Does Motion Management Technique for Lung SBRT Influence Local Control? A Single Institutional Experience Comparing Abdominal Compression to Breath-Hold Technique.

ABSTRACT

PURPOSE: Abdominal compression (COMP) and breath-hold with an active breathing coordinator (ABC) device are 2 different respiratory motion management techniques used in lung stereotactic body radiation therapy (SBRT) practice. We compared local failure (LF) results for COMP versus ABC. METHODS AND MATERIALS We surveyed our institutional review board-approved prospective registry for patients who were treated with SBRT for either a primary lung cancer (PRIME) or an oligometastatic (OLIGO) diagnosis with a minimum of 6 months' follow-up to determine their rates of local failure by motion management modality. RESULTS: From October 2003 to July 2014, 873 patients with 931 lesions were treated. Patient characteristics included 455 (52.1%) female; median age of 73 years (range, 37-97); median Karnofsky performance status (KPS) of 80 (range, 40-100); and median BMI of 26.2 (range, 12.1-56.3). Tumor characteristics included median tumor size of 2.2 cm (range, 0.7-10.0); median maximum standardized uptake value from positron emission tomography PET SUVmax of 7.5 (range, 0.8-59); 234 (25.4%) were central lesions; 830 (89.2%) lesions were PRIME; and 101 (10.8%) were OLIGO. Median follow-up and SBRT dose were 16.4 months and 50 G in 5 fractions, respectively. Overall crude rate of LF was 9.9%. Use of ABC was not associated with increased LF compared with COMP hazard ratio (HR) = 1.043 (95% CI 0.48-2.29; P = .92). Three-year actuarial rates of LF for ABC versus COMP were 13.8% and 16.5%, respectively. After stratifying by OLIGO/PRIME, neither ABC nor COMP was significantly associated with LF. Central location may be associated with LF with ABC (HR = 2.087, P = .066). On univariate analysis, BMI, tumor size, PET SUV max and central location were associated with failure, with size the most significant. CONCLUSIONS: LF rates after lung SBRT were not influenced by form of motion control overall or when stratified by tumor type. Further study on LF rates for central tumors where ABC is used is warranted.