Inclusion Criteria:
* 1\. Patients with unresectable stage III or IV malignant tumors confirmed by pathology and/or cytology; such as malignant melanoma, head and neck tumors, soft tissue sarcoma, liver tumors (primary hepatocellular carcinoma or liver metastases), biliary tract tumors, pancreatic cancer, esophageal cancer, gastric cancer, etc.
* 2\. Lack of standard effective treatment options, or failure of or relapse after standard treatments.
* 3.Male or female patients aged 18-75 years (inclusive); Eastern Cooperative Oncology Group (ECOG) performance status score of 0-1; expected survival of more than 3 months.
* 4\. At least 4 weeks have elapsed since completion of prior antitumor therapies (including endocrine therapy, chemotherapy/radiotherapy, and targeted therapy) (except radiotherapy for bone metastases); for patients treated with nitrosoureas or mitomycin, at least 6 weeks since discontinuation; and recovery from prior treatment-related adverse effects to Grade 1 or lower.
* 5\. Patients who have undergone major surgery must be at least 4 weeks post-operation.
* 6\. According to RECIST 1.1 criteria, at least one measurable target lesion is required, with a lesion suitable for intratumoral injection. A measurable tumor lesion is defined as having a longest diameter ≥10 mm with a scan slice thickness ≤5.0 mm; for lymph node lesions, a short-axis diameter ≥15 mm.
* 7\. No severe dysfunction of major organs.
* 8\. Laboratory tests:
1. White Blood Cell (WBC) ≥3.0×10⁹/L, Absolute Neutrophil Count (ANC) ≥2.0×10⁹/L, Hemoglobin (Hb) ≥90 g/L; Platelet (PLT) ≥100×10⁹/L; absolute lymphocyte count (ALC)≥0.8×10⁹/L;
2. Blood urea nitrogen (BUN) and serum creatinine ≤1.5× the upper limit of normal (ULN);
3. Total bilirubin (TBIL) ≤1.5× ULN (for patients with hepatic involvement, TBIL ≤3× ULN);
4. Alanine Aminotransferase (ALT) and Aspartate Aminotransferase (AST) ≤2.5× ULN; for patients with liver metastases, ≤5× ULN;
5. Normal coagulation function (Prothrombin Time, APTT, and Thrombin Time ≤1.5× ULN).
* 9\. Female subjects and their partners must use effective contraception during treatment and for 3 months after treatment.
* 10\. Subjects with genital herpes must have completed herpes resolution for at least 3 months.
* 11\. Voluntary signing of the informed consent form, with expected good compliance.
Exclusion Criteria:
* 1\. Concomitant serious medical diseases, including uncontrolled diabetes, severe infections, or active gastrointestinal ulcers.
* 2\. Presence of clinically significant cardiovascular or cerebrovascular disease, including:
1. Severe or uncontrolled heart disease requiring treatment, congestive heart failure classified as New York Heart Association (NYHA) class III or IV, unstable angina not controlled by medication, a history of myocardial infarction within the past 6 months, Corrected QT Interval (QTc) on Electrocardiogram (ECG) ≥450 ms in males or ≥470 ms in females, or severe arrhythmias requiring drug treatment (excluding atrial fibrillation or paroxysmal supraventricular tachycardia);
2. Placement of a cardiac stent within the past 6 months;
3. Inadequately controlled hypertension, defined as systolic blood pressure ≥160 mmHg and/or diastolic blood pressure ≥100 mmHg.
* 3.Uncontrolled primary brain tumors or brain metastases.
* 4\. Bone metastases (except for bone metastases that are stable and controlled after treatment), or the presence of active, clinically symptomatic brain metastases.
* 5\. Active autoimmune diseases requiring systemic treatment within the past 2 years (including but not limited to rheumatoid arthritis, systemic lupus erythematosus, Sjögren's syndrome, etc., such as the use of disease-modifying drugs, corticosteroids, or immunosuppressive drugs). Replacement therapy (e.g., thyroxine, insulin, or physiological corticosteroid replacement therapy for renal or pituitary insufficiency) is not considered a systemic treatment.
* 6\. History of immunodeficiency (HIV antibody-positive), or other acquired or congenital immunodeficiency diseases, or a history of organ transplantation.
* 7\. Uncontrolled psychiatric disorders or infectious diseases. Lesions that do not meet the volume requirements for intratumoral injection.
* 8\. Patients with active hepatitis B or hepatitis C infection: those who are HBsAg-positive or HBcAb-positive with detectable HBV DNA copies (lower limit of quantification: 500 IU/mL); HBV DNA testing is mandatory at screening for such patients. Patients with a positive anti-HCV antibody test are eligible only if HCV RNA PCR testing is negative.
* 9\. Positive HIV test result.
* 10\. Presence of active tuberculosis infection or other infectious diseases requiring systemic treatment.
* 11\. Large amounts of pleural effusion or ascites accompanied by clinical symptoms or requiring symptomatic treatment.
* 12\. Pregnant or breastfeeding women.
* 13\. Use of, or ongoing treatment with, other investigational drugs or antiviral therapies within 4 weeks prior to treatment, except that patients with chronic hepatitis B receiving continuous treatment may use entecavir, tenofovir disoproxil fumarate, or adefovir dipivoxil.
* 14\. Participation in another clinical study within the past 4 weeks.
* 15\. Known allergy to herpes viruses or any components of the study drug.
* 16\. Any other condition that, in the investigator's judgment, makes the patient unsuitable for participation in this trial.
