Frequency and factors associated with delay in breast cancer treatment in Brazil, according to data from the Oncology Panel, 2019-2020.

Objective: to analyze treatment delay and the flow of care for women with breast cancer in Brazil in 2019 and 2020.

Method: this was a follow-up study of breast cancer cases available from the Oncology Panel; a chi-square test and multilevel logistic regression were performed in order to analyze the explanatory variables associated with delay (greater than 60 days) in starting treatment.

Results: 22,956 cases (54.