This is a single-arm, open-label, investigator-initiated clinical study (IIT) designed to evaluate the preliminary efficacy, safety, tolerability, immunogenicity, and pharmacokinetic (PK) characteristics of WTX212A Injection in patients with advanced solid tumors.

This is a single-arm, open-label, investigator-initiated clinical study (IIT) designed to evaluate the preliminary efficacy, safety, tolerability, immunogenicity, and pharmacokinetic (PK) characteristics of WTX212A Injection in patients with advanced solid tumors. The study is divided into two phases: an initial exploratory phase and an expansion phase. The study includes two cohorts: Cohort A (WTX212A monotherapy) and Cohort B (WTX212A in combination with radiotherapy)

Inclusion Criteria:

1. Voluntarily signed informed consent, understanding of the study, and willingness and ability to complete all study procedures.
2. Male or female, aged 18 to 75 years (inclusive).
3. Patients with histologically and/or cytologically confirmed advanced malignant tumors.

Exclusion Criteria:

1. Suffering from other serious internal diseases, including but not limited to: uncontrolled diabetes, active peptic ulcer, liver cirrhosis, active bleeding, etc., those with uncontrollable or severe cardiovascular diseases, such as NYHA Class II or higher congestive heart failure, unstable angina, myocardial infarction, etc., within 6 months before the first dose, difficult to control hypertension (systolic blood pressure ≥180mmHg and/or diastolic blood pressure ≥100mmHg).
2. Uncontrollable pleural effusion, peritoneal effusion, or pericardial effusion requiring puncture and drainage, or recurrence requiring re-drainage after puncture and drainage.
3. History of pulmonary fibrosis, interstitial pneumonia, pneumoconiosis, radiation pneumonitis, drug-related pneumonia, or severe lung function impairment.
4. Previous IO drug treatment with adverse events related to the drug that required permanent discontinuation of IO treatment.

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