A Phase 2, Open-Label Study to Evaluate the Safety and Effects of HLX-1502 in Patients With Neurofibromatosis Type 1

Exclusion criteria

• . Prior treatment with HLX-1502 for a PN.
• . The participant has used any of the following systemic medications/ therapies within the specified period prior to enrollment: MEK-inhibitors, other drugs in the TKI class, HLX-1502, Participants may have received treatment for a PN or other tumor/malignancy but must have fully recovered to baseline or CTCAE ≤ Grade 1 from acute toxicities from prior therapies except alopecia, Myelosuppressive chemotherapy, Hematopoietic growth factors, Biologic (anti-neoplastic agent), Investigational Drugs, Any other systemically administered anti-neoplastic agent and Radiation therapy.
• . Evidence of an NF1-related tumor such as optic pathway or other low-grade glioma, high-grade glioma, malignant peripheral nerve sheath tumor, or other cancer/tumor requiring treatment with chemotherapy, biologic therapy, surgery or radiation therapy.
• . Participants with high-grade glioma, malignant peripheral nerve sheath tumor, or other malignancy who received treatment in the last 12 months. Exceptions include basal cell carcinoma of the skin and squamous cell carcinoma of the skin that have undergone potentially curative therapy. If the investigator has any clinical concerns for ANNUBP/Atypical Neurofibroma or MPNST, a biopsy sample must be taken prior to study confirming eligibility.
• . Dental braces or prosthesis that interfere with volumetric analysis of the neurofibroma(s).
• . Surgery: Any major surgery within 12 weeks before starting the Treatment Period or foreseen during participation in the trial, any minor surgeries within 1 month before first dose of study treatment and Participants must have complete wound healing from major surgery or minor surgery before the first dose of study treatment. Participants with clinically relevant ongoing complications from prior surgery are not eligible.
• . Cataracts noted on ophthalmologic exam.
• . Cardiovascular disorders.