Katherine Y Tossas

Dr. Katherine Y Tossas

orcid

Research Focus & Metrics

Academic Career Length

13Years (2014-Present)

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

Representative Publications

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20 February 2025 in CA: A Cancer Journal for Clinicians
Verified
Journal Article
Open access
ASAnatu H. Saka
Anatu H. Saka
AGAngela N. Giaquinto
Angela N. Giaquinto
LMLauren E. McCullough
Lauren E. McCullough
KTKatherine Y Tossas
Katherine Y Tossas
JSJessica Star
Jessica Star
RSRebecca L. Siegel
Rebecca L. Siegel
African American and other Black individuals (referred to as Black people in this article) have a disproportionate cancer burden, including the lowest survival of any racial or ethnic group for most cancers. Every 3 years, the American Cancer Society estimates the number of new cancer cases and deaths for Black people in the United States and compiles the most recent data on cancer incidence (herein through 2021), mortality (through 2022), survival, screening, and risk factors using population‐based data from the National Cancer Institute and the Centers for Disease Control and Prevention. In 2025, there will be approximately 248,470 new cancer cases and 73,240 cancer deaths among Black people in the United States. Black men have experienced the largest relative decline in cancer mortality from 1991 to 2022 overall (49%) and in almost every 10‐year age group, by as much as 65%–67% in the group aged 40–59 years. This progress largely reflects historical reductions in smoking initiation among Black teens, advances in treatment, and earlier detections for some cancers. Nevertheless, during the most recent 5 years, Black men had 16% higher mortality than White men despite just 4% higher incidence, and Black women had 10% higher mortality than White women despite 9% lower incidence. Larger inequalities for mortality than for incidence reflect two‐fold higher death rates for prostate, uterine corpus, and stomach cancers and for myeloma, and 40%–50% higher rates for colorectal, breast, cervical, and liver cancers. The causes of ongoing disparities are multifactorial, but largely stem from inequalities in the social determinants of health that trace back to structural racism. Increasing diversity in clinical trials, enhancing provider education, and implementing financial incentives to ensure equitable care across the cancer care continuum would help close these gaps.

29 April 2020 in Cancer
Verified
Journal Article
Open access
PDF file
VHVida A. Henderson
Vida A. Henderson
KTKatherine Y Tossas
Katherine Y Tossas
EMErica Martinez
Erica Martinez
BWBarbara Williams
Barbara Williams
PTPaola Torres
Paola Torres
KWKarriem S. Watson
Karriem S. Watson
Background: Trends in breast cancer mortality in the United States are decreasing, but racial disparities persist. Using an implementation science framework to inform evidence‐based breast cancer screening and navigation within federally qualified health centers (FQHCs) with community stakeholders can mitigate barriers to screening.Methods: Using an integrated theoretical framework of the Practical, Robust Implementation and Sustainability Model and the Social Ecological Model, the University of Illinois Cancer Center and Mile Square Health Centers (MSHC) FQHC developed a breast cancer screening and navigation program, known as the Mile Square Accessible Mammogram Outreach and Engagement (Mi‐MAMO) program, to tackle breast cancer disparities in Chicago among underresourced communities. To increase access to screening, patient navigators conducted community outreach activities. Partnerships were forged with community‐based organizations, health care systems, and insurers. Outcomes were monitored with standardized performance measures.Results: Between January and December 2017, 103 women received a screening mammogram at MSHC. To increase screening rates, Mi‐MAMO was started in August 2017. Between January and December 2018, the number of women who received a screening mammogram increased to 567. From August 2017 to December 2018, 779 women received navigation to screening and/or diagnostic services through the Mi‐MAMO program. The majority of women were uninsured (63.9%), and 95.5% were racial/ethnic minorities. Twenty‐four percent (n = 185) completed diagnostic services, and 10 women received positive breast cancer diagnoses (mean age, 49.7 years); all successfully navigated to treatment. The Mi‐MAMO program is ongoing.Conclusions: Deploying an integrated framework for patient navigation programs can increase breast cancer screening utilization and awareness among underresourced populations at higher risk for breast cancer.

7 June 2023 in Cancer Epidemiology, Biomarkers & Prevention
Verified
Journal Article
Closed access
PDF file
KKKarla Kerlikowske
Karla Kerlikowske
MBMichael C. S. Bissell
Michael C. S. Bissell
BSBrian L. Sprague
Brian L. Sprague
JTJeffrey A. Tice
Jeffrey A. Tice
KTKatherine Y Tossas
Katherine Y Tossas
DMDiana L. Miglioretti
Diana L. Miglioretti
Background: Density notification laws require notifying women of dense breasts with dense breast prevalence varying by race/ethnicity. We evaluated whether differences in body mass index (BMI) account for differences in dense breasts prevalence by race/ethnicity. Methods: Prevalence of dense breasts (heterogeneously or extremely dense) according to Breast Imaging Reporting and Data System and obesity (BMI > 30 kg/m2) were estimated from 2,667,207 mammography examinations among 866,033 women in the Breast Cancer Surveillance Consortium (BCSC) from January 2005 through April 2021. Prevalence ratios (PR) for dense breasts relative to overall prevalence by race/ethnicity were estimated by standardizing race/ethnicity prevalence in the BCSC to the 2020 U.S. population, and adjusting for age, menopausal status, and BMI using logistic regression. Results: Dense breasts were most prevalent among Asian women (66.0%) followed by non-Hispanic/Latina (NH) White (45.5%), Hispanic/Latina (45.3%), and NH Black (37.0%) women. Obesity was most prevalent in Black women (58.4%) followed by Hispanic/Latina (39.3%), NH White (30.6%), and Asian (8.5%) women. The adjusted prevalence of dense breasts was 19% higher [PR = 1.19; 95% confidence interval (CI), 1.19–1.20] in Asian women, 8% higher (PR = 1.08; 95% CI, 1.07–1.08) in Black women, the same in Hispanic/Latina women (PR = 1.00; 95% CI, 0.99–1.01), and 4% lower (PR = 0.96; 95% CI, 0.96–0.97) in NH White women relative to the overall prevalence. Conclusions: Clinically important differences in breast density prevalence are present across racial/ethnic groups after accounting for age, menopausal status, and BMI. Impact: If breast density is the sole criterion used to notify women of dense breasts and discuss supplemental screening it may result in implementing inequitable screening strategies across racial/ethnic groups. See related In the Spotlight, p. 1479

26 June 2019 in AIDS Care
Verified
Journal Article
Open access
ALAugust Longino
August Longino
MMMichalina A. Montano
Michalina A. Montano
HSHugo Sanchez
Hugo Sanchez
ABAngela Bayer
Angela Bayer
JSJorge Sanchez
Jorge Sanchez
YMYamilé Molina
Yamilé Molina
In Perú, men who have sex with men (MSM) and transgender women (TW) suffer rates of HIV 50 times greater than the general population. MSM or TW sex workers (SWs) are at especially high risk. Daily oral pre-exposure prophylaxis (PrEP) effectively prevents HIV infection if patients adhere to a daily or on-demand regimen. Necessary levels of adoption and adherence require data-driven intervention strategies for these marginalized groups. We conducted qualitative content analysis of data obtained from focus groups (FGs) with MSM and TW SWs. Both groups expressed strong skepticism about the motives behind international drug trials, and the safety of participating in them. Important differences between MSM and TW groups’ beliefs about trustworthy information as well as community and public institutions also emerged. MSM SWs were less trusting of information from other MSM SWs, and preferred to receive information from institutional medical sources, while TGW SWs preferred to receive information from other TGW SWs. Successful strategies to encourage PrEP uptake and adherence must address the distrust patients feel towards international and institutional actors by providing patients with tailored, reliable information from local and community sources that they trust.

1 May 2019 in American Society of Clinical Oncology Educational Book
Verified
Journal Article
Closed access
LNLailea Noel
Lailea Noel
FPFarya Phillips
Farya Phillips
KTKatherine Y Tossas
Katherine Y Tossas
KSKrista Spear
Krista Spear
NVNathan L. Vanderford
Nathan L. Vanderford
SES. Gail Eckhardt
S. Gail Eckhardt
Current public health problems such as cancer have an expansive set of lifestyle and social circumstances that affect the cause and course of the disease. In response, over the past 7 years, the National Cancer Institute (NCI) has recognized the important role that cancer centers play in their community and has gradually increased the requirements and stringency of these sections in the Cancer Center Support Grant guidelines to include a plan for community outreach and engagement. Developing sustainable community-academic partnerships is an essential factor for the successful dissemination and implementation of promising interventions and programs aimed at decreasing barriers and improving cancer outcomes. Understanding how best to facilitate linkages and collaboration can expedite translation of research knowledge into practice and allow more evidence-based improvements to be implemented into practice as well as influence research agendas. This article will examine several examples of successful community-academic partnerships focused on cancer prevention and control and explore lessons learned.

1 March 2020 in EBioMedicine
Verified
Journal Article
Open access
KTKatherine Y Tossas
Katherine Y Tossas
KWK.S. Watson
K.S. Watson
GCGraham A Colditz
Graham A Colditz
CTC.R. Thomas
C.R. Thomas
JSJ.H. Stewart
J.H. Stewart
RWR.A. Winn
R.A. Winn