RecruitingPhase 2Drug trialAvelumab or Hydroxychloroquine With or Without Palbociclib to Eliminate Dormant Breast CancerThis clinical trial will assess the safety and early efficacy of Hydroxychloroquine or Avelumab, with or without Palbociclib, in early-stage ER+ breast cancer patients who are found to harbor disseminated tumor cells (DTCs) in the bone marrow after definitive surgery and standard adjuvant therapy.