PGR and breast cancer: Among patients with breast cancer, risk factors for VTE at baseline were age ≥ 65 years, ECOG PS of 2, a history of VTE, and D-dimer > 1.2 μg/mL, and these risk factors were similar to those reported previously in other populations of patients with breast cancer (i.e., older age, high BMI, pre-existing VTE, comorbid disease, cancer subtype, tumor size and metastasis, PgR-negative status, and treatment with chemotherapy and hormone therapy) [11, 27].