FWD-1802

This is a Study to Evaluate the Efficacy and Safety of Multiple Combination Therapies with FWD1802 in Subjects with ER-positive/HER2-negative Unresectable Locally Advanced or Metastatic Breast Cancer

This is a phase I open-label dose escalation trial of FWD1802 as monotherapy and in combination with palbociclib in patients with ER+/HER2- unresectable locally advanced or metastatic breast cancer The goal of this clinical trial] is to learn about in ER+/HER2- BC participant population. The main questions it aims to answer are:
* Establish the recommended phase II dose (RP2D) and/or the maximum tolerated dose (MTD) of FWD1802 as monotherapy and in combination with palbociclib in patients with ER+/HER2- unresectable locally advanced or metastatic breast cancer.
* Explore the safety and tolerability of FWD1802 as monotherapy and in combination with Palbociclib.
* Characterise Pharmacokinetics of FWD1802 as monotherapy and in combination with palbociclib.
* Explore preliminary efficacy signals.