Lung Cancer - Recur

Hi Everyone.  I have a friend who had lung cancer 5 years ago and gone with the help of a chemotherapy.  After he found out that his cancer was gone, he resumed his weight bearing workouts.  He does a lot of weight lifting.  Sometimes due to the heaviness of the barbel, it tends to fall on his chest (while he's doing chest press).  Few days ago, i got a call from him and said that his doctor found something between his chest and lung.  That the doctor advised him to do a biopsy.  My question is:  Does the weight lifting (especially putting strain on the chest) could be the reason that his lung cancer will recur?  Please advise.  Thank you in advance.