Development of Circulating Tumour Cell Molecular Diagnostics Using a Novel Microfluidic Device
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|ClinicalTrials.gov Identifier: NCT01193829|
Recruitment Status : Unknown
Verified April 2014 by National University Hospital, Singapore.
Recruitment status was: Recruiting
First Posted : September 2, 2010
Last Update Posted : April 28, 2014
- To compare EGFR mutations between primary non-small cell lung cancer (NSCLC) tumours and corresponding CTCs isolated by a label-free microfluidic device-based system
- To characterize the association between clinical response in NSCLC patients treated with gefitinib and serial changes in CTC EGFR mutations detected by a label-free microfluidic device-based system
The investigators recently developed a label-free, microfluidic device for capturing circulating tumour cells (CTCs) and acquired a Fluidigm Biomark digital PCR instrument for reliable low-level DNA quantification. The overall aim of this study is to test the feasibility of using these state-of-the-art devices to reliably detect clinically relevant EGFR mutations in CTCs.
|Condition or disease|
|Patients With Non-small Cell Lung Cancer|
For Aim 1, two 5ml pre-treatment blood and corresponding tumor samples will be obtained from NSCLC patients at the National University Health System. Sampling will be organized to avoid the blood samples being the first sample taken after skin puncture to minimize contamination with skin epithelial cells. For the first blood sample, CTCs will be isolated and retrieved using the NUS developed CTC bio-chip according to methods described previously.21 From second blood sample, CTCs will be isolated, fixed on the chip and stained for EpCAM, CD45 and DAPI to assess for cell purity and quantity. DNA will be extracted from the retrieved CTCs and tumour samples, and analyzed exon 19 deletion, L858R and T790M mutations by digital PCR on the Fluidigm Biomark according to methods described previously.23 EGFR mutation status in blood and tumour samples will then be compared for their concordance.
For Aim 2, patients with NSCLC being treated with gefitnib will be approached. Two 5ml blood samples will be obtained pre-treatment (baseline) and then every 4 weeks of treatment (one cycle of gefitinib) from NSCLC patients at the National University Health System.
CTCs will also be obtained and analysed from patients on another protocol receiving gefitinib/ hydroxychloroquine. (B/08/196. A phase II with a lead in phase I study to examine the tolerability, safety profile and efficacy of Hydroxychloroquine and Gefitinib in advanced Non-Small Cell Lung Cancer.) In this study, CTCs are already being collected. Hence the investigators intend to use samples from B/08/196 for CTC analysis using the CTC biochip platform.
For each timepoint, CTCs will be isolated, retrieved and analyzed for EGFR mutation status as described above. Clinical response will be determined using the RECIST criteria.34 Associations between pre-treatment EGFR mutation type quantities and best clinical response will be assessed by Fisher's exact test. Association between trends in EGFR mutation type quantities and tumour size over all treatment cycles will be assessed by observation as performed in the study by Maheswaran et al.9
The investigators plan to analyze 30 patients over one year for both aims of this study. Some cases will have relevant samples (serial blood samples and corresponding tumour) for both aims. The sample size is based on that of the study by Maheshwaran et al.9 and also the likely volume of suitable subjects during 1 year at NUHS. Relevant data for sample size estimation is otherwise lacking. In particular, the frequency of T790M mutations in a relevant patient population is lacking, highlighting the lack of adequate analytical systems for its assessment such as the one proposed in this study.
|Study Type :||Observational|
|Estimated Enrollment :||30 participants|
|Study Start Date :||September 2010|
|Estimated Primary Completion Date :||December 2014|
|Estimated Study Completion Date :||December 2014|
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01193829
|Contact: Ross Andrew Soo, MBBS||65-6772-4624||Ross_Soo@nuh.com.sg|
|National University Hospital||Recruiting|
|Contact: Ross Andrew Soo, MBBS 65-6772-4624 Ross_Soo@nuh.com.sg|
|Principal Investigator: Ross Andrew Soo, MBBS|