RESULTS: Of the NSCLC cohort of 359,608, 136 patients received PDT with other treatments, and 1405 received non-PDT ablation with other treatments. In PDT group, 66% of the PDT treatment was within one year of NSCLC diagnosis. Forty-one percent of patients had surgery prior to PDT and 32% had radiation prior to PDT. In non-PDT ablation group, 75% of the treatment was within one-year of NSCLC diagnosis. Thirty-two% of patients had surgery prior to non-PDT ablation and 44% had radiation prior to non-PDT ablation. Unadjusted mean time to follow-up treatment was 235 days (SD 566) for PDT group and 147 days (SD 382) for non-PDT ablation group. In a GLM model, after adjusting for demographic and clinical characteristics, PDT group was associated with an average increase of 80 days in time to follow-up treatment (p=0.0253) compared to non-PDT ablation group. Also, PDT was associated with 38% increase in cost, compared to non-PDT ablation group (p=0.0014).