Leaving the US during green card application

Hi all,

I wanted to see if anyone has any experience with a pending green card application and a move outside of the US. I currently like in the US and am waiting for my application to clear (hoping for a positive result). My wife's work and family health issues with take us back to Canada though.

If I am out of the US for a certain period of time, I take it my green card application will be voided.

Any insight would be greatly appreciated.

Thank you.