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How do the tumors get enough oxygen and nutrients but not drugs?

drugs nutrients oxygen Tumors
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How do the tumors get enough oxygen and nutrients but not drugs?

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Because basically most of the targeted drugs are bigger molecules compared to very basic nutrients and oxygen. And also, the tumor really doesn’t need too much because it is mutating all the time and is able to survive in severe conditions. Q: What led you to work with selenium to increase drug A: Scientists were looking at stopping tumor blood vessels from growing completely, and we were looking at this one drug to see if it can enhance chemotherapeutic efficacy. But what we found is that you can’t stop blood vessels from growing completely. There is not one factor, there are hundreds of different factors, and a tumor is smart; if you block one it will use something else to grow. Then our goal was to increase the drug getting into the tumor by 70 to 80 percent. We had started working with selenium. And we found that when the drug is used in combination therapy with selenium, it works very well. Q: Why selenium? A: With selenium there are several advantages. There’s a lot of research i

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