As of February 2015, no.
The show is alive and well. in fact the Doctor has only just restarted his regeneration cycles after being granted a "regeneration extension". usually Time Lords are only allowed to regenerate a certain number of times, but Doctor Who is currently an exception to that rule.
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As of July 2017 there are no plans to cancel the show, despite the fact that it's popularity is not as great as it was about three or four years ago.
Yes. It was cancelled.
Unfortunately, iCarly will eventually get cancelled. But in a recent press conference, Miranda cosgrove stated that she is excited to begin filming a 5th season of iCarly soon. So it most likely wont be cancelled for a while. Hope this helps :)
yes. Hung got cancelled.
It was cancelled because Manny and his dad died on a bull fighting.
Sagwa most likely got cancelled for the same reason other PBS Kids got cancelled.