Treatment patterns and clinical outcomes of patients with metastatic gastroenteropancreatic neuroendocrine tumors (mGEP-NETs).

Abstract Lutetium-177 ( 177 Lu)-DOTATATE is an effective systemic therapy for metastatic somatostatin receptor positive neuroendocrine tumors (NETs). Here we report our experience with the use of pre-therapy 68 Ga-DOTATATE PET as prognostic marker for short-term clinical outcomes of 177 Lu-DOTATATE therapy in patients with advanced NETs. Materials and methods: We retrospectively reviewed patients who received at least one dose of 177 Lu-DOTATATE between Dec. 2016 and July 2019 at our institution. 50 patients (63.6 ± 10.0 years) with advanced gastroenteropancreatic neuroendocrine tumors (GEP-NETs) who had pre-therapy 68 Ga-DOTATATE PET were included in the analysis. 68 Ga-DOTATATE avid tumor volumes were determined automatically using an SUV thresholding approach. Total and extrahepatic 68 Ga-DOTATATE avid tumor volumes were measured and dichotomized into large and small tumor volume groups. Association with progression free survival (PFS) and overall survival (OS) were determined at median follow up of 32 months by Kaplan-Meier survival analysis with Log-Rank test. Results: During follow up, 38 patients (76%) had disease progression and 15 patients (30%) died. Kaplan-Meier analysis of PFS in GEP-NETs patients showed that smaller extrahepatic 68 Ga-DOTATATE avid tumor volume (<140 mL) is associated with significantly longer PFS (Median PFS 29.0 ± 6.7 months vs 9.0 ± 1.7 months, P = 0.0001). This trend in PFS is less prominent when total 68 Ga-DOTATATE avid tumor volume is analyzed. Similarly, Kaplan-Meier analysis of OS found that GEP-NETs patients with smaller extrahepatic 68 Ga-DOTATATE avid tumor volume (<150 mL) is associated with significantly longer OS (Median OS not reached vs 44.0 ± 12.3 months, P = 0.002). This association with OS is not statistically significant when total 68 Ga-DOTATATE avid tumor volume is analyzed. When 68 Ga-DOTATATE avid hepatic tumor volume is grouped into low (<500 mL), medium (500-1000mL) and large (> 1000 mL) tumor volumes, no statistically significant difference in PFS is observed, P = 0.19. The accuracy of extrahepatic 68 Ga-DOTATATE avid tumor volume as prognostic marker for PFS and OS at 32 months are moderate at 58% and 72%. Conclusions: Smaller extrahepatic 68 Ga-DOTATATE avid tumor volumes are associated with longer PFS and OS following 177 Lu-DOTATATE treatment in patients with advanced GEP-NETs. The accuracy of extrahepatic 68 Ga-DOTATATE avid tumor volume as prognostic marker for PFS and OS at 32 months are moderate, which may limit its clinical application.

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Real‐World Treatment Patterns and Clinical Outcomes in Advanced Gastrointestinal Neuroendocrine Tumors (GI NET): A Multicenter Retrospective Chart Review Study

The Oncologist ◽

10.1634/theoncologist.2018-0519 ◽

2019 ◽

Vol 24 (8) ◽

pp. 1056-1065

Author(s):

Matthew H. Kulke ◽

Al B. Benson ◽

Arvind Dasari ◽

Lynn Huynh ◽

Beilei Cai ◽

...

Keyword(s):

Clinical Outcomes ◽

Neuroendocrine Tumors ◽

Real World ◽

Chart Review ◽

Retrospective Chart Review ◽

Treatment Patterns ◽

Review Study

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Treatment patterns and clinical outcomes of patients with metastatic gastroenteropancreatic neuroendocrine tumors (mGEP-NETs).

Journal of Clinical Oncology ◽

10.1200/jco.2016.34.4_suppl.331 ◽

2016 ◽

Vol 34 (4_suppl) ◽

pp. 331-331

Author(s):

Xiaolong Jiao ◽

Sonia J. Pulgar ◽

Marley Boyd ◽

Fadi S. Braiteh ◽

Susan Pitman Lowenthal ◽

...

Keyword(s):

Targeted Therapy ◽

Small Bowel ◽

Clinical Outcomes ◽

Systemic Treatment ◽

Somatostatin Analogs ◽

Community Setting ◽

Tumor Grade ◽

Treatment Patterns ◽

Gastroenteropancreatic Neuroendocrine Tumors ◽

Primary Tumor Site

331 Background: mGEP-NETs are rare and heterogeneous tumors. Limited data has been published on real world clinical management of these tumors. This study was conducted to understand the treatment patterns and clinical outcomes of patients with mGEP-NETs treated in the community oncology setting. Methods: A retrospective study was conducted using US Oncology’s (USON) iKnowMed electronic health record (EHR) database with supplemental chart review. The first diagnostic record of mGEP-NET in the EHR system was defined as the date of diagnosis of mGEP-NET. Inclusion criteria: ≥ 18 years of age at diagnosis; diagnosis of mGEP-NET between 1/1/2008 to 12/31/2012. Patients in clinical trials or with poorly differentiated tumors were excluded. Results: 229 patients were included with a median age of 64.0 years. Primary tumor site included small bowel (47.6%), pancreas (31.4%), and other (21.0%). Tumor grade was available for 134/229 (58.5%) patients, and the majority was reported as well-differentiated (52.8%). Chromogranin A (CgA) and urinary 5-HIAA were reported for 34.9%, and 32.8% of patients respectively. 37 (16.2%) of patients were under observation only. For those receiving systemic treatment, median time to first systemic treatment after diagnosis was 2.7 weeks, with 75% of patients starting therapy by 9.4 weeks. 120 (52.4%) patients received only somatostatin analogs (SSAs) during the study period, and 72 (31.4%) patients received chemotherapy, and/or targeted therapy. In the 1st line setting (n = 192), 148 (77%) patients received SSAs, 23 (12%) chemotherapy, and 21 (10.9%) targeted therapy. The most common AEs for SSAs were diarrhea (18.2%), abdominal pain (16.9%), and fatigue (13.5%). The median OS from diagnosis was 84.2 months [95%CI 70.9, 108.0 months] for the overall cohort. OS was longer in small bowel NETs than in pancreatic or other NETs (median OS 108.0 vs 69.9 vs 84.2 months, p = 0.017). Conclusions: Most of the patients with mGEP-NETs received systemic treatment soon after diagnosis and referral to USON. The OS and AEs were consistent with other studies. Low reporting of CgA, 5-HIAA, and tumor grade reflected variability of clinical practice in the community setting.

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