@sanyogita15, I'm glad to hear that your NGS testing came back, and that result can now help to guide your care. I'm not an expert or a medical professional. Combining targeted therapies with chemo and/or radiation seems to be more common now, especially for early stage cancers. There is a risk that the targeted therapy won't be a good match for your specific EGFR mutation, in that case you would likely be having chemo. Be sure to get all of your questions answered from the doctors. It's a difficult decision when they are suggesting such different treatment plans.
Also, remember that the prognosis statistics are not your specific story. Many of us are outliving our initial prognosis. I have the ALK mutation (stage 4), and I just celebrated 4 years.