This study aims to develop and prospectively validate a questionnaire to select patients with breast cancer who need to access to hospital for clinical visit during treatment with CDK4/6i, to improve patients' quality of life and reduce burden of hospital accesses.
Written informed consent.
Age ≥18 years old
Histologically or cytologically documented diagnosis of HR+, HER2-negative breast cancer based on local laboratory results and who are not amenable to resection or radiation therapy with curative intent. HR+ tumor is defined as ER and/or PgR expression in greater than 1% of tumor cells. HER2-negative breast cancer is defined as a negative in situ hybridization test or an immunohistochemistry (IHC) status of 0 or 1+. If IHC is 2+, a negative in situ hybridization (FISH, CISH, or SISH) test is required to confirm the HER2-negative status (based on the most recently analyzed tissue sample tested by a local laboratory).
Currently on treatment and have received ≥ 2 months of CDK4/6i + hormone therapy as their initial endocrine based treatment for their metastatic disease in concordance with local CDK4/6i label or treatment guideline.
History of significant neurological or psychiatric disorders that would prohibit the understanding and giving of informed consent.
Patient has a concurrent invasive malignancy and /or is concurrently using other anti-neoplastic therapy.