Cancerous tumors tend to siphon more resources than healthy cells. It's not surprising that they'd have a higher concentration of microplastics

It should still be compared to differences in other resources being transported to the tissue, see my answer below. I am not a fan of microplastics, I don't try to discredit their health effects. It is just that this much information does not help much. I understand that causation would be much harder to prove, but at least one should try to prove for instance that ratio of cancerous to healthy tissue microplastics is much higher than the same ratio other for other stuff that tissues generally transport by blood vessels. This would atleast show that there is an extraordinary relation between the tissue and microplastics in the context of cancer. It could still be causation on the other direction, such as "maybe tissue structure of prostate cancer allows it to absorb microplastics more than other types of resources" but even that would be a useful piece of information.

My complaint was more about the baity title. Nevertheless cancer tissues generate more blood vessels around them to transport more resources to the tissue. A better metric would likely be something that normalizes the amount of microplastics by inflow of total particles. Even other tissue resource densities might serve the purpose. But anything else is either bad science communication or bad science.

And what are the systematic errors on that? Cancer cells are abnormal in many ways per se, specially growing stats....