Blood sample, bronchoalveolar lavage fluid, and tumor tissue are collected after each treatment (group 1) or at time of each bronchoscopy (group 2) and assayed for the presence of lymphocyte phenotypes Th1, Th2, Treg, and Th17. After completion of study therapy, patients are followed at 1 month after PDT and then every 3 months for 3 years.