Impact of Timing of Lobectomy on Survival for Clinical Stage IA Lung Squamous Cell Carcinoma  Chi-Fu Jeffrey Yang, MD, Hanghang Wang, MD, PhD, Arvind.

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Impact of Timing of Lobectomy on Survival for Clinical Stage IA Lung Squamous Cell Carcinoma  Chi-Fu Jeffrey Yang, MD, Hanghang Wang, MD, PhD, Arvind Kumar, BS, Xiaofei Wang, PhD, Matthew G. Hartwig, MD, MHS, Thomas A. D'Amico, MD, Mark F. Berry, MD, MHS  CHEST  DOI: 10.1016/j.chest.2017.07.032 Copyright © 2017 American College of Chest Physicians Terms and Conditions

Figure 1 Diagram showing schema of study subject selection. NSCLC = non-small cell lung cancer. CHEST DOI: (10.1016/j.chest.2017.07.032) Copyright © 2017 American College of Chest Physicians Terms and Conditions

Figure 2 A, Overall survival of clinical stage IA NSCLC patients with squamous cell carcinoma undergoing lobectomy. Represents overall survival of all patients, regardless of the number of days between diagnosis and surgery. B, Overall survival of clinical stage IA NSCLC patients with squamous cell carcinoma stratified by early vs late timing to lobectomy. Survival is calculated from date of diagnosis. Patients who received lobectomy within 37 days after diagnosis were classified as having “early” lobectomy, whereas those who received surgery starting on day 38 were classified as receiving “late” lobectomy. C, Overall survival of clinical stage IA NSCLC patients with squamous cell carcinoma stratified by early vs late timing to lobectomy. Overall survival is calculated from date of definitive surgery. Patients who received lobectomy within 37 days after diagnosis were classified as having “early” lobectomy, whereas those who received surgery starting on day 38 were classified as receiving “late” lobectomy. D, Overall survival of clinical stage IA NSCLC patients with squamous cell carcinoma stratified by early vs late timing to lobectomy. Overall survival is calculated from four months after date of diagnosis. Patients who received lobectomy within 37 days after diagnosis were classified as having “early” lobectomy while those who received surgery starting on day 38 were classified as receiving “late” lobectomy. See Figure 1 legend for expansion of abbreviation. CHEST DOI: (10.1016/j.chest.2017.07.032) Copyright © 2017 American College of Chest Physicians Terms and Conditions

Figure 3 Relationship between timing to lobectomy and overall survival for patients with clinical stage IA NSCLC diagnosed with squamous cell carcinoma. Spline plots for adjusted Cox models excluding patients who underwent surgery on the day of diagnosis for A, men, B, women, C, the entire cohort, and D, the entire cohort including patients who underwent surgery on the day of diagnosis. Median values for all covariates are used as reference standard. Model was adjusted for age, race, Charlson/Deyo comorbidity score, insurance type, tumor size, facility type, distance from patient’s residence to hospital, median household income, and hospital volume. Red area indicates 95% CI. See Figure 1 legend for expansion of abbreviation. CHEST DOI: (10.1016/j.chest.2017.07.032) Copyright © 2017 American College of Chest Physicians Terms and Conditions