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Engineering in Medicine and Biology Society

Santa Clara Valley Chapter Monthly Meeting

SCV EMBS Meetings are usually scheduled for the third Wednesday of each month, except July, August, and December. The formal presentation is 7:30 - 8:30 pm. Afterwards, there is an opportunity to network.

The usual meeting location is in Room M114 of the Medical School on Stanford Campus). M114 is in the corner closest to the Clark Bioscience Building.

Meet the Speaker
An optional, no-host dinner with the speaker precedes each meeting, and you are invited. We gather in the Stanford Hospital cafeteria at 6:15 pm. No reservation is needed.

Upcoming EMBS Meeting
Wednesday, April 19, 2017 at 7:30pm
Room M-114, Stanford University Medical School

Study of Fluorescence Spectroscopy Guided Optical Biopsy Needle for Prostate Cancer Diagnosis
Speaker: Amir Tehrani
CEO, Precision Biopsy, LLC

Abstract Summary:
Current prostate biopsy cores have a very low diagnostic yield. These biopsies often fail to diagnose prostate cancer since 90% of cores are histopathologically classified as benign. The concentrations of endogenous fluorophores in prostate tissue vary with disease states. Thus, fluorescence spectroscopy could be utilized to quantify these variations for identification of malignant lesions. We investigated clinical feasibility of a 14 gauge (1.98 mm) optical biopsy needle guided by fluorescence spectroscopy for real-time in vivo prostate cancer diagnosis. Built-in optical sensor has 8x100 µm fibers for tissue excitation and a single 200 µm fiber to collect spectral data. Custom-made fluorometer has 2 light-emitting diodes at 290 and 340 nm and a spectrometer. User interface for fluorometer operation and data collection was developed using LabView software. Each spectral data acquisition required ~2 seconds. The in vivo biopsies were performed during radical retropubic prostatectomy surgery on the exposed prostate with blood flow to the gland intact. A tissue biopsy core was obtained from each biopsy site after acquisition of spectral data. Above procedure was repeated ex vivo after surgical excision of the prostate. Biopsy cores were histopathologically classified as either benign or malignant and correlated with corresponding spectral data. Partial Least Square analysis was performed to determine diagnostically significant principal components as potential classifiers. A linear support vector machine and leaveone-out cross validation method was employed for tissue classification. Thirteen patients were consented to the study. Histopathological analysis found cancer in 29/208 in vivo and 51/224 ex vivo viable biopsy cores. Study results show 72% sensitivity, 66% specificity, and 93% negative predictive value for in vivo and 75%, 80%, and 93%, respectively, for ex vivo malignant versus benign prostatic tissue classification. Optical biopsy needle has a very high negative predictive value to indicate benign tissue while sufficient sensitivity for targeting areas suspicious for cancer within the prostate gland. Hence, the optical biopsy needle can increase the diagnostic yield of prostate biopsies with consequent improvement in patient care.

Biography Summary:
Precision Biopsy is led by CEO Amir Tehrani, who has over 20 years of experience in management and operations, strategy, business development, marketing, design and development for Fortune 500 and start-up medical device companies. Prior to Precision Biopsy, Amir was the President and CEO of Amaranth Medical, Inc., a bioabsorbable stent company. He has been instrumental in the formation and financing of several medical device companies, including Inspiration Medical, Inc., Corventis, Inc. (acquired by Medtronic, Inc.), Spinal Modulation, Inc., (acquired by St. Jude Medical), Sonitus Medical, Inc., and RODO Medical, Inc. Amir also led successful investments and acquisition in the medical technology sector at Guidant Compass Group. He also held several leading marketing and engineering positions at Guidant Vascular Intervention, St. Jude Medial CRM Division, Ventritex, Inc., (acquired by St. Jude Medical), and MiniMed, Inc. (acquired by Medtronic, Inc.). Amir holds a BS in Electrical Engineering from the University of Idaho and an MS in Biomedical Engineering from California State University in Sacramento, CA.

Parking at Stanford
Parking is available in the structure at the corner of East Campus Drive and Roth Way. Parking is free after 4pm.
Parking is also available in the Stanford hospital parking structure off Pasteur Drive and Blake Wilbur Drive, but there is a fee.

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