A Phase I/II Study to Evaluate the Safety, Tolerability, and Efficacy of HSK42360-Na Tablets Combined With Cetuximab With or Without Chemotherapy in Patients With BRAF V600-Mutant Metastatic Colorectal Cancer
This is a Phase I/II, single-arm, open-label, multi-center study to evaluate the safety, tolerability, pharmacokinetics, and preliminary efficacy of HSK42360-Na tablets combined with cetuximab with or without chemotherapy in patients with BRAF V600-mutant metastatic colorectal cancer (mCRC). The Phase I stage uses a 3+3 dose escalation design to determine the maximum tolerated dose (MTD) and recommended Phase II dose (RP2D) of HSK42360-Na in combination with cetuximab. The Phase II stage evaluates the efficacy and safety of HSK42360-Na combined with cetuximab alone or with mFOLFOX6/FOLFIRI chemotherapy in expansion cohorts.
• Age ≥18 years; voluntarily participate in this clinical trial, understand the study procedures, and have signed the informed consent form;
• ECOG performance status 0-1;
• Estimated survival time \>3 months;
• Histologically or cytologically confirmed metastatic and unresectable colorectal adenocarcinoma. For Phase I, Phase II Cohort 1, and the safety lead-in period of Cohorts 2/3: previously received one or more systemic treatments for metastatic colorectal cancer, and failed standard treatment, or have no standard treatment option, or standard treatment is not applicable at this stage; for the subsequent expansion phase of Phase II Cohorts 2/3: no prior systemic treatment for metastatic colorectal cancer;
• Genetic testing documentation (limited to PCR or NGS-based assays) must be provided prior to enrollment to demonstrate BRAF V600 mutation positivity;
• Agree to provide tumor tissue and/or blood samples;
• At least one measurable lesion according to RECIST 1.1 criteria;
• Laboratory values meeting the following standards:
• Absolute neutrophil count (ANC) ≥1.5×10⁹/L; platelets (PLT) ≥100×10⁹/L; hemoglobin (HB) ≥90 g/L (no transfusion or growth factor support within 7 days prior to testing); Total serum bilirubin ≤1.5×ULN; AST and/or ALT ≤2.0×ULN; if liver metastases are present, or if Gilbert syndrome (unconjugated hyperbilirubinemia) is clearly documented, AST and/or ALT ≤3.0×ULN, total bilirubin ≤1.5×ULN; Serum creatinine (Scr) ≤1.5×ULN, or creatinine clearance ≥50 mL/min (measured or calculated using the Cockcroft-Gault equation); Coagulation: International normalized ratio (INR) and activated partial thromboplastin time (APTT) ≤1.5×ULN;
• Men and women of childbearing potential must agree to use appropriate contraceptive methods (hormonal, barrier method, or abstinence) during the study and for 3 months after the last dose; women of childbearing potential must have a negative pregnancy test within 7 days prior to dosing; male participants must not donate sperm from the start of treatment until 90 days after stopping treatment;
⁃ Fully understand this clinical trial and voluntarily sign the written informed consent form.