Doreen Ezeife

Dr. Doreen Ezeife

Tom Baker Cancer Center, Calgary, AB, Canada

Research Focus & Metrics

Academic Career Length

8Years (2019-Present)

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

Representative Publications

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26 July 2022 in Therapeutic Advances in Medical Oncology
Verified
Journal Article
Open access
DEDoreen Ezeife
Doreen Ezeife
ESEldon Spackman
Eldon Spackman
RJRosalyn A. Juergens
Rosalyn A. Juergens
JLJanessa J. Laskin
Janessa J. Laskin
JAJason S. Agulnik
Jason S. Agulnik
NLNatasha B. Leighl
Natasha B. Leighl
Background: Liquid biopsy (LB) can detect actionable genomic alterations in plasma circulating tumor circulating tumor DNA beyond tissue testing (TT) alone in advanced non-small cell lung cancer (NSCLC) patients. We estimated the cost-effectiveness of adding LB to TT in the Canadian healthcare system. Methods: A cost-effectiveness analysis was conducted using a decision analytic Markov model from the Canadian public payer (Ontario) perspective and a 2-year time horizon in patients with treatment-naïve stage IV non-squamous NSCLC and ⩽10 pack-year smoking history. LB was performed using the comprehensive genomic profiling Guardant360™ assay. Standard of care TT for each participating institution was performed. Costs and outcomes of molecular testing by LB + TT were compared to TT alone. Transition probabilities were calculated from the VALUE trial (NCT03576937). Sensitivity analyses were undertaken to assess uncertainty in the model. Results: Use of LB + TT identified actionable alterations in more patients, 68.5 versus 52.7% with TT alone. Use of the LB + TT strategy resulted in an incremental cost savings of $3065 CAD per patient (95% CI, 2195–3945) and a gain in quality-adjusted life-years of 0.02 (95% CI, 0.01–0.02) versus TT alone. More patients received chemo-immunotherapy based on TT with higher overall costs, whereas more patients received targeted therapy based on LB + TT with net cost savings. Major drivers of cost-effectiveness were drug acquisition costs and prevalence of actionable alterations. Conclusion: The addition of LB to TT as initial molecular testing of clinically selected patients with advanced NSCLC did not increase system costs and led to more patients receiving appropriate targeted therapy.

24 October 2022 in Canadian Medical Association Journal
Verified
Journal Article
Open access
PDF file
DEDoreen Ezeife
Doreen Ezeife
GPGreg Padmore
Greg Padmore
MVMarcus Vaska
Marcus Vaska
TTTony H. Truong
Tony H. Truong
On July 26, 1990, the U.S. Congress enacted the Americans with Disabilities Act (ADA), which was intended as a broad, national, civil rights-oriented mandate "for the elimination of discrimination against individuals with disabilities," both physical and mental. ADA protection is extended, in limited form, to those with addiction disorders. However, many addicted individuals are denied ADA protection because of exclusionary criteria in the ADA itself and because of increasingly restrictive interpretations of the ADA in recent cases. The benefit to the addicted persons, and to the larger society, is lost when unfair discriminatory practices preclude employment of otherwise qualified, though stigmatized, individuals. The ADA currently falls short, in many respects, of preventing such discrimination against those with addictions.

20 December 2019 in Cancer
Verified
Journal Article
Closed access
PDF file
DEDoreen Ezeife
Doreen Ezeife
FDFrancois Dionne
Francois Dionne
AFAline Fusco Fares
Aline Fusco Fares
ECEllen Laura Rose Cusano
Ellen Laura Rose Cusano
RFRouhi Fazelzad
Rouhi Fazelzad
NLNatasha B. Leighl
Natasha B. Leighl

18 August 2023 in Current Oncology
Verified
Journal Article
Open access
PDF file
MHMarya Hussain
Marya Hussain
CWChelsea A Wong
Chelsea A Wong
ETEddy Taguedong
Eddy Taguedong
SVSaurav Verma
Saurav Verma
MMMD Mahsin
MD Mahsin
DEDoreen Ezeife
Doreen Ezeife
New oncology drugs undergo detailed review prior to public funding in a single-payer healthcare system. The aim of this study was to assess how cancer drug review times impact funding recommendations. Drugs reviewed by the pan-Canadian Oncology Drug Review (pCODR) between the years 2012 and 2020 were included. Data were collected including Health Canada approval dates, initial and final funding recommendations, treatment intent, drug class, clinical indications, and incremental cost-effectiveness ratios (ICER). Univariable and multivariable analyses were used to determine the association between funding recommendations and review times. Of the 164 applications submitted, 130 received a positive final recommendation. Median time from Health Canada (HC) approval to final recommendation was longer for drugs indicated for the treatment of gastrointestinal (GI) and lung cancer compared to breast, genitourinary (GU), and other tumours (205 vs. 198 vs. 111 vs. 129 vs. 181 days, respectively; Kruskal–Wallis p = 0.0312). Drugs with longer review times were more likely to receive a negative pCODR recommendation, even when adjusting for tumour type, drug class, and intent of therapy (157 vs. 298 days; Wilcoxon p = 0.0003, OR 1.002 95% CI [1.000–1.004].). There was no association between funding recommendation and tumour type or class of drug. The exploration of factors associated with variance in review times will be important in ensuring timely patient access to cancer drugs.

21 November 2021 in Current Oncology
Verified
Journal Article
Open access
PDF file
ECEllen Cusano
Ellen Cusano
CWChelsea A Wong
Chelsea A Wong
ETEddy Taguedong
Eddy Taguedong
MVMarcus Vaska
Marcus Vaska
TATasnima Abedin
Tasnima Abedin
DEDoreen Ezeife
Doreen Ezeife
In the era of rapid development of new, expensive cancer therapies, value frameworks have been developed to quantify clinical benefit (CB). We assessed the evolution of CB since the 2015 introduction of The American Society of Clinical Oncology and The European Society of Medical Oncology value frameworks. Randomized clinical trials (RCTs) assessing systemic therapies for solid malignancies from 2010 to 2020 were evaluated and CB (Δ) in 2010–2014 (pre-value frameworks (PRE)) were compared to 2015–2020 (POST) for overall survival (OS), progression-free survival (PFS), response rate (RR), and quality of life (QoL). In the 485 studies analyzed (12% PRE and 88% POST), the most common primary endpoint was PFS (49%), followed by OS (20%), RR (12%), and QoL (6%), with a significant increase in OS and decrease in RR as primary endpoints in the POST era (p = 0.011). Multivariable analyses revealed significant improvement in ΔOS POST (OR 2.86, 95% CI 0.46 to 5.26, p = 0.02) while controlling for other variables. After the development of value frameworks, median ΔOS improved minimally. The impact of value frameworks has yet to be fully realized in RCTs. Efforts to include endpoints shown to impact value, such as QoL, into clinical trials are warranted.

31 May 2022 in Current Oncology
Verified
Journal Article
Open access
PDF file
DEDoreen Ezeife
Doreen Ezeife
OAOlexiy I. Aseyev
Olexiy I. Aseyev
Sharlene GillSharlene Gill
Sharlene Gill
SWStephen Welch
Stephen Welch
BCBruce Colwell
Bruce Colwell
DHDesiree Hao
Desiree Hao
On behalf of the Canadian Association of Medical Oncologists, we are pleased to present the abstracts of the 2022 Annual Meeting. The CAMO Virtual Annual Scientific Meeting (ASM) took place on 28 April 2022. Twenty-five (25) abstracts were selected for presentation as oral presentations and poster presentations. Awards for the top three (3) abstracts were presented during the ASM. All of them are marked as “Award Recipient”. We congratulate all the presenters on their research work and contribution.