- Results of the multi-center, randomized, comparator-controlled phase III NETTER-2 trial show that first-line treatment with radioligand therapy 177LU-DOTATATE in combination with long-acting octreotide significantly improves progression-free survival in patients with recently diagnosed somatostatin receptor-positive grade 2 and 3 advanced gastroenteropancreatic neuroendocrine tumors (GEP-NETs).
- Median progression-free survival was 22.8 months in patients who received first-line 177LU-DOTATATE plus long-acting octreotide versus 8.5 months in patients who were treated with high-dose long-acting octreotide alone. The overall response rate was significantly higher in the 177LU-DOTATATE arm compared with the control group (43% vs 9%).
- This study is the first clinical trial to evaluate first-line radioligand therapy in solid tumors, results of which were selected as late breaking data at the American Society of Clinical Oncology’s annual Gastrointestinal Cancers Symposium (ASCO GI24), January 18-20 in San Francisco.
Co-authored by Jaume Capdevila, Medical Oncologist at the Vall d’Hebron University Hospital (HUVH) and Senior Investigator of the Vall d’Hebron Institute of Oncology’s (VHIO) Upper Gastrointestinal and Endocrine Tumor Group, results of the phase III NETTER-2 open-label, multi-center, randomized comparator-controlled trial demonstrate that first-line treatment with 177LU-DOTATATE combined with long-acting octreotide significantly improves progression-free survival (PFS) in patients with recently diagnosed somatostatin receptor-positive grade 2 and 3 advanced gastroenteropancreatic neuroendocrine tumors (GEP-NETs).
Findings from this study, selected as late breaking data (1) at the American Society of Clinical Oncology’s annual Gastrointestinal Cancers Symposium (ASCO GI24), January 18-20 in San Francisco, were presented today by first author Simron Singh, Medical Oncologist and Affiliate Scientist at the Sunnybrook Odette Cancer Center, University of Toronto.
Neuroendocrine tumors (NETs) are a type of cancer that originate in neuroendocrine cells throughout the body and are commonly considered slow-growing malignancies. However, some NETs are associated with rapid progression and poor prognosis and in many cases, diagnosis is delayed until patients have advanced disease. Even though NETS are a rare disease, their incidence has grown by over 500% in the last three decades and there is an urgent need for additional treatment options for patients recently diagnosed with inoperable or advanced disease.
“Currently, there is no universally accepted first-line therapy for high grade, well-differentiated gastroenteropancreatic neuroendocrine tumors,” observes Jaume Capdevila. “Radioligand therapy is an innovative targeted cancer treatment that uses the specific characteristics of tumor cells as the basis for its mechanism of action so that radiation primarily affects tumor cells with minimal toxicity to healthy cells.”
Mechanism of Action 177LU-DOTATATE
177LU-DOTATATE consists of a radioactive isotope, lutetium-177, linked to dotatate—a molecule that attaches to GEP-NET cells that have a type of molecule called somatostatin receptor on the cell surface. The drug penetrates these tumor cells with somatostatin receptors and the radiation emitted by lutetium-177 helps to destroy the cancer cells.
A total of 226 patients with recently diagnosed somatostatin receptor-positive high grade 2 or grade 3 (Ki-67 ≥10% and ≤55%) advanced GEP-NETs participated in the NETTER-2 trial. The overall response rate of patients who received the radiopharmaceutical combination was 43% versus 9.3% in the control arm. Median PFS was 22.8 months and 8.5 months, respectively.
With these results, NETTER-2 is the second phase III trial to show clinically significant results for patients. The approval of 177LU-DOTATATE in 2018 was originally based on the pivotal NETTER-1 study, which demonstrated significant and clinical meaningful PFS prolongation for patients with grade 1 and 2 inoperable midgut neuroendocrine tumors who were progressing despite standard treatment.
“NETTER-2 is the first clinical trial to assess first-line targeted radioligand therapy in solid tumors. Our results point to a change in clinical practice for patients with recently diagnosed advanced gastroenteropancreatic neuroendocrine tumors which are more aggressive than low-grade classical neuroendocrine tumors and support additional studies evaluating targeted radioligand therapy as a treatment option for other settings,” concludes Capdevila.
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References:
- American Society of Clinical Oncology’s annual Gastrointestinal Cancers Symposium (ASCO GI24)
Session details:
Oral Abstract Session B: Cancers of the Pancreas, Small Bowel, and Hepatobiliary Tract
LBA588: [177Lu]Lu-DOTA-TATE in newly diagnosed patients with advanced grade 2 and grade 3, well-differentiated gastroenteropancreatic neuroendocrine tumors: Primary analysis of the phase 3 randomized NETTER-2 study.
Presenter: Simron Singh, MD, MPH | Division of Medical Oncology, Sunnybrook Odette Cancer Center, University of Toronto
Level 3, Ballroom | Live Stream
