An interventional study of Lutathera in Neuroendocrine Tumors, sponsored by Erasmus Medical Center. Status unknown at 1 site in Netherlands. Open to participants aged 18 Years to 100 Years. Per ClinicalTrials.gov, last updated 2023-04-07.
Sponsored by Erasmus Medical Center · Not applicable, Interventional, and Basic science
Peptide receptor radionuclide therapy (PRRT) with [177Lu]Lu-DOTA-[Tyr3]octreotate (177Lu-DOTATATE) is a form of internal radiation treatment for patients with neuroendocrine tumors (NET) to reduce tumor growth and stabilize disease. Due to limited response rates, there is a need to improve this therapy. A better understanding of therapeutic radiobiological responses, such as transcriptional and DNA damage responses, could contribute to identification of biomarkers for toxicity and/or efficacy prediction. Easy access to biological samples for biomarker discovery would be via a so-called liquid biopsy (drawing blood) to collect healthy peripheral blood mononuclear cells (PBMCs) or circulating tumor DNA (ctDNA) for further investigation.
Exposure to ionizing radiation (IR) such as by PRRT leads to complex cellular responses including activation of the DNA damage response and changes in gene expression which can differ between individuals. This was previously shown for ex vivo external beam radiation of blood cells in which radiation responsive genes were identified. These genes were also similarly up- or downregulated following in vivo exposure to total-body irradiation of patients. In addition, different studies have shown a good correlation between radiation dose to the blood and DNA double strand break induction in PBMCs for various PRRT-like treatments. These results show that such events can be measured in PBMCs and indicate that ex vivo irradiation can mimic the in vivo transcriptional regulation and DNA damage induction. Therefore, to identify PRRT-induced cellular responses, the investigators will analyze the effects of 177Lu-DOTATATE IR on the transcriptional regulation in PBMCs and compare this regulation to radiation dose and DNA damage induction.
In addition, it was shown that levels of ctDNA can be associated with treatment response and anticancer treatment is also shown to influence ctDNA methylation patterns. The investigators will therefore explore dynamics of ctDNA levels and methylation patterns before and after PRRT to provide more knowledge of the effect of radiation response on ctDNA.
This is a pilot study to validate the possibility of determining the radiation response of PRRT with 177Lu-DOTATATE in PBMCs and ctDNA.
Altogether, the PBMC and ctDNA analyses will provide essential information on the PRRT radiation response using blood as easily accessible material. Future research can focus on development of radiation response biomarkers based on the outcomes of this study.
Objective: This is a pilot study to validate the possibility of determining the radiation response of PRRT with 177Lu-DOTATATE in PBMCs and ctDNA.
Study design: Prospective translational study with additional blood collections at 4 timepoints during regular patient care for ex vivo characterisation.
Study population: Twenty patients with locally advanced or metastatic NET receiving the first PRRT cycle of 7.4 GBq 177Lu-DOTATATE.
Nature and extent of the burden and risks associated with participation, benefit and group relatedness:
Participants who receive standard PRRT will undergo 4 additional venipunctures during their scheduled stay in the hospital for PRRT administration. The burden of the venipunctures is minimal. There is no benefit for particitants.
676 studies on the registry are indexed under Neuroendocrine Tumors; 169 are open to participants now.
This study's planned enrollment of 20 is below the median of 42 across 464 interventional studies indexed under Neuroendocrine Tumors.
Browse Neuroendocrine Tumors studies →Erasmus Medical Center is the lead sponsor of 466 studies on the registry; 179 are open to participants now.
Counted across the registry records on this site, refreshed daily.
Exclusion Criteria:
PRRT 4x7.4GBq
Drug: Lutathera
regulair PRRT of 4 cycles with 7.4GBq
Also known as: 177lu-dotatate
Transcriptional regulation and DNA damage induction in PBMCs after PRRT.
DNA damage will be assessed by immunofluorescent stainings and microscopic detection of γ-H2AX and 53BP1 RIF. RIF numbers of at least 50 cells from at least 4 fields of view per blood sample will be quantified using an automated quantification macro in ImageJ. RNA isolation, sequencing, analysis and qPCR validation will be done. Validation of the identified differentially expressed genes will be performed in triplicate by qPCR. For sequencing, we will use an unique in-house analysis method using a Snakemake pipeline. RIF and sequencing analysis will be performed on blinded samples to perform unbiased analysis.
Time frame: 2 years
mimic transcriptional regulation and DNA damage induction in PRRT ex vivo.
Untreated blood from the patient will be treated with 177Lu-DOTATATE ex vivo. Analysis of transcriptional regulation and DNA damage induction will be done as mentioned in the description of outcome 1.
Time frame: 2 years
detection of ctDNA in NET patients
For the assessment of circulating biomarkers of the tumor cells we will measure ctDNA levels in the blood.
Time frame: 2 years
Evaluate the effect of PRRT on ctDNA levels.
ctDNA levels will be measured in the blood before PRRT and 8 weeks after the first cycle.
Time frame: 2 years
methylation sequencing ctDNA
DNA methylation sequencing method will be used to analyze the ctDNA. The MeD-seq assay will be used for genome-wide DNA methylation profiling on cell-free DNA (cfDNA)
Time frame: 2 years
Plan to share: No
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