RecruitingPhase 2Drug trialMDMA-assisted Therapy for Adjustment Disorder (AD) in Dyads of Patients With Cancer and a Concerned Significant OtherThe goal of this clinical trial is to assess feasibility, tolerability and preliminary effectiveness of MDMA-assisted therapy for adjustment disorder (AD) in 10 dyads of patients with cancer and a concerned significant other (CSO) (20 participants total). Participants will undergo an 8-week treatment period which will include two doses of MDMA, two Preparatory Sessions and four Integrative Sessions of non-drug therapy.