Reasons for Discordance between Ga-PSMA-PET and Magnetic Resonance Imaging in Men with Metastatic Prostate Cancer.

Background: PSMA PET has emerged as a "gold standard" imaging modality for assessing prostate cancer metastases. However, it is not universally available, and this limits its impact. In contrast, whole-body MRI is much more widely available but misses more lesions.

68Ga-PSMA-HBED-CC PET/MRI is superior to multiparametric magnetic resonance imaging in men with biochemical recurrent prostate cancer: A prospective single-institutional study.

Background: The primary objective was to compare the overall diagnostic performance, presented as detection rate of Ga-PSMA-HBED-CC positron emission tomography/magnetic resonance imaging (PSMA PET/MRI) versus conventional, multiparametric MRI (mpMRI) in a population of patients with biochemically recurrent prostate cancer. In conjunction with this analysis, secondary objectives included the evaluation of the detection rate stratified by PSA levels and primary treatment modality.

Methods: A total of 165 PSMA PET MRI were performed from April 2018 to May 2021, of whom 108 were presenting for biochemical recurrent disease.

Sequential intensive chemotherapy followed by autologous or allogeneic transplantation for refractory lymphoma.

We evaluate the safety of bendamustine as a bridge to stem cell transplantation (SCT) in patients with relapsed/refractory lymphoma and residual disease after salvage therapy. Thirty-four subjects without complete responses (CR) received bendamustine 200 mg/m/day for 2 days followed 14 days later by SCT. Sixteen subjects in partial remission (PR) with maximal FDG-PET SUVs ≤8 prior to bendamustine received autologous SCT, while 13 with suboptimal responses were allografted.

Phase I trial of docetaxel plus lutetium-177-labeled anti-prostate-specific membrane antigen monoclonal antibody J591 (Lu-J591) for metastatic castration-resistant prostate cancer.

Background: Docetaxel remains a standard of care for metatsatic castration resistant porstate cancer (mCRPC) and has radiosensitizing properties. The dose limiting toxicity (DLT) of radioimmunotherapy is myelosuppression; dose fractionation of Lu-J591 allows similar administered doses with less toxicity. This study (NCT00916123) was designed to determine the safety, DLT, and maximum tolerated dose of fractionated Lu-J591 administered concurrently with standard docetaxel.

Pilot Study of Hyperfractionated Dosing of Lutetium-177-Labeled Antiprostate-Specific Membrane Antigen Monoclonal Antibody J591 ( Lu-J591) for Metastatic Castration-Resistant Prostate Cancer.

Lessons Learned: Hyperfractionation of lutetium-177 ( Lu)-J591 for patients with metastatic castration-resistant prostate cancer did not appear to have any additional advantage over the single dose Lu-J591 or fractionated two-dose Lu-J591 therapy. Definite conclusions were challenging because of the small sample size of this study, and so further studies are needed to evaluate the viability of the hypothesis. On the basis of available data, a registration study of Lu-J591 (also known as TLX591) is planned and will use the two-dose fractionation schedule (Telix Pharma Q3 2019 update https://telixpharma.

Phase 1/2 study of fractionated dose lutetium-177-labeled anti-prostate-specific membrane antigen monoclonal antibody J591 ( Lu-J591) for metastatic castration-resistant prostate cancer.

Background: Prostate cancer is radiosensitive. Prostate-specific membrane antigen (PSMA) is selectively overexpressed on advanced, castration-resistant tumors. Lutetium-177-labeled anti-PSMA monoclonal antibody J591 ( Lu-J591) targets prostate cancer with efficacy and dose-response/toxicity data when delivered as a single dose.

Invasive granulomatous cryptococcal sinusitis in an adult with multiple myeloma.

We report a case of cryptococcal sinusitis, a rare presentation of Cryptococcus neoformans infection in a patient with multiple myeloma. The objective of this case report is to highlight the utility of structural and functional imaging modalities in the differential diagnosis of sinonasal soft tissue masses in the immunocompromised patient population. PET-CT was the first imaging modality in this patient, who presented for routine follow-up staging of multiple myeloma, and was asymptomatic at the time of his presentation.

Radioimmunotherapy of Metastatic Prostate Cancer with ¹⁷⁷Lu-DOTAhuJ591 Anti Prostate Specific Membrane Antigen Specific Monoclonal Antibody.

Prostate specific membrane antigen (PSMA) is the single most well-validated prostate cancer (PCa)-specific cell membrane antigen known. It is present in high levels in 95% of PCa, and is an ideal target to develop radiopharmaceuticals for imaging studies and radionuclide therapy. Humanized J591 monoclonal antibody (mAb) binds specifically with nanomolar affinity to the extracellular domain of PSMA.

Pharmacokinetic assessment of the uptake of 16beta-18F-fluoro-5alpha-dihydrotestosterone (FDHT) in prostate tumors as measured by PET.

Unlabelled: The aim of this study was to develop a clinically applicable noninvasive method to quantify changes in androgen receptor (AR) levels based on (18)F-16beta-fluoro-5alpha-dihydrotestosterone ((18)F-FDHT) PET in prostate cancer patients undergoing therapy.

Methods: Thirteen patients underwent dynamic (18)F-FDHT PET over a selected tumor. Concurrent venous blood samples were acquired for blood metabolite analysis.

The role of PET in lymphoma.

Malignant lymphomas are a heterogeneous group of diseases whose treatment and prognosis depend on accurate staging and evaluation of histologic features. The conventional imaging procedure is CT; however, nuclear medicine imaging has also had a prominent role. Single-photon imaging with 67Ga-citrate has been widely used for lymphomas.

Current status of therapy of solid tumors.

The recent approval of 2 radiolabeled antibodies against cluster designation 20-positive lymphoma has led to a resurgence of interest in radioimmunotherapy. As was the case with chemotherapy development, progress has been most marked in the hematologic neoplasms, both in myeloablative and in nonmyeloablative therapeutic strategies. Success in the radioimmunotherapy of solid tumors has lagged because of the immunogenicity of murine proteins and the relatively slow clearance of humanized intact immunoglobulins.