Head-to-Head Study Comparing Navidea's AZD4694 to the Gold Standard for Imaging Beta Amyloid Protein Deposits Presented at Alzheimer's Association International Conference
Trial Examines AZD4694 Performance Characteristics and Blinded Reader Confidence when used as an Aid in Diagnosing Alzheimer's Disease
DUBLIN, Ohio--(BUSINESS WIRE)--Jul 23, 2012 - Navidea Biopharmaceuticals, Inc. (NYSE MKT: NAVB), a specialty pharmaceutical company focused on precision diagnostic radiopharmaceuticals, today announced that clinical data from a head-to head study comparing its amyloid imaging candidate, AZD4694, to the benchmark amyloid imaging agent, 11C-PiB (PiB), was presented at the Alzheimer's Association International Conference – AAIC in Vancouver, Canada by Professor Christopher Rowe, MD, FRACP, Director of the Department of Nuclear Medicine and Centre for PET at Austin Health, Melbourne, Australia.
In addition, on Friday, July 13, 2012, Navidea received approval for its Phase 2 AZD4694 protocol from the New England Institutional Review Board (IRB), a centralized IRB that oversees the approval of clinical protocols for investigational drugs for multiple research organizations. Trial enrollment is expected to commence in the coming months.
“We are extremely pleased with Dr. Rowe's encouraging findings demonstrating strong similarity of AZD4694 to the long-standing agent of choice, PiB. These and other data continue to confirm AZD4694's outstanding performance characteristics,” commented Dr. Mark Pykett, Navidea's President and CEO. “We are also excited with the approval by the IRB of the Phase 2 protocol and look forward to rapidly commencing these studies as well as beginning Phase 3 clinical studies for this agent in early 2013.”
“We are enthusiastic about the potential of this agent to facilitate research, diagnosis and therapeutic development for Alzheimer's disease,” said Dr. Rowe. “As a second-generation beta amyloid tracer for PET scans, 18F-AZD4694 combines the best features of the two current types of imaging agents -- the convenience of a fluorine-18 label, and favorable sensitivity, selectivity and decreased white matter binding which offers improved image clarity.”
Dr. Rowe's talk was entitled, “Head to head comparison of 11C-PiB and 18F-AZD4694 for AÎ² imaging in ageing and dementia.” The presentation highlighted new results from a blinded-reader analysis which examined imaging characteristics such as binding kinetics, standard uptake value ratios (SUVR) in three time intervals, and non-specific white-matter retention for these agents obtained in the same subjects. The two agents, 11C-PiB and 18F-AZD4694, were employed to sequentially image the brains of forty-five participants (25 healthy elderly controls, 10 subjects with Mild Cognitive Impairment, 7 subjects with probable Alzheimer's Disease and 3 subjects with fronto-temporal dementia). The mean age of the participant groups was about 74, except that the three fronto-temporal dementia patients averaged about 68 years old. Cognitive impairments in the patient groups showed mean scores on the Mini-Mental State Examination of 24 to 27 and were within the mild to moderate range.
As previously reported, quantitative measures, such as SUVR, of 18F-AZD4694 binding to cortical amyloid plaques are essentially identical to 11C-PiB. A very tight performance correlation was observed (r=0.98, p<0.0001; slope 0.95). Visually, images obtained in the same patient with the same scan times, the same data processing and the same display scales, were identical. 18F-AZD4694 had comparable binding kinetics and dynamic range of SUVR to the benchmark 11C-PiB as well as similar high values of cortex to white matter ratios. Using the PiB as reference, the sensitivity, specificity, and overall accuracy within the 40- to 60-minute readings ranged from 94% to 98%. Additionally, confidence levels from the blinded readers averaged 93% using 40- to 60- minute readings, indicating a high degree of confidence in the interpretability of the images within this time range.
AZD4694 is a Fluorine-18 labeled precision radiopharmaceutical candidate for use in the imaging and evaluation of patients with signs or symptoms of cognitive impairment such as AD. It binds to Beta-amyloid deposits in the brain that can then be imaged in positron emission tomography (PET) scans. Amyloid plaque pathology is a required feature of AD diagnosis and the presence of amyloid pathology is a supportive feature for diagnosis of probable AD.
About Navidea Biopharmaceuticals, Inc.
Navidea Biopharmaceuticals, Inc. (NYSE MKT: NAVB) is a biopharmaceutical company focused on the development and commercialization of precision diagnostics and radiopharmaceutical agents. Navidea is actively developing three radiopharmaceutical agent platforms – Lymphoseek®, AZD4694 and RIGScanTM – to help identify the sites and pathways of undetected disease and enable better diagnostic accuracy, clinical decision-making and ultimately patient care. Navidea's strategy is to deliver superior growth and shareholder return by bringing to market novel radiopharmaceutical agents and advancing the Company's pipeline through selective acquisitions, global partnering and commercialization efforts. For more information, please visit www.navidea.com.
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Contact: Navidea Biopharmaceuticals, Inc.
Brent Larson, 614-822-2330
Sr. VP & CFO
Posted: July 2012