Enrollment in clinical trials usually favors a particular demographic group. But there is limited research available to explain what study attributes affect the completion of these specific demographic groups.

This trial will evaluate the safety and efficacy of metastatic breast cancer treatments. The focus will be on tracking the rates of completion and withdrawal among these individuals.

It will also try to analyze data from the perspective of different demographic groups to check for recurring trends which might yield insights for the sake of future metastatic breast cancer studies.

Inclusion Criteria:

• Patient is at least 18 years of age
• Patient is able and willing to comply with the treatment/follow-up schedule and requirements
• Patient must provide written informed consent

Exclusion Criteria:

• Women who are pregnant, intend to become pregnant, or are lactating
• Inability to perform regular electronic reporting
• Participants who are vulnerable to any intervention

Patients who are actively considering involvement in an observational metastatic breast cancer clinical trial, but have not yet completed enrollment and registration.