Publications by authors named "Anssi Petas"

Importance: Prostate-specific antigen (PSA) screening has potential to reduce prostate cancer mortality but frequently detects prostate cancer that is not clinically important.

Objective: To describe rates of low-grade (grade group 1) and high-grade (grade groups 2-5) prostate cancer identified among men invited to participate in a prostate cancer screening protocol consisting of a PSA test, a 4-kallikrein panel, and a magnetic resonance imaging (MRI) scan.

Design, Setting, And Participants: The ProScreen trial is a clinical trial conducted in Helsinki and Tampere, Finland, that randomized 61 193 men aged 50 through 63 years who were free of prostate cancer in a 1:3 ratio to either be invited or not be invited to undergo screening for prostate cancer between February 2018 and July 2020.

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Purpose: To compare infectious complications after transrectal systematic prostate biopsy (SB) and magnetic resonance imaging (MRI)-targeted biopsy (TB) in a large retrospective cohort to assess whether one technique is superior to the other regarding infectious complications.

Methods: A total of 4497 patients underwent 5288 biopsies, 2875 (54%) SB and 2413 (46%) MRI-TB only. On average, 12 SB cores and 3.

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Objectives: To evaluate the feasibility of a population-based screening trial using prostate-specific antigen (PSA), a kallikrein panel and multiparametric magnetic resonance imaging (MRI) aimed at minimizing overdiagnosis, while retaining mortality benefit.

Patients And Methods: Feasibility of the screening algorithm was evaluated in terms of participation, screening test results and cancer detection. A random sample of 400 men aged 65 years was identified from the population registry and invited for screening with three stepwise tests (PSA, kallikrein panel and MRI).

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Background: To determine the added value of preoperative prostate multiparametric MRI (mpMRI) supplementary to clinical variables and their role in predicting post prostatectomy adverse findings and biochemically recurrent cancer (BCR).

Methods: All consecutive patients treated at HUS Helsinki University Hospital with robot assisted radical prostatectomy (RALP) between 2014 and 2015 were included in the analysis. The mpMRI data, clinical variables, histopathological characteristics, and follow-up information were collected.

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Background: Conventional systematic prostate biopsies (SBx) have multiple limitations, and magnetic resonance imaging (MRI)-ultrasound fusion targeting is increasingly applied (fusion biopsies [FBx]). In our previous studies, we have shown that loss of the tumor suppressor gene phosphatase and tensin homolog (PTEN) in radical prostatectomy (RP) specimens predicts poor disease-specific survival, and in active surveillance (AS), PTEN loss in SBx predicts an adverse AS outcome, although SBx PTEN status does not correlate well with the corresponding RP status. Here, we have hypothesized that PTEN and erythroblast transformation-specific related gene (ERG) status in FBx correlate better with RP than they would in SBx.

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Background: Diagnosing clinically significant prostate cancer (PCa) is challenging, but may be facilitated by biomarkers and multiparametric magnetic resonance imaging (MRI).

Objective: To determine the association between biomarkers phosphatase and tensin homolog (PTEN) and ETS-related gene (ERG) with visible and invisible PCa lesions in MRI, and to predict biochemical recurrence (BCR) and non-organ-confined (non-OC) PCa by integrating clinical, MRI, and biomarker-related data.

Design, Setting, And Participants: A retrospective analysis of a population-based cohort of men with PCa, who underwent preoperative MRI followed by radical prostatectomy (RP) during 2014-2015 in Helsinki University Hospital (n = 346), was conducted.

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To analyse the impact noise generated by prostate biopsy devices. In a laboratory setting, repeated impact noise was recorded at distances of 50 cm and 100 cm using five brands of device on chicken meat, an apple and an empty target. In a clinical setting, the impact noise levels of prostate biopsy devices were recorded in 40 real patient cases using three brands of device.

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Background: It remains unclear whether patients with positive surgical margins or extracapsular extension benefit from adjuvant radiotherapy following radical prostatectomy.

Objective: To compare the effectiveness and tolerability of adjuvant radiotherapy following radical prostatectomy.

Design, Setting, And Participants: This was a randomised, open-label, parallel-group trial.

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Robotic-assisted laparoscopic radical prostatectomy (RALP) has become the most widespread treatment for organ-confined prostate cancer. Here, we describe a fast specimen retrieval technique for RALP to obtain high-quality tissue specimen with minimal warm ischemia time for next-generation biobanking. Here, we show that using fast retrieval technique, short warm ischemia times can be achieved while not increasing the surgical time.

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Objective The aim of this study was to analyze the impact of introduction of robot-assisted prostate surgery and its quality measures in Finland from 2008 to 2012. Materials and methods Registry data were collected for time trends and national distribution of prostate cancer surgery in Finland, while preoperative, operative and follow-up data were collected for quality measures. Results The number and proportion of robot-assisted laparoscopic radical prostatectomies (RALPs) increased rapidly and they accounted for 68% of all radical prostatectomies in 2012.

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Objective: The aim of this study was to investigate the performance of transrectal biopsies in predicting pathological outcomes after radical prostatectomy (RP) and in estimating possible candidates for focal therapies.

Material And Methods: The study was a retrospective analysis of 96 prostate cancer patients treated by robot-assisted laparoscopic RP at Helsinki University Central Hospital in 2009-2010. Data from diagnostic biopsies were compared with data from reassessment of RP slides.

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Objective: The aims of this study were to analyse the efficacy and safety of orally administered dabigatran in prostate cancer patients who have undergone robotic assisted laparoscopic prostatectomy (RALP) and to analyse the effects of RALP on selected markers of coagulation activity.

Material And Methods: Data were collected prospectively on the first 400 patients who underwent RALP at Helsinki University Central Hospital between 2009 and 2011. As thromboprophylaxis, intermittent compression devices were used in association with anaesthesia.

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Most benign prostatic hyperplasia (BPH) patients can be diagnosed and treated in primary care. Evaluation requires a medical history and a symptom score (DAN-PSS or IPSS) and a careful physical examination including a digital rectal examination. Careful follow-up and medical therapy are the usual first-line management options in uncomplicated BPH.

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Robotic laparoscopic radical prostatectomy is an established method in the treatment of localized prostatic cancer. The equipment comprises a separate control console that makes ergonomic working possible. The optics creates a three-dimensional view and 10 to 15-fold magnification, thus enabling accurate operation.

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Background: Here we evaluate the effects of oral phytoestrogen supplementation on hypothalamic-pituitary-testicular (HPT) axis in CaP patients.

Methods: We recruited 40 men about to undergo radical prostatectomy for CaP to receive either 240 mg of clover phytoestrogens or placebo daily for 2 weeks. Serum hormone levels were measured before and after treatment.

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Objectives: (1) To determine the duration of androgen deprivation after a single buserelin implant 9.45 mg in the neoadjuvant setting in combination with curative radiation therapy of carcinoma of the prostate, and (2) to evaluate the time to recovery of gonadal function, and the incidence and duration of hypogonadal symptoms.

Methods: We prospectively evaluated 21 men with carcinoma of the prostate who received one implant of 9.

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Background: Phytoestrogens have been suggested to reduce the risk of prostate cancer (CaP), but no data exists on how oral phytoestrogen supplementation influences phytoestrogen concentrations in prostate tissue.

Methods: Forty men with CaP, assigned for radical prostatectomy, received 240 mg of clover phytoestrogens or placebo daily for a 2-week period before their operation in a prospective and randomized study. Phytoestrogens were measured in plasma and prostate tissue by time-resolved fluoroimmunoassay (TR-FIA).

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Objectives: To determine whether short-term treatment of patients about to undergo transurethral resection of the prostate (TURP) with tranexamic acid (TXA) would be beneficial in reducing the associated blood loss.

Methods: A prospective and randomized trial was conducted with 136 men requiring TURP for obstructive urinary symptoms. The treatment group received 2 g TXA three times daily on the day of, and first day after, the operation.

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