Pucotenlimab Combined With Becotatug Vedotin in Advanced Cutaneous Squamous Cell Carcinoma

Inclusion Criteria: 1. Voluntarily sign the informed consent form and agree to comply with the protocol requirements. 2. Age ≥18 years and ≤80 years on the day of signing the informed consent form, regardless of gender. 3. Life expectancy ≥12 weeks. 4. Histopathologically confirmed cutaneous squamous cell carcinoma (cSCC), which is either locally advanced and inoperable (including recurrence after ≥2 prior surgeries, or deemed unresectable by a surgeon, or where surgery may lead to severe complications or deformity) or metastatic. 5. Have received 0-1 prior lines of systemic chemotherapy for advanced cSCC, and have experienced disease progression during or after the most recent treatment (relapse within 6 months after completing adjuvant therapy is considered as one line of therapy). 6. Able to provide tumor tissue specimens (paraffin blocks, paraffin-embedded sections, or fresh tissue sections) from a primary or metastatic site for pathological testing. The most recent archived tumor tissue specimen should be used. If archived tissue is unavailable, a new biopsy must be performed. 7. Have at least one measurable lesion at baseline according to RECIST 1.1 criteria (the longest diameter ≥10 mm on CT scan, or short axis ≥15 mm for lymph nodes; measurable lesions should not have been irradiated, unless progression has been demonstrated within a prior radiation field or after local therapy). Digital photography may be used for superficial lesions. 8. Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1 within 7 days prior to treatment initiation. 9. No severe cardiac dysfunction, with left ventricular ejection fraction (LVEF) ≥50% within 28 days prior to treatment initiation. 10. Adequate organ function within 7 days prior to treatment initiation, defined as: (1)Bone Marrow Function: Absolute neutrophil count (ANC) ≥1.5×10⁹/L, platelet count ≥100×10⁹/L, hemoglobin ≥90 g/L; and no transfusion or blood product administration within 14 days prior to the first dose, and no treatment with biologic response modifiers (e.g., G-CSF, erythropoietin) within 7 days prior to the first dose. (2)Liver Function: For patients without liver metastases: total bilirubin (TBIL) ≤1.5 × upper limit of normal (ULN); alanine aminotransferase (ALT) and aspartate aminotransferase (AST) ≤2.5 × ULN. For patients with liver metastases: TBIL ≤1.5 × ULN, ALT and AST ≤5 × ULN. (3)Renal Function: Serum creatinine (Cr) ≤1.5 × ULN, or creatinine clearance (Ccr) ≥50 mL/min (calculated using the Cockcroft-Gault formula) (4)Coagulation Function: International normalized ratio (INR) ≤1.5 × ULN and activated partial thromboplastin time (APTT) ≤1.5 × ULN (unless the patient is receiving therapeutic anticoagulation). 11.Men and women of childbearing potential must agree to use effective contraception from the time of signing the informed consent form until 6 months after the last dose of the investigational product. Women of childbearing potential include premenopausal women and women within 2 years of menopause. A negative serum pregnancy test result is required for women of childbearing potential within ≤7 days before the first dose of the investigational product. Exclusion Criteria: 1. History of other malignancies within the past five years, except for cured cervical carcinoma in situ, thyroid cancer, or cutaneous basal cell carcinoma. 2. Prior receipt of any of the following treatments: 1. Any prior therapy targeting anti-PD-1, anti-PD-L1, PD-L2, CD137, CTLA-4 antibodies, or any other antibodies/drugs specifically targeting T-cell costimulation or immune checkpoint pathways; 2. Any prior EGFR monoclonal antibody therapy; 3. Investigational drug administration within 28 days before the first dose; 4. Anticancer chemotherapy within 21 days before the first dose (washout period ≥14 days for oral fluoropyrimidines, leucovorin, or weekly paclitaxel chemotherapy; ≥42 days for nitrosoureas or mitomycin); 5. Radiotherapy within 28 days before the first dose, or palliative radiotherapy for bone metastases within 2 weeks; 6. Major surgery within 28 days before the first dose without full recovery, or planned major surgery within the first 12 weeks after receiving the study drug. 3. Symptomatic brain or leptomeningeal metastases (unless treated \>6 months prior, with negative imaging within 4 weeks before enrollment, and stable neurological status without steroid therapy). 4. Any severe or uncontrolled systemic disease per investigator's judgment, including poorly controlled hypertension (systolic BP \>160 mmHg or diastolic BP \>100 mmHg), uncontrolled diabetes, or active bleeding signs. 5. Poorly controlled cardiac diseases, including NYHA Class II or higher heart failure, unstable angina, myocardial infarction within 1 year, or clinically significant supraventricular/ventricular arrhythmias requiring treatment. 6. Active infections, including: Hepatitis B (HBsAg-positive AND HBV DNA ≥2000 IU/mL, excluding drug-induced or other non-viral hepatitis); Hepatitis C (anti-HCV antibody-positive AND HCV RNA above the lower limit of detection); HIV infection; or uncontrolled active bacterial, viral, fungal, rickettsial, or parasitic infections (unless treated and resolved before study drug initiation). 7. History of hypersensitivity to any component of Pucotenlimab or Vebreltus (e.g., histidine, histidine hydrochloride, sucrose, mannitol, polysorbate 80), or ≥Grade 3 allergic reactions to macromolecular protein preparations/monoclonal antibodies. 8. Primary immunodeficiency history or active autoimmune disease requiring immunosuppressants or systemic glucocorticoids (dose ≥10 mg/day prednisone or equivalent within 2 weeks before enrollment). Note: Patients with type I diabetes, stable hypothyroidism on hormone replacement, psoriasis/eczema not requiring systemic therapy, or vitiligo may be enrolled. Topical/inhaled corticosteroids or short-term (≤7 days) glucocorticoid use for non-autoimmune conditions are exempted. 9. History or presence of interstitial lung disease, radiation pneumonitis, severe chronic obstructive pulmonary disease, severe respiratory insufficiency, or symptomatic bronchospasm. 10. Positive serum pregnancy test, lactation, or unwillingness to use adequate contraception during the study and for 6 months after the last dose. 11. Other conditions deemed inappropriate for participation by the investigator (e.g., alcohol/drug abuse).