Incidence, treatment patterns, and mortality for patients with breast cancer during the first year of the COVID-19 pandemic: a population-based study.

Purpose: The COVID-19 pandemic created significant disruptions in the diagnosis and treatment of breast cancer (BC). Several public health measures were taken with limited evidence on their potential impact. In this observational study, we sought to compare the incidence of BC, treatment patterns, and mortality during 2020 versus 2018 and 2019.

Associations of radiotherapy receipt with lung cancer risk by histological subtype among breast cancer survivors in the United States.

Radiotherapy for breast cancer has been associated with an increased risk of secondary malignancies, including primary lung cancer. Whether this association varies by histological subtype of lung cancer remains unknown. Based on the data from 12 Surveillance, Epidemiology, and End Results registries, we examined the association between radiotherapy receipt and the risk of subtype-specific subsequent primary lung cancer (SPLC) among female first primary breast cancer cases diagnosed between ages 20 and 84 from 1992 to 2020.

Cell Populations in Human Breast Cancers are Molecularly and Biologically Distinct with Age.

Aging is associated with increased breast cancer risk and outcomes are worse for the oldest and youngest patients, regardless of subtype. It is not known how cells in the breast tumor microenvironment are impacted by age and how they might contribute to age-related disease pathology. Here, we discover age-associated differences in cell states and interactions in human estrogen receptor-positive (ER+) and triple-negative breast cancers (TNBC) using new computational analyses of existing single-cell gene expression data.

Contribution of health insurance to racial and ethnic disparities in advanced stage diagnosis of 10 cancers.

For many cancer sites, it is unclear to what extent differences in health insurance coverage contribute to racial and ethnic disparities in stage III-IV diagnoses. Using the National Cancer Database (1,893,026 patients aged 18-64 years, diagnosed between 2013-2019), we investigated a potential mediating role of health insurance (privately insured vs uninsured) in explaining racial and ethnic disparities in stage at diagnosis of 10 cancers (ie, breast, prostate, colorectal, lung, cervical, uterine, bladder, head and neck, skin melanoma), detectable early through screening, physical examination, or clinical symptoms. The analyses provided evidence of mediation of non-Hispanic Black vs White disparities in eight cancers (range of proportions mediated: 4.

Regional Variation in Deescalated Therapy in Older Adults With Early-Stage Breast Cancer.

Importance: Although trial data support the omission of axillary surgery and radiation therapy (RT) in women aged 70 years or older with T1N0 hormone receptor-positive (HR+) breast cancer, potential overtreatment in older adults with frailty persists.

Objective: To determine how much geospatial variation in locoregional therapy may be attributed to region vs patient factors.

Design, Setting, And Participants: This retrospective cross-sectional study included women aged 70 years or older who were diagnosed with HR+/ERBB2-negative (ERBB2-) breast cancer from January 1, 2013, to December 31, 2017.