The phase Ⅰ open-label study (NCT03471663) evaluated the safety, tolerability, pharmacokinetics (PK) and efficacy of D-0502 as monotherapy and in combination with palbociclib in female patients with ER+ and HER2- breast cancer. D-0502 monotherapy showed promising antitumor activity and tolerable toxicity in female patients with ER+ and HER2- locally advanced or metastatic BC. Currently this treatment is being evaluated in a phase Ⅲ study for patients with ER+ and HER2- locally advanced or metastatic BC in China.
Fulvestrant is currently the only approved agent in its class and is limited by poor oral bioavailability necessitating monthly intramuscular injections...In Stage 1, D-0502 was evaluated with palbociclib at a dose below the MTD first before escalating to the MTD... A first-in-human phase 1 study of D-0502 has been initiated in women with advanced or metastatic HR-positive and HER2-negative breast cancer. D-0502 has been well tolerated and achieved significant exposure and preliminary clinical activity in patients. Further results will be presented at the meeting.