientists and clinicians share personal stories, insights, poetry, and more. While these posts may be lighter in terms of numbers and figures, they are still rooted in our tradition and commitment to providing accessible and trustworthy information.]
When I started my PhD in Molecular and Cellular Oncology at George Washington University, I inherited a research question that had already been studied in mouse models. The question was: how do cancer cells, living in an area of the tumor with less oxygen, become less sensitive to chemotherapy? We know that cells in solid cancers do not get the same amount of food and oxygen because blood supply is uneven. So certain chemical pathways take over in these low oxygen regions that can make chemotherapy less effective. The plan was to understand this process in human cells and to eventually make chemotherapy work better. I found these questions exciting and jumped in with a lot of confidence and passion.
On paper, it sounded pretty simple. In real life, it was anything but.
I started working with human breast cancer cells (and later other types of cancer cells). I expected the move from mouse cells (where this process had previously been studied in our lab) to human cells to be hard but still doable. What I didn’t realize was just how different those cells could be, even in a tightly controlled lab. I just couldn’t figure out the right conditions to get the human cells to do what had been seen in the mouse model. It took me about a year and a half just to figure out the basics: the right drug doses, timing, and conditions that would give meaningful results and point to a specific mechanism for making chemotherapy less effective in human cells. And those conditions were very different from what worked in mouse models. That year and a half included failed experiments, constant troubleshooting, repeating the same work, frustration…and yes, a lot of crying. And this wasn’t even in humans. This was work in a Petri dish, in very controlled conditions, without many of the complicated factors you find in a real human body.
I remember going into my proposal defense (half way through my research project) with very few positive results to show, meaning we mostly saw no effect. I couldn’t get the human cells to show they had become less sensitive to chemotherapy (under the same conditions we had used in the mouse model) and I couldn’t figure out the pathway that was involved so I could begin to reverse it to make the chemotherapy work. In other words, I was stuck! It felt like the finish line for my PhD was getting further away. (And yes, negative results still matter. Learning that something doesn’t work is important science. But that’s a topic for another day.)
Even though it was really hard at the time, that experience taught me something very important.. It’s one reason I wanted to share this. When scientists share what research actually looks like, it can help all of us think more clearly about the science we hear about. Moving from cell or animal research to human research is not easy. And if it’s this hard just to go from mouse cells to human cells in a Petri dish, imagine how much harder it is to turn that into a safe and effective treatment in people. That’s why scientists are cautious about bold claims based only on (sometimes even weak) mouse data. And it’s why we want to talk about these experiences.
We are constantly seeing claims online about nutrition, supplements, cancer treatments, and “easy fixes.” There is so much information that it can feel overwhelming, and we sometimes stop asking questions.
Basic lab research is where many discoveries begin. It helps scientists understand how things work, test ideas, and build new questions. It is the foundation of medical progress, but it is only one step of many. To turn a lab finding into a real treatment, much more work is needed. Studies have to be repeated. Conditions have to be refined. Human trials must be done. And there is a lot of uncertainty along the way.
I love basic research and the questions it raises. That’s why it’s upsetting to see funding for it being cut. This work is slow and detailed. It can look invisible from the outside, but it is essential. Just as important, the public deserves a clear understanding of what early research can and cannot tell us. A mouse study is not meaningless, but it is also not proof for humans.
So, the next time you see a big claim on social media about a supplement or treatment based only on limited animal studies, take a moment. Ask questions. Be curious. And remember how much work it takes to turn early research into something that can truly help people.
