A Study of MHB036C Combined With MHB039A in Patients With Advanced Breast Cancer or Other Advanced Malignant Solid Tumors

This study is testing a new combination of two investigational drugs — MHB036C and MHB039A — in people with advanced breast cancer or other advanced solid tumors. **You may be eligible if...** - You are between 18 and 75 years old - You have a confirmed diagnosis of a locally advanced or metastatic solid tumor - Your cancer can be measured on imaging scans - Your overall health and organ function are adequate (ECOG score 0–1) - Your life expectancy is at least 3 months - You are willing to use reliable contraception during and for 12 weeks after treatment **You may NOT be eligible if...** - You have had two or more different primary cancers in the past 5 years - You have brain metastases that are not stable - You have received prior treatments that overlap with this study's drugs - You have significant heart, liver, kidney, or lung problems - You are pregnant or breastfeeding Talk to your doctor to see if this trial is right for you.