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https://www.readbyqxmd.com/read/28819703/novel-prostate-cancer-immunotherapy-with-a-dna-encoded-anti-prostate-specific-membrane-antigen-monoclonal-antibody
#1
Kar Muthumani, Liron Marnin, Sagar B Kudchodkar, Alfredo Perales-Puchalt, Hyeree Choi, Sangya Agarwal, Veronica L Scott, Emma L Reuschel, Faraz I Zaidi, Elizabeth K Duperret, Megan C Wise, Kimberly A Kraynyak, Kenneth E Ugen, Niranjan Y Sardesai, J Joseph Kim, David B Weiner
Prostate-specific membrane antigen (PSMA) is expressed at high levels on malignant prostate cells and is likely an important therapeutic target for the treatment of prostate carcinoma. Current immunotherapy approaches to target PSMA include peptide, cell, vector or DNA-based vaccines as well as passive administration of PSMA-specific monoclonal antibodies (mAb). Conventional mAb immunotherapy has numerous logistical and practical limitations, including high production costs and a requirement for frequent dosing due to short mAb serum half-life...
August 17, 2017: Cancer Immunology, Immunotherapy: CII
https://www.readbyqxmd.com/read/28818992/long-half-life-89-zr-labeled-radiotracers-can-guide-in-suite-percutaneous-molecular-imaging-pet-ct-guided-biopsies-without-reinjection-of-radiotracer
#2
Francois H Cornelis, Jeremy Durack, Neeta Pandit-Taskar, Gary A Ulaner, Jason S Lewis, Michael J Morris, Stephen B Solomon
Rationale: To evaluate the feasibility of in suite Zr89 labeled radiotracer positron emission tomography-computed tomography (PET/CT)-guided biopsies performed without reinjection. Methods: From 2013-2016, 12 patients (7 males, 5 females; mean age 61 years, range 40-75) with suspected metastatic prostate or breast carcinoma on either imaging or biochemical progression underwent 14 percutaneous biopsies after diagnostic PET/CT using (89)Zr labeled radiotracers (mean dose: 180MBq; range: 126-189MBq) targeting prostate specific membrane antigen (PSMA) (n = 7) or human epidermal growth factor receptor 2 (HER2) (n = 5)...
August 17, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28817656/investigation-of-the-halo-artifact-in-68ga-psma-11-pet-mri
#3
Thorsten Heußer, Philipp Mann, Christopher M Rank, Martin Schäfer, Antonia Dimitrakopoulou-Strauss, Heinz-Peter Schlemmer, Boris A Hadaschik, Klaus Kopka, Peter Bachert, Marc Kachelrieß, Martin T Freitag
OBJECTIVES: Combined positron emission tomography (PET) and magnetic resonance imaging (MRI) targeting the prostate-specific membrane antigen (PSMA) with a 68Ga-labelled PSMA-analog (68Ga-PSMA-11) is discussed as a promising diagnostic method for patients with suspicion or history of prostate cancer. One potential drawback of this method are severe photopenic (halo-) artifacts surrounding the bladder and the kidneys in the scatter-corrected PET images, which have been reported to occur frequently in clinical practice...
2017: PloS One
https://www.readbyqxmd.com/read/28815472/comparison-of-pet-ct-and-whole-mount-histopathology-sections-of-the-human-prostate-a-new-strategy-for-voxel-wise-evaluation
#4
F Schiller, T Fechter, C Zamboglou, A Chirindel, N Salman, C A Jilg, V Drendel, M Werner, P T Meyer, A-L Grosu, M Mix
BACKGROUND: Implementation of PET/CT in diagnosis of primary prostate cancer (PCa) requires a profound knowledge about the tracer, preferably from a quantitative evaluation. Direct visual comparison of PET/CT slices to whole prostate sections is hampered by considerable uncertainties from imperfect coregistration and fundamentally different image modalities. In the current study, we present a novel method for advanced voxel-wise comparison of histopathology from excised prostates to pre-surgical PET...
August 17, 2017: EJNMMI Physics
https://www.readbyqxmd.com/read/28806262/an-unusual-case-of-penile-prostate-cancer-uncovered-by-multiparametric-mri-and-psma-targeted-18f-dcfpyl-pet-ct
#5
Steven P Rowe, Michael A Gorin, Linda C Chu, Kenneth J Pienta, Martin G Pomper, Ashley E Ross, Katarzyna J Macura
Multiparametric MRI (mpMRI) is currently the test of choice for imaging sites of prostate cancer located within the pelvis. However, molecular imaging with PET radiotracers that bind to prostate-specific membrane antigen is increasingly being used for this purpose and may compliment mpMRI findings. We present a case of a 59-year-old man with elevated postprostatectomy serum prostate-specific antigen level who was found on both mpMRI and prostate-specific membrane antigen-targeted PET to harbor residual prostate cancer in the corpus spongiosum along the proximal urethra...
August 12, 2017: Clinical Nuclear Medicine
https://www.readbyqxmd.com/read/28806260/68ga-psma-ligand-pet-ct-uptake-in-anthracosilicosis
#6
Madeleine McGuiness, Brett Sounness
This interesting image illustrates a case of biopsy-proven pulmonary anthracosilicosis, a mixed dust pneumoconiosis, associated with Ga-PSMA-ligand uptake. Prostate-specific membrane antigen (PSMA) is an emerging imaging biomarker, with clinical application in evaluation of prostate cancer using Ga-PSMA-ligand PET/CT. Contrary to its name, PSMA is expressed in a number of other normal tissues and pathological states. Prostate-specific membrane antigen expression has been linked to tumor angiogenesis in various other epithelial neoplasms, as well as neovasculature associated with tissue regeneration and repair...
August 12, 2017: Clinical Nuclear Medicine
https://www.readbyqxmd.com/read/28806238/68ga-psma-uptake-in-combined-hepatocellular-cholangiocarcinoma-with-skeletal-metastases
#7
Ramin Alipour, Sandeep Gupta, Scott Trethewey
Ga-PSMA PET is a rapidly evolving imaging modality for whole-body staging of prostate cancer. We report a case of a 70-year-old man with mildly elevated prostate-specific antigen (8.1 μg/L) and clinical suspicion of prostate cancer (osteoblastic metastases on radionuclide bone scan) who was referred for Ga-PSMA PET/CT for primary staging. Multiple Ga-PSMA-avid skeletal foci, mostly associated with lytic changes on low-dose CT, as well as hepatic foci of avid Ga-PSMA uptake, were identified. No abnormal focus of avid Ga-PSMA uptake was identified in the prostate...
August 12, 2017: Clinical Nuclear Medicine
https://www.readbyqxmd.com/read/28803001/continuation-of-comprehensive-quality-control-of-the-itg-68-ge-68-ga-generator-and-production-of-68-ga-dotatoc-and-68-ga-psma-hbed-cc-for-clinical-research-studies
#8
Alejandro Amor-Coarasa, James M Kelly, Monika Gruca, Anastasia Nikolopoulou, Shankar Vallabhajosula, John W Babich
Performance of a second itG (68)Ge/(68)Ga generator system and production of (68)Ga-DOTATOC and (68)Ga-PSMA-HBED-CC were tested over one year as an accompaniment to a previously published study (J Nucl Med. 2016;57:1402-1405). METHODS: Performance of a 1951MBq (68)Ge/(68)Ga generator was characterized and the eluate used for preparation of (68)Ga-DOTATOC and (68)Ga-PSMA-HBED-CC. Weekly elution profiles of (68)Ga elution yield and (68)Ge breakthrough were determined. RESULTS: (68)Ga elution yields averaged 82% (61...
July 14, 2017: Nuclear Medicine and Biology
https://www.readbyqxmd.com/read/28801787/reduction-of-68-ga-psma-renal-uptake-with-mannitol-infusion-preliminary-results
#9
Federica Matteucci, Emilio Mezzenga, Paola Caroli, Valentina Di Iorio, Anna Sarnelli, Monica Celli, Lorenzo Fantini, Andrea Moretti, Riccardo Galassi, Ugo De Giorgi, Giovanni Paganelli
PURPOSE: Urea-based prostate-specific membrane antigen (PSMA) ligands labelled with (68)Ga or (177)Lu are new tracers with great potential for theranostic approaches in prostate cancer. However, clinical studies have shown that the kidneys are one of the off-target organs along with the salivary and lacrimal glands. In the kidneys, PSMA is physiologically expressed in the apical epithelium of the proximal tubules, and mannitol acts as an osmotic diuretic in these tubules. We investigated the potential of mannitol to reduce renal uptake of (68)Ga-PSMA...
August 11, 2017: European Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/28798031/repeated-lu-177-psma-617-radioligand-therapy-using-treatment-activities-up-to-9-3-gbq
#10
Hendrik Rathke, Frederik L Giesel, Paul Flechsig, Klaus Kopka, Walter Mier, Markus Hohenfellner, Uwe Haberkorn, Clemens Kratochwil
Current treatment protocols for (177)Lu-PSMA-617 therapies were cautiously derived from dosimetry data, but their practical appropriateness have not yet been proven clinically. We retrospectively report our clinical observations using four different treatment activities. Methods: Forty patients with advanced prostate cancer and positive uptake in PSMA-imaging were treated in fractions of 4 GBq / 80 nmol, 6 GBq / 120 nmol, 7.4 GBq / 150 nmol or 9.3 GBq / 150 nmol (177)Lu-activity / precursor-amount (n = 10, respectively) every 2 months...
August 10, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28797928/comparison-of-planar-pet-and-well-counter-measurements-of-total-tumor-radioactivity-in-a-mouse-xenograft-model
#11
Michael V Green, Jurgen Seidel, Mark R Williams, Karen J Wong, Anita Ton, Falguni Basuli, Peter L Choyke, Elaine M Jagoda
INTRODUCTION: Quantitative small animal radionuclide imaging studies are often carried out with the intention of estimating the total radioactivity content of various tissues such as the radioactivity content of mouse xenograft tumors exposed to putative diagnostic or therapeutic agents. We show that for at least one specific application, positron projection imaging (PPI) and PET yield comparable estimates of absolute total tumor activity and that both of these estimates are highly correlated with direct well-counting of these same tumors...
June 30, 2017: Nuclear Medicine and Biology
https://www.readbyqxmd.com/read/28795303/the-feasibility-of-prostate-specific-membrane-antigen-positron-emission-tomography-psma-pet-ct-guided-radiotherapy-in-oligometastatic-prostate-cancer-patients
#12
O C Guler, B Engels, C Onal, H Everaert, R Van den Begin, T Gevaert, M de Ridder
BACKGROUND: To investigate the efficacy and toxicity of 68Ga-PSMA-HBED-CC ((68)Ga-PSMA) PET-CT-guided RT in the treatment of oligometastatic prostate cancer retrospectively. METHODS: A total of 23 prostate cancer patients with biochemical relapse, of which 13 were castration sensitive (CS) and 10 castration resistant (CR), were treated with intensity-modulated and image-guided RT (IMRT-IGRT) on ≤3 metastases detected by (68)Ga PSMA PET-CT. Androgen deprivation therapy was continued in CR patients...
August 9, 2017: Clinical & Translational Oncology
https://www.readbyqxmd.com/read/28794625/paclitaxel-loaded-and-a10-3-2-aptamer-targeted-poly-lactide-co-glycolic-acid-nanobubbles-for-ultrasound-imaging-and-therapy-of-prostate-cancer
#13
Meng Wu, Ying Wang, Yiru Wang, Mingbo Zhang, Yukun Luo, Jie Tang, Zhigang Wang, Dong Wang, Lan Hao, Zhibiao Wang
In the current study, we synthesized prostate cancer-targeting poly(lactide-co-glycolic acid) (PLGA) nanobubbles (NBs) modified using A10-3.2 aptamers targeted to prostate-specific membrane antigen (PSMA) and encapsulated paclitaxel (PTX). We also investigated their impact on ultrasound (US) imaging and therapy of prostate cancer. PTX-A10-3.2-PLGA NBs were developed using water-in-oil-in-water (water/oil/water) double emulsion and carbodiimide chemistry approaches. Fluorescence imaging together with flow cytometry verified that the PTX-A10-3...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28777073/multimodality-image-fusion-with-psma-pet-ct-and-high-intensity-focused-ultrasound-focal-therapy-for-primary-diagnosis-and-management-of-prostate-cancer-a-planned-research-initiative
#14
Marcia C Javitt, Alexander Kravtsov, Zohar Keidar, Sobhi Abadi, Gilad Amiel
Recent developments in diagnostic imaging herald a new approach to diagnosis and management of prostate cancer. Multimodality fusion that combines anatomic with functional imaging data has surpassed either of the two alone. This opens up the possibility to "find and fix" malignancy with greater accuracy than ever before. This is particularly important for prostate cancer because it is the most common male cancer in most developed countries. This article describes technical advances under investigation at our institution and others using multimodality image fusion of magnetic resonance imaging (MRI), transrectal ultrasound (TRUS), and PSMA PET/CT (defined as the combination of prostate-specific membrane antigen [PSMA], positron emission tomography [PET], and computed tomography [CT]) for personalized medicine in the diagnosis and focal therapy of prostate cancer with high-intensity focused ultrasound (HiFUS)...
August 3, 2017: Rambam Maimonides Medical Journal
https://www.readbyqxmd.com/read/28775203/immunohistochemical-validation-of-psma-expression-measured-by-68-ga-psma-pet-ct-in-primary-prostate-cancer
#15
Nadine Woythal, Ruza Arsenic, Carsten Kempkensteffen, Kurt Miller, Jan-Carlo Janssen, Kai Huang, Marcus R Makowski, Winfried Brenner, Vikas Prasad
Aim: Gallium 68 ((68)Ga) prostate specific membrane antigen (PSMA) positron emission tomography/computed tomography ((68)Ga-PSMA PET/CT) has a proven role in staging and restaging of prostate cancer (PCA) patients. The aims of this study were to evaluate the association of intraprostatic (68)Ga-PSMA PET/CT (PET) findings and prostate specific membrane antigen (PSMA) expression in immunohistochemical staining (IHC) and generate a cut-off value for the differentiation between benign prostate tissue from PCA. Methods: Data of 31 patients (mean 67...
August 3, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28765999/a-rare-case-of-thymoma-first-detected-on-gallium-68-psma-pet-ct
#16
Hian Liang Huang, Angela Renayanti Dharmawan, Colin Jingxian Tan, Sue Ping Thang
No abstract text is available yet for this article.
August 1, 2017: European Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/28765998/pearls-and-pitfalls-in-clinical-interpretation-of-prostate-specific-membrane-antigen-psma-targeted-pet-imaging
#17
REVIEW
Sara Sheikhbahaei, Ali Afshar-Oromieh, Matthias Eiber, Lilja B Solnes, Mehrbod S Javadi, Ashley E Ross, Kenneth J Pienta, Mohamad E Allaf, Uwe Haberkorn, Martin G Pomper, Michael A Gorin, Steven P Rowe
BACKGROUND: The rapidly expanding clinical adaptation of prostate-specific membrane antigen (PSMA)-targeted PET imaging in the evaluation of patients with prostate cancer has placed an increasing onus on understanding both the potential pearls of interpretation as well as limitations of this new technique. As with any new molecular imaging modality, accurate characterization of abnormalities on PSMA-targeted PET imaging can be accomplished only if one is aware of the normal distribution pattern, physiological variants of radiotracer uptake, and potential sources of false-positive and false-negative imaging findings...
August 1, 2017: European Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/28762517/immunoaffinity-based-methods-are-superior-to-kits-for-purification-of-prostate-derived-extracellular-vesicles-from-plasma-samples
#18
Sabine I Brett, Fabrice Lucien, Charles Guo, Karla C Williams, Yohan Kim, Paul N Durfee, C J Brinker, Joseph I Chin, Jun Yang, Hon S Leong
BACKGROUND: The ability to isolate extracellular vesicles (EVs) such as exosomes or microparticles is an important method that is currently not standardized. While commercially available kits offer purification of EVs from biofluids, such purified EV samples will also contain non-EV entities such as soluble protein and nucleic acids that could confound subsequent experimentation. Ideally, only EVs would be isolated and no soluble protein would be present in the final EV preparation. METHODS: We compared commercially available EV isolation kits with immunoaffinity purification techniques and evaluated our final EV preparations using atomic force microscopy (AFM) and nanoscale flow cytometry (NFC)...
August 1, 2017: Prostate
https://www.readbyqxmd.com/read/28762288/the-phytological-future-of-prostate-cancer-staging-prostate-specific-membrane-antigen-positron-emission-tomography-and-the-dandelion-theory
#19
Niranjan J Sathianathen, Nicolas Geurts, Rajesh Nair, Nathan Lawrentschuk, Declan G Murphy, Alastair D Lamb
PSMA-PET is changing how we stage prostate cancer, both in the primary setting and with relapse after treatment. It allows us to identify lesions in the bones and lymph nodes that were not previously visible on conventional imaging with bone scan and CT/MRI. In this Special Report we review the 'state of the art' for PSMA imaging and discuss the implications for treatment decisions in prostate cancer. We liken early high risk or metastatic prostate to a common phytological problem: the dandelion. In this analogous situation, we consider the additional evidence needed for us to start plucking out the original dandelion and for us to focus attention on killing the seeded weeds that are identifiable elsewhere in the lawn...
August 1, 2017: Future Oncology
https://www.readbyqxmd.com/read/28759526/68ga-psma-uptake-in-an-incidentally-detected-gastrointestinal-stromal-tumor-in-a-case-of-suspected-carcinoma-prostate
#20
Arun Sasikumar, Ajith Joy, Mra Pillai, Bindu S, Sudin Sr
A 74-year-old man with suspected prostate cancer and a previously negative transrectal ultrasound-guided prostate biopsy underwent Ga-PSMA PET/CT. Scan showed no abnormal tracer concentration in enlarged prostate gland to suggest prostate cancer. Note was made of an incidentally detected well defined soft tissue lesion in the greater curvature of the stomach with moderate tracer concentration in its intraluminal portion. Biopsy of the lesion revealed gastrointestinal stromal tumor.
July 29, 2017: Clinical Nuclear Medicine
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