HBI-8000-303: A Multicenter, Randomized, Double-Blind Phase 3 Study of HBI-8000 Combined with Nivolumab versus Placebo with Nivolumab in Patients with Unresectable or Metastatic Melanoma Not Previously Treated with PD-1 or PD-L1 Inhibitors

  • sponsor
    HUYABIO International, LLC.
Updated on 26 August 2022


This is a phase 3 study to compare the efficacy and safety of HBI-8000 or Placebo combined with nivolumab on patients with unresectable or metastatic melanoma and eligible patients who are not adolescents or patients with new, progressive brain metastasis will be stratified by PD-L1 expression and LDH level.


This is a multicenter, randomized, double-blind, placebo-controlled Phase 3 study of HBI-8000 or Placebo combined with nivolumab. Randomization of eligible patients will be stratified by PD-L1 expression (positive, ≥1% expression level versus negative, <1% expression level) and LDH (normal versus elevated) in the main study. Adults with new, progressive brain metastasis, or adolescents with or without new progressive brain metastasis will be enrolled in a separate, non-randomized, open-label cohort to receive the combination of HBI-8000 and nivolumab.

Condition Brain Metastases, Metastatic Melanoma
Clinical Study IdentifierTX306103
SponsorHUYABIO International, LLC.
Last Modified on26 August 2022


Yes No Not Sure

Inclusion Criteria

Histopathologically confirmed diagnosis of non-uveal, Stage III (unresectable), or Stage IV (metastatic) melanoma according to AJCC staging system (8th edition)
Known BRAF V600 mutation status or consent to BRAF V600 mutation testing before randomization
Tumor tissue available for PD-L1 testing at central lab. PD-L1 expression level is required for randomization. In order to be randomized, a patient must be classified as PD-L1 positive or PD-L1 negative according to the following criteria
PD-L1 positive (≥ 1% tumor cell membrane staining in a minimum of a hundred evaluable tumor cells) vs
PD-L1 negative (< 1% tumor cell membrane staining in a minimum of a hundred evaluable tumor cells)
Note: If an insufficient amount of tumor tissue from an unresectable or metastatic site is available prior to the start of the Screening Phase, patients must consent to allow the acquisition of additional tumor tissue for assessment of the biomarker
Males or females 12 years of age or older
ECOG performance status ≤1 for age ≥18 years, Lansky performance score ≥80% for age 12 to 17 years
At least one measurable lesion defined by RECIST 1.1 criteria, (separate from the lesion to be used for tumor tissue collection for PD-L1 testing) not counting brain metastasis with
Longest diameter ≥10 mm by CT (when slice thickness is ≤5 mm); or ≥ 2× slice thickness (when slice thickness is >5 mm)
Pathologically enlarged lymph node: ≥15 mm in short axis by CT (when slice thickness is ≤5 mm)
Clinical: ≥10 mm (that can be accurately measured with calipers)
Have not received anti-PD-1, anti-PD-L1 or other systemic therapy for unresectable or metastatic melanoma, except for the following, provided that the patient has recovered from all treatment-related toxicities
BRAF mutation targeting therapy > 4 weeks before administration of Study Treatment
Adjuvant or neoadjuvant therapy with PD-1 or PD-L1 inhibitors or anti-CTLA-4) is allowed if disease progression/or recurrence occurred at least 6 months after the last dose and no clinically significant immune related toxicities leading to treatment discontinuation were observed
Adjuvant interferon therapy must have been completed > 6 weeks before administration of Study Treatment
Any prior radiotherapy or minor surgery must be completed at least 2 weeks and 1 week respectively before Day 1 dosing and recovered from all treatment related toxicities
Screening laboratory results within 14 days prior to randomization
Hematology: WBC ≥3000/μL, neutrophils ≥1500/μL, platelets ≥100 × 103/μL, hemoglobin ≥10.0 g/dL independent of transfusion. The use of erythropoietic growth factor to achieve hemoglobin (Hgb) ≥ 10 g/dl is acceptable
The CrCL≥ 30 mL/min using Cockcroft-Gault formula
AST and ALT ≤3 × ULN, alkaline phosphatase ≤2.5 × ULN unless bone metastases present (patients with documented bone metastases: alkaline phosphatase <5 x ULN), bilirubin ≤ 1.5 × ULN (unless known Gilbert's disease where it must be ≤ 3 × ULN), serum albumin ≥ 3.0 g/dL)
Negative serum pregnancy test at baseline for women of childbearing potential
Females of childbearing potential (non-surgically sterile or premenopausal female capable of becoming pregnant) and all males (due to potential risk of drug exposure through the ejaculate) must agree to use adequate birth control measures from study start, during the study and for 5 months after the last dose of Study Drug. Acceptable methods of birth control in this trial include two highly effective methods of birth control (as determined by the Investigator; one of the methods must be a barrier technique) or abstinence
Have the ability to understand and the willingness to sign a written informed consent document, comply with study scheduled treatment, visits and assessments

Exclusion Criteria

History of ≥ Grade 3 hypersensitivity reactions to monoclonal antibodies
Previous treatment with a PD-1, PD-L1, PD-L2, CTLA-4 inhibitor, or any other agents targeting T-cell co-stimulation or immune checkpoint pathways for unresectable or metastatic melanoma
History of a cardiovascular illness including: congestive heart failure (New York Heart Association Grade III or IV); unstable angina or myocardial infarction within the previous 6 months; or symptomatic cardiac arrhythmia despite medical management. QT interval corrected by heart rate using QTcF >450 ms in males or >470 ms in females, or congenital long QT syndrome
Uncontrolled hypertension, systolic blood pressure (SBP) >160 mmHg or diastolic blood pressure (DBP) >100 mmHg
Patients with new, active, or progressive brain metastases or leptomeningeal disease with except when considered for a separate special open-label cohort described in protocol Section 5.3 or "Inclusion of Patients with Progressive Brain Metastasis" section in the protocol synopsis
History of hemorrhagic diarrhea, inflammatory bowel disease, active uncontrolled peptic ulcer, or bowel resection that affects absorption of orally administered drugs
Active, known, or suspected autoimmune disease, except for Type I diabetes mellitus, hypothyroidism requiring only hormone replacement, or skin disorders (such as vitiligo, psoriasis, or alopecia) not requiring systemic therapy
Active uncontrolled bacterial, viral, or fungal infection requiring systemic therapy
Known history of testing positive for HIV, known AIDS
Hepatitis B surface antigen positive or hepatitis C antibody positive. Further investigation per institutional practices may be performed to exclude active infection
Patients with a condition requiring chronic systemic treatment with either corticosteroids (>10 mg daily prednisone or equivalents) or other immunosuppressive medications within 14 days before administration of Study Treatment. Inhaled or topical steroids, or adrenal replacement dose of corticosteroids at dose ≤ 10 mg/day prednisone equivalent are permitted
Use of another investigational agent (drug or vaccine not marketed for any indication) 28 days or before administration of Study Treatment. If the investigational agent is a monoclonal antibody, then within 3 months before administration of Study Treatment
Pregnant or breast-feeding women
Second malignancy unless in remission for 2 years or locally curable cancers that have been treated with curative intent with no evidence of recurrence, such as
Basal or squamous cell skin cancer
Superficial bladder cancer
Carcinoma in situ of cervix or breast
Incidental prostate cancer
Non melanomatous skin cancer
Carcinoma in situ of the cervix treated with curative intent
Prostate cancer treated with curative intent with serum prostate specific antigen (PSA) < 2.0 ng/mL
Patients with medical conditions requiring administration of strong cytochrome P450 (CYP), CYP3A4 Inducers and Inhibitors
Uncontrolled adrenal insufficiency or active chronic liver disease
Has received approved live vaccine/live attenuated vaccines within 30 days of planned Cycle 1 Day 1. Inactivated viral vaccines or vaccines based upon subviral component are allowed; however intranasal influenza vaccines (e.g. Flu-Mist) are not allowed. COVID-19 vaccination should be administered at least 7 days before Cycle 1 Day 1
Underlying medical conditions that, in the Investigator's opinion, will make the administration of Study Treatment hazardous or obscure the interpretation of toxicity determination or AEs
Unwilling or unable to comply with procedures required in this protocol
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