Overview Oral Tamoxifen vs. TamGel vs. Control in Women With Atypical Hyperplasia or Lobular Carcinoma In Situ Status: Recruiting Trial end date: 2026-12-31 Target enrollment: Participant gender: Summary The investigators plan to prospectively study breast tissue changes after a short course of Tamoxifen (Tam). Phase: Phase 2/Phase 3 Details Lead Sponsor: Amy C. DegnimTreatments: AfimoxifeneHydroxytamoxifenTamoxifen