Anti-PD1 Antibody Toripalimab Combined With Gemox as First-line Therapy in Late-stage Intrahepatic Cholangiocarcinoma

A Phase 2 Study of Anti-PD1 Antibody Toripalimab Combined With Gemox (Gemcitabine and Oxaliplatin) as First-line Therapy in Patients With Advanced or Unresectable Intrahepatic Cholangiocarcinoma

To explore the objective response rate and safety of toripalimab combined with Gemox in the first-line treatment of progressive, metastatic or unresectable advanced ICC.

Studies have shown that the Gemox chemotherapy (oxaliplatin + gemcitabine) in patients with advanced biliary tract cancer has an objective response rate (ORR) of 22% (95% CI 6.5-37.4%) and a stable disease rate of 30%. The progression rate was 48%, the tumor progression-free survival (PFS) was 3.9 months and the overall survival (OS) was 7.6 months. In recent years, monoclonal antibodies against programmed cell death protein 1 (PD1) and programmed cell death ligand 1 (PD-L1) such as nivolumab, Pembrolizumab, and Toripalimab. It has shown encouraging effects in the treatment of a variety of solid tumors. For advanced cholangiocarcinoma that cannot be resected or is accompanied by metastasis, NCCN guidelines (NCCN guidelines hepatobiliary cancer, 2020) recommend that the current treatment options are limited, and gemcitabine combined with platinum anti-tumor drugs (cisplatin, oxaliplatin, etc.) are recommended. Chemotherapy regimen as first-line treatment. For those with microsatellite instability, it is recommended to add a PD1 monoclonal antibody. The guidelines also specifically stated that the above recommendations lack evidence support from phase III clinical trials and encourage the development of clinical trial research. PD1 monoclonal antibody combined with chemotherapy in the treatment of advanced ICC may have a better effect than chemotherapy alone. Currently, as a first-line treatment, there is no research report on PD1 monoclonal antibody combined with Gemox in the treatment of advanced ICC.

Inclusion Criteria:

• 1. The patient must sign an informed consent form; 2. Age 18-75 years old, both male and female; 3. ECOG performance status score (PS score) 0 or 1 point; 4. Child-Pugh score A period; 5. Intrahepatic cholangiocarcinoma confirmed by histopathology; agree to provide previously stored tumor tissue specimens or fresh biopsy tumor lesions; 6. Unresectable ICC patients or postoperative diagnosis of ICC recurrence and metastasis, and have not received systemic treatment within 6 months; 7. The functional indicators of important organs meet the following requirements

  1. Neutrophils≥1.5*109/L; platelets≥100*109/L; hemoglobin≥9g/dl; serum albumin≥3g/dl;
  2. Thyroid-stimulating hormone (TSH) ≤ 2 times the upper limit of normal, and T3 and T4 are in the normal range;
  3. Bilirubin ≤ 1.5 times the upper limit of normal; ALT and AST ≤ 3 times the upper limit of normal;
  4. Serum creatinine ≤ 1.5 times the upper limit of normal, and creatinine clearance ≥ 60ml/min (calculated by Cockcroft-Gault formula); 8. The subject has at least 1 measurable lesion (according to RECIST1.1); 9. For women who are not breastfeeding or pregnant, use contraception during treatment or 3 months after the end of treatment.

Exclusion Criteria:

• 1. Pathological diagnosis of hepatocellular carcinoma, mixed hepatocellular carcinoma, and other malignant components of non-cholangiocarcinoma; 2. Past or simultaneous suffering from other malignant tumors, except for fully treated non-melanoma skin cancer, cervical carcinoma in situ, and thyroid papillary carcinoma; 3. Have used gemcitabine-based chemotherapy or have used PD-1 monoclonal antibody or PD-L1 monoclonal antibody treatment within 6 months; 4. Severe cardiopulmonary and renal dysfunction; 5. Hypertension that is difficult to control with drugs (systolic blood pressure (BP) ≥140 mmHg and/or diastolic blood pressure ≥90mmHg) (based on the average of ≥3 BP readings obtained by ≥2 measurements); 6. Abnormal coagulation function (PT>14s), have bleeding tendency or are receiving thrombolysis or anticoagulation therapy; 7. After antiviral treatment, HBV DNA>2000 copies/ml, HCV RNA>1000; 8. A history of esophageal and gastric varices, significant clinically significant bleeding symptoms or a clear tendency to appear within 3 months before enrollment; 9. Active infections requiring systemic treatment; patients with active tuberculosis infection within 1 year before enrollment; a history of active tuberculosis infection more than 1 year before enrollment, and no formal anti-tuberculosis treatment or tuberculosis Still in the active period; 10. Human immunodeficiency virus (HIV, HIV1/2 antibody) positive; 11. A history of psychotropic drug abuse, alcohol or drug abuse; 12. Known to have a history of severe allergies to any monoclonal antibodies, platinum drugs, or gemcitabine; 13. Other factors judged by the investigator may affect the safety of the subjects or the compliance of the trial. Such as serious diseases (including mental illness) that require combined treatment, serious laboratory abnormalities, or other family or social factors.