coming up. an excruciating, few hours. >> i couldn't sleep that night. marcia couldn't sleep. >> reporter: in the morning, one, final search and at long last, a sign. >> all of a sudden, he starts whimpering. and he stops. >> after two, long years, are all questions about to be answered? when "dateline" continues. answered when "dateline" continues. hing. but your first treatment could be a chemo-free combination of two immunotherapies that works differently. it could mean a chance to live longer. opdivo plus yervoy is for adults newly diagnosed with non-small cell lung cancer that has spread, tests positive for pd-l1, and does not have an abnormal egfr or alk gene. it's the only fda-approved combination of two immunotherapies. opdivo plus yervoy equals... a chance for more time together. more family time. more quiet time. opdivo and yervoy can cause your immune system to harm healthy parts of your body during and after treatment. these problems can be severe and lead to death.