Controlling the Redox Chemistry of Cobalt Radiopharmaceuticals.

The elementally matched Co (t=17.53 h, I=77 %)/Co (t=9.10 h, internal conversion=100 %) radioisotope pair is of interest for development of paired diagnostic/therapeutic radiopharmaceuticals.

Synthesis of Cu-, Co-, and Ga-Labeled Radiopharmaceuticals Targeting Neurotensin Receptor-1 for Theranostics: Adjusting In Vivo Distribution Using Multiamine Macrocycles.

The development of theranostic radiotracers relies on their binding to specific molecular markers of a particular disease and the use of corresponding radiopharmaceutical pairs thereafter. This study reports the use of multiamine macrocyclic moieties (MAs), as linkers or chelators, in tracers targeting the neurotensin receptor-1 (NTSR-1). The goal is to achieve elevated tumor uptake, minimal background interference, and prolonged tumor retention in NTSR-1-positive tumors.

Biparametric versus multiparametric MRI for the detection of clinically significant prostate cancer in a diverse, multiethnic population.

Purpose: There is not yet satisfactory performance data comparing multiparametric MRI (mpMRI) versus biparametric MRI (bpMRI) for detecting prostate cancer (PCa), particularly in high-risk populations. We compared both protocols for detecting overall PCa and clinically significant PCa (CS-PCa; defined as Grade Group ≥ 2) in a multiethnic urban population.

Methods: We retrospectively reviewed electronic medical record data from men who underwent image-guided fusion prostate biopsy (FB) between 2016 and 2021 at our institution.

Visible-light-mediated Diels-Alder reactions under single-chain polymer confinement: investigating the role of the crosslinking moiety on catalyst activity.

Macromolecular scaffolds are rapidly emerging in catalysis owing to the ability to control catalyst placement at precise locations. This spatial proximity allows for enhanced catalyst activity that may not be observed using small molecules. Herein, we describe a triphenylpyrylium (TPT)-based visible-light active single-chain polymer nanoparticle (SCNP) that facilitates the radical cation [4 + 2]-cycloaddition.

Preclinical development of novel PD-L1 tracers and first-in-human study of [Ga]Ga-NOTA-RW102 in patients with lung cancers.

Background: The programmed cell death protein-1 (PD-1)/programmed death receptor ligand 1 (PD-L1) axis critically facilitates cancer cells' immune evasion. Antibody therapeutics targeting the PD-1/PD-L1 axis have shown remarkable efficacy in various tumors. Immuno-positron emission tomography (ImmunoPET) imaging of PD-L1 expression may help reshape solid tumors' immunotherapy landscape.

Noninvasive PET imaging of tumor PD-L1 expression with Cu-labeled Durvalumab.

Breast cancer (BrCa) ranks as the most prevalent malignant neoplasm affecting women worldwide. The expression of programmed death-ligand 1 (PD-L1) in BrCa has recently emerged as a biomarker for immunotherapy response, but traditional immunohistochemistry (IHC)-based methods are hindered by spatial and temporal heterogeneity. Noninvasive and quantitative PD-L1 imaging using appropriate radiotracers can serve to determine PD-L1 expression in tumors.

Radiolabeling Diaminosarcophagine with Cyclotron-Produced Cobalt-55 and [Co]Co-NT-Sarcage as a Proof of Concept in a Murine Xenograft Model.

Cobalt-sarcophagine complexes exhibit high kinetic inertness under various stringent conditions, but there is limited literature on radiolabeling and in vivo positron emission tomography (PET) imaging using no carrier added Co. To fill this gap, this study first investigates the radiolabeling of DiAmSar (DSar) with Co, followed by stability evaluation in human serum and EDTA, pharmacokinetics in mice, and a direct comparison with [Co]CoCl to assess differences in pharmacokinetics. Furthermore, the radiolabeling process was successfully used to generate the NTSR1-targeted PET agent [Co]Co-NT-Sarcage (a DSar-functionalized SR142948 derivative) and administered to HT29 tumor xenografted mice.

Separation of cyclotron-produced cobalt-55/58m from iron targets using cation exchange chromatography with non-aqueous solvents and extraction chromatography.

Cobalt-55 and -58m form a theranostic pair that has relevant properties for cancer research. We report a cation exchange chromatography/extraction chromatography method that separates cyclotron-produced Co from Fe in <1.5 h, recovers >85% Co and achieves [Co]Co-NOTA and -DOTA AMA 89 ± 48 and 35 ± 7 MBq/nmol (EOB), respectively.

Theranostic cobalt-55/58m for neurotensin receptor-mediated radiotherapy in vivo: A pilot study with dosimetry.

Unlabelled: Neurotensin receptor 1 (NTSR1) can stimulate tumor proliferation through neurotensin (NTS) activation and are overexpressed by a variety of cancers. The high binding affinity of NTS/NTSR1 makes radiolabeled NTS derivatives interesting for cancer diagnosis and staging. Internalization of NTS/NTSR1 also suggests therapeutic application with high LET alpha particles and low energy electrons.

PET Imaging of the Neurotensin Targeting Peptide NOTA-NT-20.3 Using Cobalt-55, Copper-64 and Gallium-68.

Introduction: Neurotensin receptor 1 (NTSR1) is an emerging target for imaging and therapy of many types of cancer. Nuclear imaging of NTSR1 allows for noninvasive assessment of the receptor levels of NTSR1 on the primary tumor, as well as potential metastases. This work focuses on a the neurotensin peptide analogue NT-20.

Excitation function of Fe(p,)Mn from 9.5 MeV to 18 MeV.

Excitation function of the Fe(p,)51Mn reaction was measured from 9.5 to 18 MeV by activating a foil stack of Fe electrodeposited on copper substrates. Residual radionuclides were quantified by HPGe gamma ray spectrometry.

Patient Perceptions of Video Visits in a Fee-for-Service Model.

Introduction: We studied perceptions of patients who receive telemedicine services in the fee-for-service setting of an academic medical center's family medicine department. To the best of our knowledge, this study is the first to investigate patient sentiments on both experiential and financial aspects of telemedicine primary care with copayment collection.

Methods: A 53-question cross-sectional digital survey was delivered to patients' e-mail addresses after their telemedicine visit.

Open-Shell Nanosensitizers for Glutathione Responsive Cancer Sonodynamic Therapy.

Deleterious effects to normal tissues and short biological half-life of sonosensitizers limit the applications of sonodynamic therapy (SDT). Herein, a new sonosensitizer (Cu(II)NS) is synthesized that consists of porphyrins, chelated Cu , and poly(ethylene glycol) (PEG) to overcome the challenges of SDT. As Cu contains 27 electrons, Cu(II)NS has an unpaired electron (open shell), resulting in a doublet ground state and little sonosensitivity.

Production, Purification, and Applications of a Potential Theranostic Pair: Cobalt-55 and Cobalt-58m.

The emerging success of [Ga/Lu]Ga/Lu-DOTATATE as a theranostic pair has spurred interest in other isotopes as potential theranostic combinations. Here, we review cobalt-55 and cobalt-58m as a potential theranostic pair. Radionuclidically pure cobalt-55 and cobalt-58m have been produced on small cyclotrons with high molar activity.

Use of beta-blocker types and risk of incident prostate cancer in a multiethnic population.

Purpose: Increased adrenergic innervation is observed in prostate cancer (CaP) and is associated with aggressive disease. Emerging evidence suggests that beta-adrenergic blockade inhibits CaP progression. However, the association between type of beta-blocker use and risk of incident CaP on initial prostate biopsy has not been investigated in multiethnic populations.

Non-Familial Synchronous Bilateral Renal Cell Carcinoma with Bilateral Synchronous Renal Vein Extension and Inferior Vena Cava Thrombus.

Bilateral renal cell carcinoma with tumor thrombus extension into the renal vein and/or inferior vena cava - clinical stage T3a+ - is rare. The majority of these cases arise due to a genetic predisposition. We present a case report of a 47-year-old male with bilateral, synchronous renal cell carcinoma with bilateral renal vein and inferior vena cava tumor thrombi with no identifiable familial predisposition.

Baseline chronic kidney disease does not predict long-term renal functional decline after percutaneous nephrolithotomy.

To compare renal functional outcomes in patients with and without chronic kidney disease (CKD) to identify predictors of change in renal function after percutaneous nephrolithotomy (PCNL). We reviewed patients who underwent PCNL by a single surgeon over 3.5 years.

Addressing the challenges of reoperative robotic-assisted sacrocolpopexy.

Sacrocolpopexy is the gold-standard repair for apical pelvic organ prolapse (POP). However, over half of women with POP who undergo the surgery experience recurrence, particularly those with higher preoperative stage, younger age, and greater body weight. We address the challenges of repairing recurrent POP in a patient with a prior transabdominal mesh sacrohysteropexy.

Anatomic Reasons for Failure to Visualize the Appendix With Graded Compression Sonography: Insights From Contemporaneous CT.

Objective: The purpose of this study is to identify the anatomic locations of appendixes on CT when graded compression sonography fails to visualize the appendix.

Materials And Methods: The study included 197 patients with suspected appendicitis whose appendixes were not visualized on graded compression sonography performed with typically used transducers of at least 10 MHz, who underwent CT within 48 hours following graded compression sonography, and who had available either pathologic examination following surgery or 6-week follow-up if surgery was not performed. Appendixes were retrospectively localized using four transverse quadrants (including the posteromedial quadrant) centered on the ileocecal valve and projected vertically, the craniocaudal level relative to the iliac crests, and the depth of the appendix as measured from the surface of the skin.

Five-year outcomes of an oropharynx-directed treatment approach for unknown primary of the head and neck.

Purpose: Squamous cell carcinoma of unknown primary (SCCHNUP) is commonly treated with comprehensive radiation to the laryngopharynx and bilateral necks. In 1998, we established a departmental policy to treat SCCHNUP with radiation directed to the oropharynx and bilateral neck.

Methods: From 1998-2011, 60 patients were treated - N1: 18%, N2: 75% and N3: 7%.

Low rates of contralateral neck failure in unilaterally treated oropharyngeal squamous cell carcinoma with prospectively defined criteria of lateralization.

Background: Unilateral radiotherapy (RT) of oropharyngeal carcinomas is accepted for patients with lateralized primary and low-volume nodal disease. Utilizing prospectively defined criteria of laterality and staging positron emission tomography (PET)/CT, we studied outcomes in patients with advanced-stage oropharyngeal cancer undergoing unilateral RT.

Methods: Thirty-seven patients with oropharyngeal tumors >1 cm from midline regardless of node status underwent unilateral RT and were followed prospectively.

Initial experience with oropharynx-targeted radiation therapy for metastatic squamous cell carcinoma of unknown primary of the head and neck.

Aim: Metastasis of unknown primary (MUP) is commonly treated with radiation therapy (RT) to the entire mucosal surfaces and bilateral neck nodes (LN). We report outcomes of oropharynx-targeted RT, retropharyngeal nodes (RPN) and bilateral LN in this context.

Patients And Methods: Single-Institution retrospective study of 68 patients.

Long-term outcome of seropositive HIV patients with head and neck squamous cell carcinoma treated with radiation therapy and chemotherapy.

Aim: To report the outcome of radiation therapy (RT) +/- chemotherapy in HIV-seropositive patients with Head and Neck Squamous Cell Carcinoma (HNSCC).

Patients And Methods: This is the largest single-Institution retrospective study to date, consisting of 73 HIV patients with HNSCC treated from January 1997-2010. The median age at RT, HIV diagnosis and the duration of patients being HIV seropositive were 51, 34, and 11 years, respectively.