The purpose of this study is to train Nigerian radiologists to perform ultrasound-guided breast biopsies. Researchers will use mHealth devices to create a sustainable and practical way of training radiologists in Nigeria to perform and clinically implement US-guided breast biopsies into their practice.

Inclusion Criteria:

• Age 18 and older female.
• Breast ultrasound demonstrating a solid mass that is suspicious for cancer, which would typically undergo either a blind biopsy or surgical excision at the Nigerian hospital where the patient is seeking diagnosis.

Exclusion Criteria:

• Participants unwilling to sign consent.
• Participants under the age of 18.

Participants will be accrued in medical clinics as determined by the local investigators and local research staff. Informed consent forms approved by each local IRB will be obtained by research staff from each site.

Memorial Sloan Kettering Cancer Center supports the international committee of medical journal editors (ICMJE) and the ethical obligation of responsible sharing of data from clinical trials. The protocol summary, a statistical summary, and informed consent form will be made available on clinicaltrials.gov when required as a condition of Federal awards, other agreements supporting the research and/or as otherwise required. Requests for deidentified individual participant data can be made beginning 12 months after publication and for up to 36 months post publication. Deidentified individual participant data reported in the manuscript will be shared under the terms of a Data Use Agreement and may only be used for approved proposals. Requests may be made to: crdatashare@mskcc.org.