What are the chances of survival from Lung Cancer?

My mother in law has just found out she has lung cancer and a tumor in her lung. She will be getting surgery to remove the tumor tomorrow. What are the chances of everything being okay? Will she have to take radiation or chemotherapy afterwards? I would like to get input from anyone that has gone thru this experience. She is very scared and was a smoker for 22 years. Any information is more than welcome.