Bovine papillomavirus prostate cancer antigen virus-like particle vaccines are efficacious in advanced cancers in the TRAMP mouse spontaneous prostate cancer model

AbstractProstate cancer is a candidate for immunotherapy because cancer cells express tissue-specific proteins that can be therapeutic targets. However, immune checkpoint inhibitors and active immunization have performed poorly in clinical trials. We developed a novel virus-like particle (VLP) vaccine composed of bovine papillomavirus L1 protein engineered to display surface docking sites. We decorated VLPs with peptides encoding T cell epitopes from two prostate cancer-associated tumor antigens, prostate stem cell antigen (PSCA), and prostatic acid phosphatase (PAP-1 and PAP-2), and a neo-antigen, stimulator of prostatic adenocarcinoma-specific T cells (SPAS-1). The VLP vaccines induced a mean frequency of antigen-specific IFN- γ secreting CD8 + T cells of 2.9% to PSCA, 9.5% to SPAS-1, 0.03% to PAP-1, and 0.03% to PAP-2 in tumor-bearing TRAMP mice. We treated TRAMP mice at 19–20 weeks of age, when mice have advanced stages of carcinogenesis, with either VLP vaccine, anti-PD1 antibody, or combination immunotherapy. The VLP vaccine alone or in combination with anti-PD1 antibody significantly reduced tumor burden, while anti-PD1 antibody had a modest non-significant therapeutic effect. All treatments significantly increased CD3 + and CD8 + T cell infiltration into tumor tissue compared to control mice, a nd combination therapy resulted in significantly greater CD3 + and CD8 + T cell infiltrat...
Source: Cancer Immunology, Immunotherapy - Category: Cancer & Oncology Source Type: research

Related Links:

Conditions:   Biochemically Recurrent Prostate Carcinoma;   Prostate Adenocarcinoma Interventions:   Biological: Durvalumab;   Drug: Olaparib;   Other: Quality-of-Life Assessment;   Other: Questionnaire Administration Sponsors:   University of Washington;   National Cancer Institute (NCI);   AstraZeneca Not yet recruiting
Source: - Category: Research Source Type: clinical trials
We report about the rare occurrence of symptomatic testicular metastasis of an acinar adenocarcinoma of the prostate. Testicular metastases are usually incidentally detected in patients treated with bilateral orchiectomy or more often during autopsy. In the literature, there are only a few clinical cases describing symptomatic testicular metastases. However, the possibility of such metastases should be considered in patients diagnosed with advanced prostate cancer. Testicular examination should be performed regularly, even in patients with low prostate-specific antigen levels. PMID: 32248276 [PubMed - as supplied by publisher]
Source: Der Urologe. Ausg. A - Category: Urology & Nephrology Authors: Tags: Urologe A Source Type: research
Conditions:   Prostate Adenocarcinoma;   Obesity, Morbid Interventions:   Device: Bead Block 300-500 um;   Behavioral: Weight Management;   Drug: Lupron Sponsors:   Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins;   Maryland Cigarette Restitution Fund Not yet recruiting
Source: - Category: Research Source Type: clinical trials
Conclusion: This study has shown that simplification of ISH protocols by the use of COPs provides equivalent results to the use of LNA methods and it can be used to precisely identify cells in which miRNAs are expressed. PMID: 32223721 [PubMed - as supplied by publisher]
Source: British Journal of Biomedical Science - Category: Laboratory Medicine Tags: Br J Biomed Sci Source Type: research
Transient acantholytic dermatosis (TAD) is a relatively common entity that has been also noted to occur in patients with cancer. Herein, we describe a case of transient acantholytic dermatosis occurring in a patient with a history of prostate cancer status post radiation, now being treated with combination therapy with pembrolizumab and carboplatin-pemetrexed for advanced lung adenocarcinoma. Our case emphasizes the importance of being cognizant of TAD and its associations, particularly in cancer patients.
Source: Dermatology Online Journal - Category: Dermatology Source Type: research
Purpose: To perform a multi-institutional analysis of patients with synchronous prostate and rectosigmoid cancers.Materials and Methods: A retrospective review of Duke University and Durham Veterans Affairs Medical Center records was performed for men with both prostate and rectosigmoid adenocarcinomas from 1988 to 2017. Synchronous presentation was defined as symptoms, diagnosis, or treatment of both cancers within 12 months of each other. The primary study endpoint was overall survival. Univariate and multivariable Cox regression was performed.Results: Among 31,883 men with prostate cancer, 330 (1%) also had rectosigmoid...
Source: Frontiers in Oncology - Category: Cancer & Oncology Source Type: research
MONDAY, March 23, 2020 -- For men with intermediate- and high-risk prostate adenocarcinoma, 10-year outcomes are similar with conventionally fractionated intensity-modulated radiation therapy (C-IMRT) or moderate hypofractionated IMRT (H-IMRT),...
Source: - Pharma News - Category: Pharmaceuticals Source Type: news
Contributors : Ivana Hermanova ; Patricia Z úñiga-García ; Sonia Fernandez-Ruiz ; Arkaitz Carracedo ; Cristian Suárez-Cabrera ; Iris Lodewijk ; Jesús M ParamioSeries Type : Expression profiling by arrayOrganism : Mus musculusIn order to identify the contribution of Lkb1 loss to Pten driven prostate cancer progression, we engineered a prostate conditional mutant mice in which was induced the loss of Lkb1 in combination with heterozygous loss of the prostate tumor suppressor Pten (Ptenpc+/- Lkb1pc-/-). This mouse model developed metastatic prostate squamous cell carcinoma. We compared this ...
Source: GEO: Gene Expression Omnibus - Category: Genetics & Stem Cells Tags: Expression profiling by array Mus musculus Source Type: research
CONCLUSIONS: Our results highlight that ADT with or without Cy/GVAX induces a complex immune response within the prostate tumor microenvironment. These data have important implications for combining ADT with immunotherapy. In particular, our finding that ADT increases both CD8+ T cells and Tregs, supports the development of regimens combining ADT with Treg-depleting agents in the treatment of prostate cancer. PMID: 32173650 [PubMed - as supplied by publisher]
Source: Clinical Cancer Research - Category: Cancer & Oncology Authors: Tags: Clin Cancer Res Source Type: research
We report a case of a 59-year-old man with prostate adenocarcinoma, Gleason score 9 after prostatectomy and adjuvant radiotherapy. The patient showed biochemical recurrence. On standard 68Ga-PSMA PET/CT examination, 60 minutes postinjection, the PET/CT images showed only trace accumulation in the ureters. To identify lesions close to the ureters, imaging of the pelvis was performed 2 hours postinjection. The delayed image showed clearly visible increased uptake in a right internal iliac lymph node that was normal-sized by CT. The patient underwent radiotherapy with planning based on the 68Ga-PSMA PET/CT image. Follow-up te...
Source: Clinical Nuclear Medicine - Category: Nuclear Medicine Tags: Interesting Images Source Type: research
More News: Adenocarcinoma | Allergy & Immunology | Cancer | Cancer & Oncology | Cancer Vaccines | Clinical Trials | Immunotherapy | Prostate Cancer | Stem Cell Therapy | Stem Cells | Vaccines | Veterinary Vaccinations