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Findings from the REGARDS trial reveal that peripheral blood cytopenias may be associated with a higher risk of cancer-related mortality. This association was particularly strong in Black patients, according to researchers led by Diego Adrianzen Herrera, MD, who presented the findings during the 2021 ASH Annual Meeting.
The trial analyzed cancer mortality and cytopenia incidence in 30,239 U.S. individuals who were followed with a semiannual phone follow-up period through 2018.
The hazard of cytopenia-related cancer mortality was calculated in three hazard models: Model 1 adjusted for demographics, Model 2 adjusted for Model 1 plus risk factors for cancer/anemia, and Model 3 adjusted for Model 1 plus socioeconomic factors. Additionally, the researchers assessed differences in the association of cytopenia and cancer death by race.
Of the 19,028 participants who were evaluable for the analysis, 60% were White and 62% were female. There were 1,112 cancer deaths and 3,725 deaths from other causes during the median follow-up period of nine years. Approximately 2% (n = 383) of participants had cytopenia, including 65% (n = 25) of White patients and 35% (n = 113) of Black patients. The prevalence of cytopenia increased by advancing age and was highest in males (56%).
In all multivariate models, cytopenia was significantly associated with increased risk of cancer mortality, including in models adjusted for demographics (hazard ratio [HR] = 1.60), cancer risk factors (HR = 1.67), and socioeconomic variables (HR = 1.58). Additionally, both anemia and macrocytosis were associated with the risk of cancer-related death in all three hazard models.
The 10-year cumulative incidence of cancer-related death was significantly greater in patients with than without baseline cytopenia (13% vs. 6.5%, respectively; p &lt; 0.01). In the analysis of race by cytopenia interaction, the HR for cancer mortality was significantly higher in Black patients compared with White patients in Model 1 (2.01 vs. 1.41, respectively; p = 0.016), Model 2 (2.12 vs. 1.45; p = 0.009), and Model 3 (1.82 vs. 1.44; p = 0.04).
Anemia and macrocytosis were the only individual hematologic parameters associated with higher HR for cancer in Black versus White patients across all risk models. According to the authors, these findings could inform future research to clarify racial disparities in cancer mortality.

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Findings from the REGARDS trial reveal that peripheral blood cytopenias may be associated with a higher risk of cancer-related mortality. This association was particularly ...

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