• Popular
    • Medicine
    • Radiology
    • Cardiology
    • Surgery
    • Nanomedicine
    • Military Medicine
    • Rehab
  • Categories
    • Exclusive
    • A-D
      • Anesthesiology
      • Art
      • Cardiac Surgery
      • Cardiology
      • Critical Care
      • Dentistry
      • Dermatology
      • Diagnostics
    • E-I
      • Emergency Medicine
      • ENT
      • Genetics
      • Geriatrics
      • GI
      • Informatics
    • M-N
      • Medicine
      • Military Medicine
      • Nanomedicine
      • Net News
      • Neurology
      • Neurosurgery
      • Nuclear Medicine
    • O-P
      • Ob/Gyn
      • Oncology
      • Ophthalmology
      • Orthopedic Surgery
      • Pathology
      • Pediatrics
      • Plastic Surgery
      • Psychiatry
      • Public Health
    • R-V
      • Radiation Oncology
      • Radiology
      • Rehab
      • Reproductive Medicine
      • Space Medicine
      • Sports Medicine
      • Surgery
      • Thoracic Surgery
      • Urology
      • Vascular Surgery
  • SUBSCRIBE
  • Submit PR
  • About
  • Follow
    • Facebook
    • Twitter
    • Linkedin
    • Youtube
    • Instagram
    • RSS
  • Submit PR
  • Log in
Medgadget
Medgadget
  • Popular
    • Medicine
      Nanoparticles Get Lymphatic Vessels Pumping

      Nanoparticles Get Lymphatic Vessels Pumping

      Levels Is Making Metabolism and Blood Glucose Tracking Accessible To Everyone

      Levels Is Making Metabolism and Blood Glucose Tracking Accessible To Everyone

      CRISPR Combined with Glowing Proteins for Viral Detection

      CRISPR Combined with Glowing Proteins for Viral Detection

      Biomimetic Construct Models Burn Injuries

      Biomimetic Construct Models Burn Injuries

    • Radiology
      Imaging Technique Reveals Contraction Patterns During Labor

      Imaging Technique Reveals Contraction Patterns During Labor

      Moving Cells Using Ultrasound

      Moving Cells Using Ultrasound

      Ultrasound Catheter to Treat Hypertension

      Ultrasound Catheter to Treat Hypertension

      Antibacterial Smart Sutures Visible in CT Scans

      Antibacterial Smart Sutures Visible in CT Scans

    • Cardiology
      Scientists Grow Electrodes Inside The Body

      Scientists Grow Electrodes Inside The Body

      Patient-Specific Soft Robotic Heart Replicas for Treatment Planning

      Patient-Specific Soft Robotic Heart Replicas for Treatment Planning

      Tiny Patch for Cardiac Ultrasound Imaging

      Tiny Patch for Cardiac Ultrasound Imaging

      Belt Monitors Heart Failure Patients

      Belt Monitors Heart Failure Patients

    • Surgery
      Nanoparticles Get Lymphatic Vessels Pumping

      Nanoparticles Get Lymphatic Vessels Pumping

      Biomimetic Construct Models Burn Injuries

      Biomimetic Construct Models Burn Injuries

      Exclusive Look at HandX Robotic-Assisted Surgical Device from Human Xtensions

      Exclusive Look at HandX Robotic-Assisted Surgical Device from Human Xtensions

      Self-Assembling Peptides as a Bioink

      Self-Assembling Peptides as a Bioink

    • Nanomedicine
      Nanoparticles Get Lymphatic Vessels Pumping

      Nanoparticles Get Lymphatic Vessels Pumping

      Bottlebrush Particle for Synergistic Drug Combinations

      Bottlebrush Particle for Synergistic Drug Combinations

      Extra Hot Nanoparticles for Cancer Therapy

      Extra Hot Nanoparticles for Cancer Therapy

      Making Tumors Tastier for the Immune System

      Making Tumors Tastier for the Immune System

    • Military Medicine
      Device Measures Hemoglobin More Accurately in Dark Skin

      Device Measures Hemoglobin More Accurately in Dark Skin

      Fingertip Sensor Measures Lithium Levels in Sweat

      Fingertip Sensor Measures Lithium Levels in Sweat

      Fabric Makes Electricity from Movement to Power Wearables

      Fabric Makes Electricity from Movement to Power Wearables

      Wearable Uses Microneedles to Track Metabolism

      Wearable Uses Microneedles to Track Metabolism

    • Rehab
      Empowering Stroke Survivors: Interview with Kirsten Carroll, CEO at Kandu Health

      Empowering Stroke Survivors: Interview with Kirsten Carroll, CEO at Kandu Health

      Smart Walking Stick for Visually Impaired People

      Smart Walking Stick for Visually Impaired People

      Implantable Device Adheres to Muscle, Treats Atrophy

      Implantable Device Adheres to Muscle, Treats Atrophy

      Non-Invasive Spinal Modulation for Cerebral Palsy

      Non-Invasive Spinal Modulation for Cerebral Palsy

  • Categories
    • Exclusive
    • A-D
      • Anesthesiology
      • Art
      • Cardiac Surgery
      • Cardiology
      • Critical Care
      • Dentistry
      • Dermatology
      • Diagnostics
    • E-I
      • Emergency Medicine
      • ENT
      • Genetics
      • Geriatrics
      • GI
      • Informatics
    • M-N
      • Medicine
      • Military Medicine
      • Nanomedicine
      • Net News
      • Neurology
      • Neurosurgery
      • Nuclear Medicine
    • O-P
      • Ob/Gyn
      • Oncology
      • Ophthalmology
      • Orthopedic Surgery
      • Pathology
      • Pediatrics
      • Plastic Surgery
      • Psychiatry
      • Public Health
    • R-V
      • Radiation Oncology
      • Radiology
      • Rehab
      • Reproductive Medicine
      • Space Medicine
      • Sports Medicine
      • Surgery
      • Thoracic Surgery
      • Urology
      • Vascular Surgery
  • SUBSCRIBE
  • Submit PR
  • About
  • Log in
  • Submit PR
  • Follow
    • Facebook
    • Twitter
    • Linkedin
    • Youtube
    • Instagram
    • RSS

Spray Painting Cancer Cells

November 29th, 2011 Shiv Gaglani Exclusive, Genetics, Oncology


Two months ago we reported on the first ovarian cancer surgeries performed with fluorescence guidance. As described in the Nature Medicine paper, the international team of researchers from The Netherlands, Germany, and Indiana used folate coupled to fluorescein isothiocyanate (FITC) to make ovarian cancer cells glow so they could be easily identified.

Now, in this week’s issue of Science Translational Medicine, another international team from Japan and Maryland reports their development of a spray-on probe that may provide even better sensitivity and fluorescent contrast than the folate-FITC counterpart. The editors of STM summarize this work well in the following note:

Ovarian cancer is a deadly gynecological disease, considering its propensity for invading the peritoneal cavity and depositing tumors throughout. Surgeons can miss these disseminated tumors during surgical removal of cancerous lesions, owing to their small size (~1 mm) and unclear borders. To help surgeons visualize and eliminate these clandestine killers, Urano et al. have developed a small-molecule aminopeptidase probe that fluoresces upon contact with cancer cells. The probe –g-glutamyl hydroxymethyl rhodamine green (gGlu-HMRG) -is intramolecularly caged, so that it is quenched (nonfluorescent) in its ”off” state. When the probe encounters cancer cells, which overexpress the enzyme g-glutamyltranspeptidase (GGT), the gGlu is cleaved, simultaneously turning ”on” the fluorescent HMRG. Urano and colleagues first tested the probe in 11 human ovarian cancer cell lines in vitro and observed rapid fluorescence within 10 min after addition of the imaging agent to the cell cultures. They next moved into several mouse models of disseminated human peritoneal ovarian cancer, using a spray formulation of the probe that allowed the researchers to topically apply the probe during surgery or endoscopy. Within 1 min of spraying the tumors, gGlu-HMRG was enzymatically cleaved, revealing a bright fluorescent region of the peritoneal cavity in which the cancerous lesions were located. These small nodules were quickly and completely removed from living animals and depositing tumors throughout. Surgeons can miss these disseminated tumors during surgical with forceps, demonstrating the power of rapid fluorescence-guided tumor resection.

This gGlu-based fluorescent probe as well as several other aminopeptidase-based reagents identified by the authors could help surgeons to track down tiny tumors dispersed throughout body cavities, ensuring that no residual tumor is left behind. Complete obliteration of disseminated tumors should improve cancer outcomes after surgery.

In addition to increased sensitivity and contrast, the spray-on probe has the the advantage of being easily interfaced with existing intraoperative and endoscopic procedures, visible within seconds or minutes of spraying, and potentially less toxic given that topical spraying requires a lower dosage (1% in some cases) than currently used intravenous fluorophores.

This platform of course remains to be tested in humans so we look forward to hearing about upcoming clinical trials.

We followed up with senior author, Dr. Hisataka Kobayashi, of the National Cancer Institute:

Shiv Gaglani, Medgadget: Your paper concludes, “Although GGT might not be a specific biomarker for all cancers, other probes similar to gGlu-HMRG can be developed for enzymes known to be located at the surface of tumors.” Can you comment on your plans or current research to develop probes for other tumor surface enzymes?

Dr. Kobayashi: Based on this same mechanism (spirocyclic caging) and others, we have synthesized various peptidase and glycosidase activatable probes. Now we are currently performing screening of those probes for selecting alternative or combinational probes.

Medgadget: What are the next steps for this particular technology? Any plans for clinical trials?

Dr. Kobayashi: We are performing a trial using fresh human cancer samples obtained in the surgery room to validate the efficacy of this gGlu probe for de novo human cancers. We are also planning to synthesize this probe in large scale with GMP-grade for large animal toxicology and phase 0/1, which is necessary for applying IND [Investigational New Drug] to US FDA. We are also planning trials in Japan under the Japanses regulation.

Paper in Science Translational Medicine: Rapid Cancer Detection by Topically Spraying a γ-Glutamyltranspeptidase–Activated Fluorescent Probe

Comment in STM: Glowing Tumors Make for Better Detection and Resection

Flashback: First Ovarian Cancer Surgeries Performed with Fluorescent-Guidance

Shiv Gaglani

Shiv Gaglani is an MD/MBA candidate at the Johns Hopkins School of Medicine and Harvard Business School. In addition to curating the Smartphone Physical (www.smartphonephysical.org), he also contributes regularly to CardioSource World News and Emergency Physicians Monthly. He is interested in developing scalable, tech-based solutions for medicine and education; to this end he is the co-founder of the medical education tech start-up, Osmosis (www.osmosis.org).  More about Shiv: http://about.me/sgaglani

Sponsored
Venture builder BHV Partners launches Conus Airway to improve anaesthesia  and respiratory surgery

Venture builder BHV Partners launches Conus Airway to improve anaesthesia and respiratory surgery

FDA Expands Indications for Use of FibroScan® for Comprehensive Liver Management

FDA Expands Indications for Use of FibroScan® for Comprehensive Liver Management

machineMD and Varjo revolutionize the diagnosis of brain disorders with a VR-based eye-tracking solution 

machineMD and Varjo revolutionize the diagnosis of brain disorders with a VR-based eye-tracking solution 

Ax-Surgi Hemostat gets FDA Clearance for Surgical Bleeding Control

Ax-Surgi Hemostat gets FDA Clearance for Surgical Bleeding Control

Clarius Report Finds 85% of Clinicians Believe Ultrasound Leads to Better Patient Outcomes

Clarius Report Finds 85% of Clinicians Believe Ultrasound Leads to Better Patient Outcomes

interviews & reviews
Levels Is Making Metabolism and Blood Glucose Tracking Accessible To Everyone

Levels Is Making Metabolism and Blood Glucose Tracking Accessible To Everyone

Imagene Profiles Cancer Biomarkers in Real Time

Imagene Profiles Cancer Biomarkers in Real Time

Empowering Stroke Survivors: Interview with Kirsten Carroll, CEO at Kandu Health

Empowering Stroke Survivors: Interview with Kirsten Carroll, CEO at Kandu Health

Alpha TAU Killing Tumors With Highly Targeted Alpha Radiation

Alpha TAU Killing Tumors With Highly Targeted Alpha Radiation

Neuroimmune Modulation for Inflammatory Disease: Interview with Dr. Simhambhatla, President and CEO of SetPoint Medical

Neuroimmune Modulation for Inflammatory Disease: Interview with Dr. Simhambhatla, President and CEO of SetPoint Medical

Exclusive Look at HandX Robotic-Assisted Surgical Device from Human Xtensions

Exclusive Look at HandX Robotic-Assisted Surgical Device from Human Xtensions

Balance Boards to Stay Active in the Offfice: Interview with Joel Heath, CEO of FluidStance 

Balance Boards to Stay Active in the Offfice: Interview with Joel Heath, CEO of FluidStance 

  • Subscribe
  • Contact us
  • Submit
  • About
  • Back to top
Medgadget

Medical technologies transform the world! Join us and see the progress in real time. At Medgadget, we report the latest technology news, interview leaders in the field, and file dispatches from medical events around the world since 2004.

  • About
  • Editorial policies
  • Contact
  • Terms of Service
  • Privacy
  • Submit press release
  • Advertise
© Medgadget, Inc. All rights reserved. | The Medical Revolution Will Be Blogged.
Please support this website by adding us to your whitelist in your ad blocker. Ads are what helps us bring you premium content! Thank you!
  • Facebook
  • Twitter
  • LinkedIn
  • Reddit
  • Email