News | PET-CT | June 14, 2017

Immuno-PET Shows Promise for Detecting and Treating Pancreatic Tumors

An antibody-based theranostic agent could help provide diagnosis and therapy for malignancies expressing the cancer antigen 19-9

Axial fused 89Zr-5B1 antibody PET/CT image demonstrates focus of uptake in the liver (arrow). Focus of uptake correlates with increased liver metastasis seen on diagnostic CT (red arrow) performed 2 weeks prior

Axial fused 89Zr-5B1 antibody PET/CT image demonstrates focus of uptake in the liver (arrow). Focus of uptake correlates with increased liver metastasis seen on diagnostic CT (red arrow) performed 2 weeks prior. Image courtesy of Christian Lohrmann, Jason Lewis, Wolfgang Weber, Memorial Sloan Kettering Cancer Center; MabVax Therapeutics

Pancreatic cancer is associated with bleak five-year survival rates and limited treatment options, but new research is offering hope. A first-in-human study presented at the 2017 Annual Meeting of the Society of Nuclear Medicine and Molecular Imaging (SNMMI) demonstrates the feasibility and safety of the novel human monoclonal antibody HuMab-5B1 with highly specific targeting for the cancer antigen (CA) 19-9, which is expressed on pancreatic tumors and a variety of other malignancies, including small cell lung cancer and tumors of the gastrointestinal system.

It holds the promise of better identifying tumors and directing treatment. "This new agent is intensely accumulated in pancreatic cancer and finds very small metastases with PET/CT imaging," explained Christian Lohrmann, M.D., lead author of the study from Memorial Sloan Kettering Cancer Center in New York, NY. "There are promising data that HuMab-5B1 could become a theranostic drug used in both targeted imaging and therapy, which could eventually improve the prognosis for pancreatic cancer patients."

The researchers evaluated the antibody with and without radiolabeling with zirconium-89 (89Zr-DFO-HuMab-5B1). With further validation, 89Zr-DFO-HuMab-5B1 could lead to a host of improvements in pancreatic cancer management--more accurate staging of tumors, better surgical guidance, restaging of metastases and potential drug selection for CA 19-9 targeted therapies. The high uptake of the antibody alone suggests that it could be used by itself, or radiolabeled, or coupled with another molecular compound to treat high-risk pancreatic tumors that are inoperable or metastatic.

For this study, nine patients with CA 19-9-positive metastatic malignancies underwent a series of four whole-body PET/CT scans--one the first day of injection with the imaging agent, then again on day two and around days four and seven. Subjects also received a diagnostic computed tomography (CT) scan of the chest, abdomen and pelvis within the four weeks leading up to baseline PET/CT. Results of the CT scan were used to verify the results of 89Zr-DFO-HuMab-5B PET/CT imaging.

Maximum standard uptake values normalized for body weight were analyzed for agent uptake in tumors. The agent was well tolerated and led to no serious side effects. Significant uptake was detected in local tumor recurrences as well as in metastases (for example in the lymph nodes, lungs, bone and peritoneum lining of the abdominal cavity). Uptake was analyzed for a total of 52 lesions. Highest uptake was shown on day seven in the lymph nodes. Results of the study showed that PET/CT imaging with the monoclonal antibody led to the detection of tiny tumors in the peritoneum and mesenteric lymph nodes that were not found by CT alone.

For more information: www.snmmi.org

Related Content

PET Tracer Identifies Estrogen Receptor Expression Differences in Breast Cancer Patients
News | PET Imaging | August 09, 2018
In metastatic breast cancer, prognosis and treatment is largely influenced by estrogen receptor (ER) expression of the...
Novel PET Imaging Method Could Track and Guide Type 1 Diabetes Therapy
News | PET Imaging | August 03, 2018
Researchers have discovered a new nuclear medicine test that could improve care of patients with type 1 diabetes. The...
Researchers Trace Parkinson’s Damage in the Heart
News | PET Imaging | July 17, 2018
A new way to examine stress and inflammation in the heart will help Parkinson’s researchers test new therapies and...
Siemens Healthineers Announces FDA Clearance of syngo.via VB30 Molecular Imaging Software
Technology | Nuclear Imaging | July 16, 2018
At the 2018 Annual Meeting of the Society of Nuclear Medicine and Molecular Imaging (SNMMI), June 23-26 in Philadelphia...
SNMMI Image of the Year Highlights Theranostic Approach for Advanced Prostate Cancer

IMAGE OF THE YEAR: PSMA PET before and after lutetium-177 PSMA617 theranostics in 8 patients with metastatic prostate cancer who exhausted standard therapeutic options.

68Ga-PSMA11 PET maximum intensity projection (MIP) images at baseline and 3 months after 177Lu-PSMA617 in 8 patients with PSA decline ≥ 98 percent in a prospective phase II study. Any disease with SUV over 3 is in red. Credit: Michael Hofman, John Violet, Shahneen Sandhu, Justin Ferdinandus, Amir Iravani, Grace Kong, Aravind Ravi Kumar, Tim Akhurst, Sue Ping Thang, Price Jackson, Mark Scalzo, Scott Williams and Rodney Hicks, Peter MacCallum Cancer Centre, Melbourne, Australia.

News | PET Imaging | June 29, 2018
In the battle against metastatic castrate-resistant prostate cancer, studies have demonstrated a high response rate to...
MILabs Introduces Futuristic PET Capabilities on New VECTor6 System
Technology | PET Imaging | June 28, 2018
At the 2018 Society of Nuclear Medicine and Molecular Imaging (SNMMI) annual meeting, June 23-26, in Philadelphia,...
Philips North America and GE Healthcare Win IMV PET Imaging ServiceTrak Awards
News | PET Imaging | June 25, 2018
IMV, part of the Science and Medicine Group and a market research and business intelligence provider to the imaging...
New ASNC SPECT Imaging Guideline Addresses Advances in Myocardial Perfusion Imaging
News | SPECT Imaging | June 21, 2018
The American Society of Nuclear Cardiology (ASNC) has published an update to its 2010 guidelines for single photon...
FDA Clears New Imaging Functionalities for Biograph mCT PET/CT Systems
Technology | PET-CT | June 21, 2018
Siemens Healthineers will announce U.S. Food and Drug Administration (FDA) clearance of four new system features for...
Overlay Init