89Zr-bevacizumab PET Imaging as Predictive Biomarker for Everolimus Efficacy in Patients With Neuroendocrine Tumors
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 14
- 试验地点
- 1
- 主要终点
- change in 89Zr-bevacizumab uptake
研究概览
简要总结
This is a pilot study for evaluation of 89Zr-bevacizumab PET imaging as predictive biomarker during treatment with everolimus in patients with neuroendocrine tumors.
Patients with progressive disease during the last year will receive treatment with everolimus 10 mg/day orally and 89Zr-bevacizumab PET imaging will be performed before start of treatment and after 2 and 12 weeks of treatment in the first three patients. If the scan after 2 weeks of treatment is already informative further patients will not undergo a scan at 12 weeks. A scan is considered already informative if both scans show at least 30% decrease in uptake in case of response, or at least 30% increase in uptake in case of disease progression.
Four days before the scan patients will be injected intravenously 37 MBq, protein dose 5 mg 89Zr-bevacizumab. At day 1, day 15 and day 99, PET images will be made for visualization and quantification of VEGF in the tumor lesions and blood will be drawn for determination of angiogenesis and mTOR pathway related biomarkers.
详细描述
- Rationale:
Profound angiogenesis is an important characteristic of neuroendocrine tumors. Antiangiogenic drugs including sunitinib, bevacizumab and everolimus have shown antitumor activity in neuroendocrine tumors. The investigators participated in the RAD001 studies for neuroendocrine tumors. From preclinical studies including studies performed in our own lab the investigators know that everolimus downregulates VEGF.
Currently it is not possible to predict which individual patient will benefit from treatment with an mTOR inhibitor. A predictive biomarker for efficacy of mTOR inhibitors is urgently needed and would be helpful, as a predictive biomarker may facilitate the development of combination therapies, of individual titration of the dose, and it may facilitate early clinical studies. Furthermore, it may spare the patients unnecessary side effects. mTOR inhibitors may fail in individual patients because angiogenesis is not sufficiently inhibited. Non-invasive imaging of VEGF before and early after start of treatment may have predictive value for treatment efficacy.
Within the UMCG the investigators have an active ongoing research line on molecular imaging. The investigators have developed as part of this the 89Zr-bevacizumab PET label for non-invasive measurement of VEGF levels in the tumor and its surrounding microenvironment. This tracer can give insight in the tumors' dependency on angiogenesis as the investigators have already proven for a VEGF-receptor tyrosine kinase inhibitor. Currently this tracer is used in clinical trials. The investigators would like to examine whether all neuroendocrine tumors produce VEGF and whether they differ in their response to inhibition of VEGF by mTOR. 2. Objectives:
The primary objective is to evaluate the feasibility of 89Zr-bevacizumab-PET imaging as predictive biomarker before and during treatment with everolimus in patients with neuroendocrine tumors.
研究设计
- 研究类型
- Observational
- 观察模型
- Cohort
- 时间视角
- Prospective
入排标准
- 年龄范围
- 18 Years 至 80 Years（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •adult patients with metastatic neuroendocrine tumors
- •radiological documentation of progressive disease over the past year
- •measurable disease according to RECIST criteria
- •Adequate bone marrow function as shown by: ANC ≥ 1.5 x 109/L, Platelets ≥ 100 x 109/L, Hb > 9 g/dL.
- •Adequate liver function: serum bilirubin: ≤ 1.5 x ULN, ALT and AST ≤ 2.5x ULN. Patients with known liver metastases: AST and ALT ≤ 5x ULN.
- •Adequate renal function: serum creatinine ≤ 1.5 x ULN.
- •Fasting serum cholesterol ≤300 mg/dL OR 7.75 mmol/L AND fasting triglycerides ≤ 2.5 x ULN. NOTE: In cases where one or both of these thresholds are exceeded, the patient can only be included after initiation of appropriate lipid lowering medication
排除标准
- •uncontrolled medical conditions (eg, unstable angina, symptomatic heart failure, serious intercurrent infections)
- •any psychological, familial, sociological or geographical condition potentially hampering compliance with the study protocol and follow-up schedule of the study
- •Patients with uncontrolled diabetes mellitus as defined by fast blood sugar > 1.5 x ULN.
- •Prior therapy with RAD001 (everolimus) or other rapamycins (sirolimus, temsirolimus).
- •Concomitant medications known to inhibit, induce or be a substrate to isoenzyme CYP3A are excluded unless the drugs are medically necessary and no substitutes are available. If there are no acceptable substitutes, special precautions should be taken in these patients
研究组 & 干预措施
89Zr-bevacizumab
干预措施: 89Zr-bevacizumab (Drug)
89Zr-bevacizumab
干预措施: Everolimus (Drug)
结局指标
主要结局
change in 89Zr-bevacizumab uptake
时间窗: 12 weeks
The change in 89Zr-bevacizumab uptake in tumor lesions between the baseline PET scan and the scans performed after 2 and 12 weeks of everolimus treatment in patients with neuroendocrine tumors. In addition, effect sizes and confidence intervals will be determined.
次要结局
- Progressive disease(12 weeks)