To achieve this research goal, we have proposed a 2-group randomized clinical trial among 300 breast cancer survivors who have undergone lumpectomy and/or mastectomy and radiation and/or chemotherapy in the past two years. The MBSR(BC) program will be evaluated against a waitlisted usual care regimen (UC), with patient assessments made at baseline, 6 weeks, and 12 weeks. Patient assessments will provide data on depression, state anxiety, perceived stress, fatigue, pain, sleep, symptom severity, quality of life, mindfulness, fear of recurrence, optimism and social support. Additionally, blood and saliva samples will be collected from participants. Biological stress markers will be measured by blood specimen collection; biological stress markers will include pro-inflammatory and anti-inflammatory cytokines (IL-1β, TNF-α, IL-6, IL-10, IL-1-RA, TNF-RA, IL-8, IFN-gamma), cellular adhesion markers (CD11a, CD54, CD62L, CD45RA, CD45RO) and lymphocyte subsets (CD3, CD19, CD16+56). A stress hormone, cortisol, will be measured by saliva specimen collection. The MBSR(BC) intervention is an adapted 6-week program that follows the curriculum of an 8-week program established by Kabat Zinn and Santorelli. Prior to formal hypothesis testing, the distributions of all explanatory and outcome variables, as well as covariates, will be examined. For outcome variables with skewed distributions, appropriate transformations (e.g. square root, logarithmic, etc.) will be performed to satisfy normality requirements for parametric multivariable linear modeling. This will include choosing the transformation which yields the lowest Anderson-Darling score. In instances in which appropriate transformations cannot be achieved, non-parametric methods will be used.