Efficacy of Daromun Neoadjuvant Intratumoral Treatment in Clinical Stage IIIB/C/D Melanoma Patients

Inclusion criteria

1. Histologically or cytologically confirmed diagnosis of clinical stage IIIB, IIIC, and IIID (AJCC 8th edition) locoregional melanoma that is eligible for complete surgical resection of all metastases (surgically resectable). 2. Eligible subjects must have measurable disease and must be candidate for intralesional therapy with at least one injectable cutaneous, subcutaneous, or nodal melanoma lesion (≥ 10 mm in longest diameter) or with multiple injectable lesions that in aggregate have a longest diameter of ≥ 10 mm. 3. Prior anti-tumor treatment for the primary melanoma lesion, including surgery and approved adjuvant treatments (e.g., radiotherapy, immune checkpoint inhibitors, BRAF/MEK inhibitors, etc.) is allowed. Before enrollment in the study, a wash-out period of 6 weeks is required and toxicities from prior treatments should be resumed to Grade ≤1. 4. Males or females, age ≥ 18 years. 5. ECOG Performance Status/WHO Performance Status ≤ 1. 6. Life expectancy of \> 24 months. 7. Absolute neutrophil count \> 1.5 x 109/L. 8. Hemoglobin \> 9.0 g/dL. 9. Platelets \> 100 x 109/L. 10. Total bilirubin ≤ 30 μmol/L (or ≤ 2.0 mg/dl). 11. ALT and AST ≤ 2.5 x the upper limit of normal (ULN). 12. Serum creatinine \< 1.5 x ULN. 13. LDH serum level ≤ 1.5 x ULN. 14. Documented negative test for HIV, HBV and HCV. For HBV serology, the determination of HBsAg and anti-HBcAg Ab is required. In patients with serology documenting previous exposure to HBV (i.e. positive anti-HBsAg with not vaccination and/or positive anti-HBcAg Ab), negative serum HBV-DNA is also required. 15. All acute toxic effects (excluding alopecia) of any prior therapy must have resolved to National Cancer Institute (NCI) Common Terminology Criteria for Adverse Events (CTCAE) (v4.03) Grade ≤ 1 unless otherwise specified above. 16. All women of childbearing potential (WOCBP) must have negative pregnancy test results at the screening. WOCBP must be using, from the screening to three months following the last study drug administration, highly effective contraception methods. WOCBP and effective contraception methods are defined by the "Recommendations for contraception and pregnancy testing in clinical trials" issued by the Head of Medicine Agencies' Clinical Trial Facilitation Group and which include, for instance, progesterone-only or combined (estrogen- and progesterone-containing) hormonal contraception associated with inhibition of ovulation, intrauterine devices, intrauterine hormone-releasing systems, bilateral tubal occlusion, vasectomized partner or sexual abstinence. Pregnancy test will be repeated at the safety visit (only WOCBP and only for patients in Arm 1). 17. Male patients with WOCBP partners must agree to use simultaneously two acceptable methods of contraception (i.e. spermicidal gel plus condom) from the screening to three months following the last study drug administration. 18. Evidence of a personally signed and dated informed consent document indicating that the subject has been informed of all pertinent aspects of the study. 19. Willingness and ability to comply with the scheduled visits, treatment plan, laboratory tests and other study procedures.