Five Nurses. One Unit. All Diagnosed with Brain Tumors

Not enough facts to think any particular thing about this other than that looking into it is a good idea.

Although Infound several articles discussing this, your link returns to this page.

It's nightmare fuel... it's obviously some sort of workplace related environmental exposure because that many nurses with the same type of cancer surely breaks statistical possibility of it being random. My first guess would be there is some imaging equipment on a floor above or below that is emitting radiation through the floor or ceiling. Or they're being exposed to some routine medication that requires use of additional PPE, and they are not being informed/educated about the additional precautions. It was an L&D floor, right? I don't think those units typically have imaging or dangerous drugs?

AllNursesAcct said:

because that many nurses with the same type of cancer

But they don't all have the same type of cancer, in fact they don't have cancer at all according to the news reports currently available. The reports are of benign brain tumors of different types. At this point with the information available there is nothing refuting whether these could even be "incidentalomas" (findings noted on testing but not thought to explain symptoms) for example—just one of many possibilities. 
 

Again, obviously investigation warranted but beyond that there is nothing else that can really be said about this. 
 

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I don't think those units typically have imaging or dangerous drugs?

They do perform imaging, news reports note the number of X-rays performed there in a given time period. Remains to be seen if there is any connection.