8528 Background: Bronchial Neuroendocrine tumours (NETs) are rare with an incidence of between 0.2 – 2 per 100,000 population. There has been an increase in prevalence due to increased awareness, enhanced immunohistochemistry and greater use of Computed tomography (CT). Bronchial NETs are classified according to the WHO guidelines developed in 2004 where they are graded by histological classification into ‘typical’, ‘atypical’ NETs or small and large neuroendocrine carcinoma’s (NECs). Typical NETs are regarded as being low-grade malignant however metastatic disease can still develop. Aims: We sought to determine the incidence of metastatic typical bronchial NETs, their survival and investigate the imaging and treatment used in their management. Methods: We performed a retrospective analysis of all bronchial NETs managed at our centre from 2001 to 2016. From those identified as typical NETs, we analysed clinical records in those with advanced disease (Stage IV). Results: From a total of 251 bronchial NETs, there were 147 ‘Typical’ NETs, 30(20%) of whom had advanced disease compared to 82 'Atypical' bronchial NETs of whom 55 had advanced disease (67%). The median age at diagnosis was 58 (range 24-77). In the 'Typical' NETs, 24/30 had liver metastases, 19/30 skeletal metastases, and 16 had carcinoid syndrome (CS). Functional imaging with FDG PET scan was positive in 7/10 patients and somatostatin receptor scintigraphy (SRS) positive in 16/20 and in 4/11 there was avidity with both. 20 patients were treated with somatostatin analogues predominantly for CS symptoms. 11 patients treated with peptide radiolabelled receptor targeted therapy (PRRT) with a median Time-To-Progression (TTP) of 27 months. 11 patients received chemotherapy with median TTP of 16 months with 4 patients demonstrating partial response. Conclusions: Typical bronchial NETs can lead to advanced disease in up to 20% of patients. Their behavior can be aggressive and is not predictable by histology alone. Functional imaging with both FDG and SRS may help determine the most appropriate treatment. Both PRRT and chemotherapy can be considered in progressive disease.
4090 Background: The efficacy of peptide-radiolabelled receptor targeted therapy (PRRT) in patients with well differentiated neuroendocrine tumours has been demonstrated in Phase II and Phase III studies. The recently completed phase IV NETTER-01 demonstrated disease stabilisation or partial response in approximately 80% of patients. However, more studies are needed to identify predictors of PRRT response. We sought to investigate the clinic-pathological characteristics in patients that had radiological progression or death within 12 months of completion of treatment with PRRT. Methods: We performed a retrospective analysis of all patients who had PRRT from 2011-2016. Patient with at least one year of follow-up data from the last treatment dose were included. Patients with evidence of radiological progression within one year of finishing treatment (Group 1) were compared to a similar group with disease stabilisation/response (Group 2)that were matched for age, grade, primary and distribution of metastases. The indication for PRRT was defined as either small volume progression ( < 20%) or progression by RECIST. Results: 307 patients underwent PRRT with Lu-177 or Y-90 DOTATATE during this period. 66 patients in Group 1 were compared to 64 patients in Group 2. There was a significant difference in median overall survival, Group 1 = 21 months compared to Group 2 = 35 months, (p < 0.002). A significantly higher proportion of patients in group 1 had more than 50% liver volume (p < 0.0001). Mean CgA was significantly higher in Group 1, 1250 pg/ml vs 608 pg/ml in Group 2 ( p < 0.03). 18 patients in Group 2 had small volume progression prior to treatment commencement compared to 6 in Group 1 (p < 0.003). Conclusions: Radiological progression within 12 months of completion of PRRT is associated with a worse outcome in terms of OS. Patients with greater liver involvement and highest CgA levels are more likely to progress within 12 months of treatment completion. Earlier treatment with PRRT in patients with radiological progression not meeting RECIST criteria may need to be conisdered. There may be a greater survival benefit if PRRT is given prior to the development of large volume disease.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.