KRAS mutation found what does that mean ?

Hi 

I could really do with some clarity please.

a new test result has appeared from one of the many ! However I had a right lower lobectomy on the 27th of August and some lymph nodes removed.

i am concerned that this now may mean I might need further treatment?  

this test has come from a lung biopsy which was done back in July - I am still waiting for lymph nodes removed results . 

could someone please explain it for me ?