Publications by authors named "Rahbar K"

Introduction: Prostate cancer (PCa) is the most commonly diagnosed cancer in men in the United States, following skin cancer, with an incidence rate of 112.7 per 100,000 men per year. The need for a reliable, non-invasive diagnostic tool for early PCa detection (screening, biochemical residual disease) remains unmet due to the limitations of PSA testing, which often leads to overdiagnosis and overtreatment.

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Background: [Lu]Lu-PSMA-617 (Lu-PSMA-617) prolonged life in patients with metastatic castration-resistant prostate cancer (mCRPC) in VISION (NCT03511664). However, distinguishing between patients likely and unlikely to respond remains a clinical challenge. We present the first multivariable models of outcomes with Lu-PSMA-617 built using data from VISION, a large prospective phase 3 clinical trial powered for overall survival.

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Article Synopsis
  • The study aimed to compare interim PSMA-PET imaging with post-treatment whole-body scans (WBS) in monitoring treatment response for men with metastasized castration-resistant prostate cancer (mCRPC) undergoing radioligand therapy (RLT).
  • Researchers included 188 men and found a strong correlation between responses measured by the two imaging methods, indicating that both affect overall survival (OS) outcomes significantly.
  • Results suggested that early treatment responses, particularly a PSA decline of 50% after two cycles, were associated with improved survival probabilities, highlighting the importance of interim imaging in therapy monitoring.
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Background And Objective: The prognostic value of declining prostate-specific antigen (PSA) levels is under investigation in patients with prostate-specific membrane antigen (PSMA)-positive metastatic castration-resistant prostate cancer (mCRPC) receiving PSMA-targeted radioligand therapy with [Lu]Lu-PSMA-617 (Lu-PSMA-617). This post hoc analysis of the phase 3 VISION trial aimed to evaluate associations between PSA decline and clinical and patient-reported outcomes in patients receiving Lu-PSMA-617.

Methods: Of 831 enrolled patients with PSMA-positive progressive mCRPC treated previously with one or more androgen receptor pathway inhibitors and one to two taxanes, 551 were randomised to Lu-PSMA-617 plus protocol-permitted standard of care (SoC).

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Purpose: This study aims to evaluate the prognostic significance of various previously reported PSMA-PET parameters in patients undergoing Lu-PSMA radioligand therapy (RLT). While individual studies have investigated the prognostic value of one or few of these factors, comprehensive analyses are rare.

Methods: Data of 82 patients undergoing Lu-PSMA-radiologand-therapy (RLT) were analyzed.

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Article Synopsis
  • Lutetium 177 (Lu-PSMA-617) is a targeted therapy for metastatic castration-resistant prostate cancer (mCRPC), and baseline Ga-PSMA-11 PET/CT parameters may help determine treatment effectiveness.
  • The analysis used data from the VISION trial, where participants received either Lu-PSMA-617 plus standard care or standard care alone, focusing on how various PET parameters related to treatment outcomes like survival and response rates.
  • Results showed that higher whole-body tumor standardized uptake value (SUV) was linked to better treatment outcomes; for every 1-unit increase in SUV, the risk of radiographic progression and death decreased, indicating Lu-PS
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  • PSMA-PET, introduced in 2012, has significantly improved prostate cancer staging, leading to the development of the PROMISE criteria for standardized imaging reports.
  • This study analyzed data from a large cohort of prostate cancer patients across multiple German hospitals to assess the prognostic value of PROMISE staging in comparison to existing clinical risk assessment models.
  • The findings from 2,414 patients revealed that PPP staging had performance metrics comparable to established clinical risk scores, thus highlighting its potential usefulness in predicting overall survival outcomes.
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Dural arteriovenous fistulas (DAVFs) are rare vascular abnormalities that can present with diverse neurological symptoms. We report a case of a woman in her early 60s who presented with pain in the left ear and dizziness. Neurological evaluation and imaging studies revealed a DAVF in the left cerebellopontine angle.

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Background: [Lu]Lu-PSMA-617 (Lu-PSMA-617) plus protocol-permitted standard of care (SOC) prolonged overall survival (OS) and radiographic progression-free survival (rPFS) versus SOC in patients with prostate-specific membrane antigen (PSMA)-positive metastatic castration-resistant prostate cancer (mCRPC) in the phase 3 VISION study, in addition to beneficial effects on symptomatic skeletal events (SSEs) and health-related quality of life (HRQOL).

Methods: Post hoc analyses used the full analysis set from the VISION study (N = 831) overall and by randomized treatment arm (Lu-PSMA-617 plus SOC, n = 551; SOC, n = 280). Correlations were determined between OS and rPFS and between rPFS or OS and time to SSE or to worsening HRQOL (Functional Assessment of Cancer Therapy-Prostate [FACT-P] and 5-level EQ-5D [EQ-5D-5L]).

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  • This study investigates if a PSMA-PET scan from the skull base to proximal thigh is sufficient for detecting bone metastases in prostate cancer patients.
  • A retrospective analysis of 1050 PET scans revealed significant correlations between PSA levels and the presence of bone metastases, identifying that most metastases occur in patients with higher numbers of total metastases.
  • The study concludes that specific PSA cut-off values (11.15 ng/mL for below the thigh and 12.86 ng/mL for above the skull base) can effectively indicate the presence of bone metastases, showcasing the potential for optimized imaging strategies.
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Prospective results have demonstrated favorable safety and efficacy of [Lu]Lu-PSMA radiopharmaceutical therapy for up to 6 cycles in men with metastatic castration-resistant prostate cancer. However, no systematic data are available outlining the feasibility of extended therapy beyond 6 cycles. We aim to evaluate the safety and efficacy of extended [Lu]Lu-PSMA radiopharmaceutical therapy in patients who have received more than 6 cycles.

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Introduction: We describe the development of a molecular assay from publicly available tumor tissue mRNA databases using machine learning and present preliminary evidence of functionality as a diagnostic and monitoring tool for prostate cancer (PCa) in whole blood.

Materials And Methods: We assessed 1055 PCas (public microarray data sets) to identify putative mRNA biomarkers. Specificity was confirmed against 32 different solid and hematological cancers from The Cancer Genome Atlas (n = 10,990).

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This review paper highlights the transformative role of PSMA-targeted diagnostics and therapy in prostate cancer management, particularly focusing on Lu-PSMA-617, approved by the FDA and EMA for metastatic castration-resistant prostate cancer (mCRPC) patients post-chemotherapy and ARPI treatment. Originating from the VISION trial's success, this paper navigates the current radioligand therapy (RLT) indications, emphasizing practical patient selection, planning, and treatment execution. It critically examines Lu-PSMA's comparative effectiveness against cabazitaxel and Ra-223, addressing decision-making dilemmas for mCRPC treatments.

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Purpose: To evaluate the benefit of a contrast-enhanced computed tomography (CT) radiomics-based model for predicting response and survival in patients with colorectal liver metastases treated with transarterial Yttrium-90 radioembolization (TARE).

Materials And Methods: Fifty-one patients who underwent TARE were included in this single-center retrospective study. Response to treatment was assessed using the Response Evaluation Criteria in Solid Tumors (RECIST 1.

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Article Synopsis
  • A new method was created to accurately measure the most stable form of Technetium ([Tc]Tc) using anion-exchange chromatography combined with inductively coupled plasma-mass spectrometry (ICP-MS) for better detection.
  • Because there are no commercial standards for Technetium, researchers used an innovative approach called isobaric dilution analysis (IBDA) to quantify it by utilizing a Ruthenium spike for comparison.
  • The method was successfully demonstrated by quantifying [Tc]Tc in the raw urine of a patient who had undergone a scan with a Technetium tracer, revealing a concentration of 19.6 ± 0.5 ng L and showcasing the method's potential for analyzing Tc-based radiopharmaceuticals
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Background And Objective: [Lu]Lu-PSMA-617 (Lu-PSMA-617) plus the standard of care (SoC) significantly improved overall survival and radiographic progression-free survival versus SoC alone in patients with prostate-specific membrane antigen (PSMA)-positive metastatic castration-resistant prostate cancer in the VISION trial. We evaluated the safety of additional cycles of Lu-PSMA-617 and the impact of longer observation time for patients receiving Lu-PSMA-617 plus SoC.

Methods: VISION was an international, open-label study.

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[F]tetrafluoroborate ([F]TFB) is an emerging PET tracer with excellent properties for human sodium iodide symporter (NIS)-based imaging in patients with differentiated thyroid cancer (DTC). The aim of this study was to compare [F]TFB PET with high-activity posttherapeutic [I]iodine whole-body scintigraphy and SPECT/CT in recurrent DTC and with [F]FDG PET/CT in suspected dedifferentiation. Twenty-six patients treated with high-activity radioactive [I]iodine therapy (range, 5.

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Purpose: The emergence of chimeric antigen receptor (CAR) T-cell therapy fundamentally changed the management of individuals with relapsed and refractory large B-cell lymphoma (LBCL). However, real-world data have shown divergent outcomes for the approved products. The present study therefore set out to evaluate potential risk factors in a larger cohort.

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In the VISION trial, [Lu]Lu-PSMA-617 (Lu-PSMA-617) plus protocol-permitted standard of care significantly improved overall survival and radiographic progression-free survival compared with standard of care alone in patients with prostate-specific membrane antigen-positive metastatic castration-resistant prostate cancer. This VISION dosimetry substudy quantified absorbed doses of Lu-PSMA-617 in the kidneys and other organs. Participants were a separate cohort of 30 nonrandomized patients receiving standard of care plus Lu-PSMA-617 at 7.

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A 73-year-old man with metastatic pancreatic neuroendocrine tumor was evaluated with 68 Ga-DOTATATE PET/CT for peptide receptor radionuclide therapy. Both PET-positive and negative lesions were seen in the liver, along with extrahepatic metastases. Histopathology was obtained from one of the PET-negative liver lesions to exclude secondary malignancy.

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Ra-dichloride (Ra) and Lu-prostate-specific membrane antigen (PSMA) are approved treatments for metastatic castration-resistant prostate cancer (mCRPC). The safety and effectiveness of sequential use of Ra and Lu-PSMA in patients with mCRPC are not well described. This study aimed to evaluate Lu-PSMA safety and efficacy in patients with mCRPC previously treated with Ra.

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Purpose: Prostate-specific membrane antigen (PSMA) is present in the proximal tubule cells of the kidneys. This results in high renal tracer uptake in PSMA-PET, which may contain useful information on renal function. As part of the evaluation for [Lu]-PSMA therapies, patients undergo PSMA-PET and additional [Tc]-mercapto-acetyltriglycine (MAG3) scintigraphy to assess renal function.

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Background: In VISION, the prostate-specific membrane antigen (PSMA)-targeted radioligand therapy lutetium-177 [Lu]Lu-PSMA-617 (vipivotide tetraxetan) improved radiographic progression-free survival and overall survival when added to protocol-permitted standard of care in patients with metastatic castration-resistant prostate cancer. Here, we report additional health-related quality of life (HRQOL), pain, and symptomatic skeletal event results.

Methods: This multicentre, open-label, randomised, phase 3 trial was conducted at 84 cancer centres in nine countries in North America and Europe.

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