Inclusion Criteria:  History of non-metastatic, localized, or regional solid or blood malignancy(ies) Completion of primary cancer treatment (i.e., radiation, surgery, chemotherapy) and/or current use of long-term maintenance hormonal or biologic therapy Age ≥18 years Elevated fear of recurrence (FCRI severity score ≥16) MGB/BIDMC Medical Record Number (MRN)  Exclusion Criteria:  Self-reported inability to speak and write in English Undertreated serious mental illness as defined by history of suicidality, psychosis, and/or psychiatric hospitalization in the past year Inability to access technology and/or sufficient internet to participate virtual groups sessions