Mindfulness Programs for Breast Cancer Survivors

Inclusion Criteria: * The participant or a legally authorized representative must provide study-specific informed consent prior to pre-entry and, for participants treated in the U.S., authorization permitting release of personal health information. * The participant must have been greater than or equal to 18 or less than or equal to 50 years of age at the time of breast cancer diagnosis. * The participant must have a first-time diagnosis of non-metastatic breast cancer which is Stage 0, I, II, or III. * The participant must have a score of greater than or equal to 5 and less than or equal to 14 on the Patient Health Questionnaire-8 item (PHQ-8). * Participants must have completed all primary breast cancer treatments at least 6 months prior to and no more than 5 years prior to registration. Note: Primary treatments include surgery, radiation therapy, adjuvant chemotherapy, targeted therapies (e.g., PARP (poly-ADP ribose polymerase) inhibitors, CDK4/6 inhibitors, TDM-1, pertuzumab, or immunotherapy). (Participants may still be taking adjuvant therapy with trastuzumab or adjuvant endocrine therapy or completing minor reconstructive surgery.) * Participant must be able to understand, speak, read, and write in English or Spanish. * Participant must be willing to participate in a 6-week program to receive training in mindfulness. * Participant must be able to use a smartphone, tablet, or other digital device. * Sex assigned at birth must be female. Exclusion Criteria: * Patient Health Questionnaire-8 item (PHQ-8) score of less than 5 or greater than 14 . * Any history or current evidence of recurrent or metastatic breast cancer. * Current or past history of another cancer. Participants with a history of only non-melanoma skin cancer or in situ cervical cancer without chemotherapy treatment would be eligible. * Currently pregnant or planning to become pregnant in the near future. * Participants who are enrolled in other cancer control or behavioral intervention trials that require frequent assessments or training activities.