RecruitingPhase 2Drug trialSystemic Therapy of Open-label Prophylactic Pravastatin or Pentoxifylline/Tocopherol Prevention of Lymphedema Advancing to Eventual Fibrosis: an Interventional Registry-embedded Bayesian Randomized Trial for Radiation Sequelae (STOP4-LATE-FIBROSE)To learn if pentoxifylline and vitamin E or pravastatin can reduce radiation-induced lymphedema/fibrosis.