A redesigned version of the CTC-Chip – a microchip-based device for capturing rare circulating tumor cells (CTCs) – appears to be more effective and should be easier to manufacture than the original. Called the HB-(herringbone) Chip, the new device also may provide more comprehensive and easily accessible data from captured tumor cells.
Massachusetts General Hospital (MGH) researchers – including members of the team that developed the CTC-Chip – report the second-generation device in a Proceedings of the National Academy of Sciences paper that has been released online.
"The originally CTC-Chip worked wonderfully in a small-scale laboratory setting, but limitations arose when we attempted to increase production for larger clinical studies. The new device performs as well or better than the previous technology with several additional benefits," says Shannon Stott, PhD, of the MGH Center for Engineering in Medicine, co-lead author of the PNAS paper. "It also was able to capture something that had never been seen using either the CTC-chip or the most prevalent previous technology – small clusters of CTCs, the significance of which we need to study."
CTCs are living solid tumor cells found at extremely low levels in the bloodstream. Until the 2007 development of the CTC-chip by researchers from the MGH Cancer Center and the Center for Engineering in Medicine, it was not possible to get information from CTCs that would be useful for clinical decision making.In the original device, patient blood samples are passed over a silicon chip covered with microscopic posts coated with an antibody that binds to most tumor cells. Not only did this design proved challenging to manufacture reliably and cost-effectively, but the smooth flow of blood around the microposts also limited the number of CTCs that came into contact with the antibody-covered surfaces. In their search to increase the capture of CTCs, the researchers found that passing samples through a chamber lined with a herringbone pattern of grooves – an approach developed elsewhere for quickly mixing independent streams of fluid – would generate a more chaotic flow that could significantly increase the number of captured cells.
The HB-Chip also captured clusters of 4 to 12 CTCs from several patient samples but not from samples to which cancer cells had been added. No previous technology for capturing CTCs has ever found such clumps of tumor cells. "These clusters may have broken off from the original tumor, or they might represent proliferation of CTCs within the circulation," says Mehmet Toner, PhD, director of the BioMicroElectroMechanical Systems Resource Center in the MGH Center for Engineering in Medicine, the paper's senior author. "Further study of these clusters could provide valuable insight in the metastatic process."
Daniel Haber MD PhD, director of the MGH Cancer Center and a co-author of the study, says, "This new technology is a powerful platform that will enable increasingly sophisticated analyses of metastasis and support clinical research in targeted cancer therapies."
While the MGH has filed a patent for the HB-Chip, the research team will continue to develop the technology before potential licensing is explored. The study was supported by grants from Stand Up to Cancer, the Prostate Cancer Foundation, the National Institute for Biomedical Imaging and Bioengineering, the National Cancer Institute and the American Cancer Society, along with several additional funders.
Toner is the Benedict Professor of Surgery and Stott is a research fellow in Surgery at Harvard Medical School. Chia-Hsien Hsu, PhD, formerly of the MGH Center for Engineering in Medicine and now with the National Health Research Institutes of Taiwan, was co-lead author of the PNAS paper. Additional co-authors are Dina Tsukrov, Ajay Shah, George Korir, Frederick Floyd Jr., Daniel Irimia and Sunitha Nagrath, MGH Center for Engineering in Medicine; and Min Yu, David Miyamoto, Belinda Waltman, Michael Rothenberg, Malgorzata Smas, Anna Gilman, Jenna Lord, Daniel Winokur, Simeon Springer, Lecia Sequist, Richard Lee, Kurt Isselbacher and Shyamala Maheswaran, MGH Cancer Center.
Massachusetts General Hospital, established in 1811, is the original and largest teaching hospital of Harvard Medical School. The MGH conducts the largest hospital-based research program in the United States, with an annual research budget of more than $600 million and major research centers in AIDS, cardiovascular research, cancer, computational and integrative biology, cutaneous biology, human genetics, medical imaging, neurodegenerative disorders, regenerative medicine, systems biology, transplantation biology and photomedicine.
Katie Marquedant | EurekAlert!
Rochester scientists discover gene controlling genetic recombination rates
23.04.2018 | University of Rochester
One step closer to reality
20.04.2018 | Max-Planck-Institut für Entwicklungsbiologie
Physicists at the Laboratory for Attosecond Physics, which is jointly run by Ludwig-Maximilians-Universität and the Max Planck Institute of Quantum Optics, have developed a high-power laser system that generates ultrashort pulses of light covering a large share of the mid-infrared spectrum. The researchers envisage a wide range of applications for the technology – in the early diagnosis of cancer, for instance.
Molecules are the building blocks of life. Like all other organisms, we are made of them. They control our biorhythm, and they can also reflect our state of...
University of Connecticut researchers have created a biodegradable composite made of silk fibers that can be used to repair broken load-bearing bones without the complications sometimes presented by other materials.
Repairing major load-bearing bones such as those in the leg can be a long and uncomfortable process.
Study published in the journal ACS Applied Materials & Interfaces is the outcome of an international effort that included teams from Dresden and Berlin in Germany, and the US.
Scientists at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) together with colleagues from the Helmholtz-Zentrum Berlin (HZB) and the University of Virginia...
Novel highly efficient and brilliant gamma-ray source: Based on model calculations, physicists of the Max PIanck Institute for Nuclear Physics in Heidelberg propose a novel method for an efficient high-brilliance gamma-ray source. A giant collimated gamma-ray pulse is generated from the interaction of a dense ultra-relativistic electron beam with a thin solid conductor. Energetic gamma-rays are copiously produced as the electron beam splits into filaments while propagating across the conductor. The resulting gamma-ray energy and flux enable novel experiments in nuclear and fundamental physics.
The typical wavelength of light interacting with an object of the microcosm scales with the size of this object. For atoms, this ranges from visible light to...
Stable joint cartilage can be produced from adult stem cells originating from bone marrow. This is made possible by inducing specific molecular processes occurring during embryonic cartilage formation, as researchers from the University and University Hospital of Basel report in the scientific journal PNAS.
Certain mesenchymal stem/stromal cells from the bone marrow of adults are considered extremely promising for skeletal tissue regeneration. These adult stem...
13.04.2018 | Event News
12.04.2018 | Event News
09.04.2018 | Event News
23.04.2018 | Physics and Astronomy
23.04.2018 | Physics and Astronomy
23.04.2018 | Trade Fair News