Clark Clark

Dr. Clark Clark


Research Focus & Metrics

Academic Career Length

6Years (2021-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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27 August 2022 in Cancers
Verified
Journal Article
Open access
PDF file
RCRoderick Keir Clark
Roderick Keir Clark
DVDanny Vesprini
Danny Vesprini
Steven NarodSteven Narod
Steven Narod
It is not clear to what extent the age of diagnosis and the attained age impact on cancer mortality rates in men with newly diagnosed prostate cancer. We estimated annual prostate cancer mortality rates and 20-year survival rates according to the age of diagnosis, race, grade and time since diagnosis using data from the Surveillance, Epidemiology and End-Results (SEER) program. We identified 116,796 prostate cancer patients diagnosed between 1992 and 1997 and followed them for 20 years. There were 21,896 deaths from prostate cancer. We calculated actuarial survival rates and annual prostate cancer mortality rates by age of diagnosis and by tumor grade. The risk of a man dying of prostate cancer was 17% for men diagnosed before age 70 and was 21% for those diagnosed after age 70. The mean annual prostate cancer mortality rate calculated over the 20-year period post-diagnosis was 1.5%. The annual rate increased from 0.9% for those diagnosed below age 60 to 2.1% for those diagnosed above age 70. For men with Gleason score ≥ 7 prostate cancer, the annual prostate cancer mortality rate peaked 2–3 years after diagnosis and then declined. For men diagnosed with Gleason score ≤ 6 prostate cancer, the annual prostate cancer mortality rate continued to rise 20 years after diagnosis and peaked after age 85. This suggests that high-grade prostate cancers are aggressive from the outset, but that low-grade prostate cancers may enter a state of dormancy and reactivate as the patient ages.

30 November 2022 in JAMA Network Open
Verified
Journal Article
Open access
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VJViranda H. Jayalath
Viranda H. Jayalath
RCRoderick Keir Clark
Roderick Keir Clark
KLKatherine Lajkosz
Katherine Lajkosz
RFRouhi Fazelzad
Rouhi Fazelzad
NFNeil E. Fleshner
Neil E. Fleshner
RHRobert J. Hamilton
Robert J. Hamilton
Importance: Epidemiological evidence supports a role for statins in improving survival in advanced prostate cancer, particularly among men receiving androgen-ablative therapies.Objective: To study the association between statin use and survival among men with prostate cancer receiving androgen deprivation therapy (ADT) or androgen receptor axis–targeted therapies (ARATs).Data Sources: This systemic review and meta-analysis used sources from MEDLINE, EMBASE, Epub Ahead of Print, Cochrane Clinical Trials, Cochrane Systematic Reviews, and Web of Science from inception to September 6, 2022.Study Selection: Observational studies reporting associations of concurrent statin use and survival outcomes (in hazard ratios [HRs]).Data Extraction and Synthesis: Two authors independently abstracted all data. Summary estimates pooled multivariable HRs with 95% CIs using the generic inverse variance method with random-effects modeling. A priori specified subgroup and sensitivity analyses were undertaken, and heterogeneity, study quality, and publication bias were evaluated. Confidence in the evidence was assessed using the GRADE (Grading of Recommendations Assessment, Development, and Evaluation) approach.Main Outcomes and Measures: Overall mortality and prostate cancer–specific mortality (PCSM).Results: Twenty-five cohorts of 119 878 men (65 488 statin users [55%]) with more than 74 416 deaths were included. Concurrent statin use was associated with a 27% reduction in the risk of overall mortality (HR, 0.73 [95% CI, 0.66-0.82]; I2 = 83%) and a 35% reduction in the risk of PCSM (HR, 0.65 [95% CI, 0.58-0.73]; I2 = 74%), with substantial heterogeneity in both estimates. Subgroup analyses identified a PCSM advantage associated with statins for men receiving ARATs compared with ADT alone (HR, 0.40 [95% CI, 0.30-0.55] vs 0.68 [95% CI, 0.60-0.76]; P = .002 for difference). Confidence in the evidence was rated low for both outcomes.Conclusions and Relevance: The findings of this meta-analysis show that concurrent statin use was associated with reduced overall mortality and PCSM among men receiving androgen-ablative therapies for advanced prostate cancer. These findings are limited by the observational nature of the data and residual unexplained interstudy heterogeneity. Randomized clinical trials are warranted to validate these results.

22 June 2022 in npj Precision Oncology
Verified
Journal Article
Open access
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AFAmy Finch
Amy Finch
RCRoderick Keir Clark
Roderick Keir Clark
DVDanny Vesprini
Danny Vesprini
JLJustin Lorentz
Justin Lorentz
RKRaymond H. Kim
Raymond H. Kim
Steven NarodSteven Narod
Steven Narod
Most criteria for genetic testing for prostate cancer susceptibility require a prior diagnosis of prostate cancer, in particular cases with metastatic disease are selected. Advances in the field are expected to improve outcomes through tailored treatments for men with advanced prostate cancer with germline pathogenic variants, although these are not currently offered in the curative setting. A better understanding of the value of genetic testing for prostate cancer susceptibility in screening, for early detection and prevention is necessary. We review and summarize the literature describing germline pathogenic variants in genes associated with increased prostate cancer risk and aggressivity. Important questions include: what is our ability to screen for and prevent prostate cancer in a man with a germline pathogenic variant and how does knowledge of a germline pathogenic variant influence treatment of men with nonmetastatic disease, with hormone-resistant disease and with metastatic disease? The frequency of germline pathogenic variants in prostate cancer is well described, according to personal and family history of cancer and by stage and grade of disease. The role of these genes in aggressive prostate cancer is also discussed. It is timely to consider whether or not genetic testing should be offered to all men with prostate cancer. The goals of testing are to facilitate screening for early cancers in unaffected high-risk men and to prevent advanced disease in men with cancer.

16 February 2022 in Cancers
Verified
Journal Article
Open access
PDF file
RCRoderick Keir Clark
Roderick Keir Clark
JHJaime Herrera-Caceres
Jaime Herrera-Caceres
MKMiran Kenk
Miran Kenk
NFNeil Fleshner
Neil Fleshner
Background: Prostate cancer is a leading cause of death. Approximately one in eight men who are diagnosed with prostate cancer will die of it. Since there is a large difference in mortality between low- and high-risk prostate cancers, it is critical to identify individuals who are at high-risk for disease progression and death. Germline genetic differences are increasingly recognized as contributing to risk of lethal prostate cancer. The objective of this paper is to review prostate cancer management options for men with high-risk germline mutations. Methods: We performed a review of the literature to identify articles regarding management of prostate cancer in individuals with high-risk germline genetic mutations. Results: We identified numerous publications regarding the management of prostate cancer among high-risk germline carriers, but the overall quality of the evidence is low. Conclusions: We performed a review of the literature and compiled clinical considerations for the management of individuals with high-risk germline mutations when they develop prostate cancer. The quality of the evidence is low, and there is an immediate need for further research and the development of consensus guidelines to guide clinical practice for these individuals.

11 February 2023 in Annals of Surgical Oncology
Verified
Journal Article
Closed access
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KAKhatereh Aminoltejari
Khatereh Aminoltejari
AHAmanda E. Hird
Amanda E. Hird
ZKZachary Klaassen
Zachary Klaassen
RSRaj Satkunasivam
Raj Satkunasivam
GKGirish S. Kulkarni
Girish S. Kulkarni
RCRoderick Keir Clark
Roderick Keir Clark

1 May 2021 in European Urology Focus
Verified
Journal Article
Closed access
RCRoderick Keir Clark
Roderick Keir Clark
KMKristen McAlpine
Kristen McAlpine
NFNeil Fleshner
Neil Fleshner