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M. Nelson

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    MINI 25 - Trials, Radiation and Other (ID 142)

    • Event: WCLC 2015
    • Type: Mini Oral
    • Track: Thymoma, Mesothelioma and Other Thoracic Malignancies
    • Presentations: 1
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      MINI25.14 - Diffuse Idiopathic Pulmonary Neuroendocrine Cell Hyperplasia (DIPNECH): Descriptive Analysis and Overall Survival (ID 3153)

      16:45 - 18:15  |  Author(s): M. Nelson

      • Abstract
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      Diffuse idiopathic pulmonary neuroendocrine cell hyperplasia (DIPNECH) is a rare disorder characterized by proliferation of neuroendocrine cells in the bronchial wall and considered to be pre-invasive lesion for lung carcinoid tumors [1]. There is increasing rate of diagnosis of this condition due to widespread availability and use of cross sectional imaging. DIPNECH is reported as an incidental finding in approximately 5.4% of patients undergoing resection for lung neoplasms [2]. The optimal management of this condition is currently not well-established. The limited data regarding the clinicopathologic characteristics and long term outcome for patients with DIPNECH provided a strong rationale for this study.

      We employed medical records to obtain demographic, clinical characteristics and survival for patients diagnosed with DIPNECH at our institution between January 1990 to December 2014. A review of archival diagnostic material was conducted by expert pulmonary pathologists to confirm the original diagnosis. Differences in clinical characteristics and survival was assessed between patient groups defined by race, gender, age, smoking status, body habitus and treatment received. Survival was computed using the Kaplan–Meier method while univariate and multivariate models were employed to assess for significant association between patient survival and variables of interest.

      A total of 27 patients were included in this analysis. The majority of patients were females (89%) and predominantly of Caucasian (66.7%) or Black (14.8%) race. The median age at diagnoses was 63 years (range: 20-77) and 61.5% of patients were non-smoker. Approximately 52% underwent surgical resection. The median overall survival (OS) was 151 months (95%CI: 39-165) while 1-year and 5-year survival rates were 95.2% and 73.2% respectively. Nineteen patients (71%) remain alive at the time of this analysis. Male patients (HR: 4.58, 95%CI: 0.76-27.67, p=0.098) and smokers (HR: 23.79; 95%CI: 0.98-579.54; p<0.052) appeared to have an inferior survival. No statistically significant difference in survival was recorded in patient subgroups defined by age, race, surgical intervention or body weight.

      DIPNECH is a rare condition with increasing rate of diagnosis. The overall prognosis is good in comparison to other lung neoplasms but up to a quarter of the patients do not survive beyond five years post diagnosis. Male gender and associated use of tobacco products may be associated with poor outcome. References: 1. Chassagnon, G., et al., DIPNECH: when to suggest this diagnosis on CT. Clin Radiol, 2015. 70(3): p. 317-25. 2. Ruffini, E., et al., The significance of associated pre-invasive lesions in patients resected for primary lung neoplasms. Eur J Cardiothorac Surg, 2004. 26(1): p. 165-72.

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