Single-arm, Single-center, Exploratory Phase II Clinical Study of Envafolimab Combined With Chemoradiotherapy in the Treatment of Locally Advanced pMMR/MSS Rectal Cancer
试验速览
- 阶段
- 2 期
- 状态
- 招募中
- 发起方
- 入组人数
- 35
- 试验地点
- 1
- 主要终点
- pCR
研究概览
简要总结
Preoperative radiotherapy combined with 5-fluorouracil/capecitabine is currently the standard treatment for locally advanced rectal cancer. Although this strategy effectively reduces the risk of local recurrence, it fails to effectively improve the overall survival rate of patients . The root cause is that 5-fluorouracil/capecitabine based local radiotherapy is not effective in controlling potential micrometastases. Therefore, many studies try to combine preoperative radiotherapy with more intense chemotherapy and targeted drugs at the same time, as well as induction chemotherapy before preoperative radiotherapy and consolidation chemotherapy after, in order to obtain better efficacy. However, a number of studies have shown that increasing cytotoxic drugs fail to effectively improve pathologic complete response rate (pCR) and long-term survival rate, and significantly increase therapeutic toxicity . Therefore, the idea of trying to increase the efficacy of cytotoxic drugs by accumulating them does not work.Based on the use of PD-1/PD-L1 antibody in colorectal cancer and other solid tumors, and referring to the scheme of PD-1/PD-L1 antibody combined with radiotherapy in other solid tumors, we added envafolimab to local radiotherapy for advanced rectal cancer for exploration, with a view to further improving the pCR rate and long-term survival of patients.
详细描述
Inclusion criteria：
- Disease characteristics • Histologically confirmed rectal adenocarcinoma; Immunohistochemical confirmation as pMMR or/and pCR or/and NGS test as MSS;
• Tumor location within 12cm from anal margin;
- Locally advanced rectal cancer (stage II-III, i.e. cT3-4 and/or N+) as assessed by the UICC/AJCC TNM staging system (8th edition, 2017);
* Preoperative staging method: pelvic MRI/ transrectal ultrasound combined with preoperative staging.
- No signs of intestinal obstruction; Or intestinal obstruction has been relieved after proximal colostomy surgery;
- Preoperative chest, abdominal and pelvic CT to exclude distant metastasis.
- Patient characteristics
• Age: 18 ~75 years old;
- Activity status score: ECOG 0-1;
- Life expectancy: more than 2 years;
- Hematology: WBC>3500×106/L; PLT>100000×106/L; Hb>10g/dL;
- Liver function: SGOT and SGPT are less than 1.5 times of normal value; Bilirubin less than 1.5mg/dL;
- Kidney function: creatinine <1.8mg/dL;
- Other: non-pregnant or breastfeeding women; No other malignant disease (other than non-melanoma or carcinoma in situ of the cervix) within 5 years or during the same period; Does not have a mental illness that prevents informed consent; There were no other serious diseases associated with shorter survival.
- Patients or family members can understand the study protocol and are willing to participate in the study, and sign a written informed consent;
- Good patient compliance, voluntary follow-up, treatment, laboratory tests, and other research steps as scheduled.
- Prior treatment • No previous rectal cancer surgery;
研究设计
- 研究类型
- Interventional
- 分配方式
- Na
- 干预模型
- Single Group
- 主要目的
- Treatment
- 盲法
- None
入排标准
- 年龄范围
- 18 Years 至 75 Years（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Disease characteristics
- •Histologically confirmed rectal adenocarcinoma; Immunohistochemical confirmation as pMMR or/and pCR or/and NGS test as MSS;
- •Tumor location within 12cm from anal margin;
- •Locally advanced rectal cancer (stage II-III, i.e. cT3-4 and/or N+) as assessed by the UICC/AJCC TNM staging system (8th edition, 2017);
- •* Preoperative staging method: pelvic MRI/ transrectal ultrasound combined with preoperative staging.
- •No signs of intestinal obstruction; Or intestinal obstruction has been relieved after proximal colostomy surgery;
- •Preoperative chest, abdominal and pelvic CT to exclude distant metastasis. 2) Patient characteristics
- •Age: 18 ~75 years old;
- •Activity status score: ECOG 0-1;
- •Life expectancy: more than 2 years;
- •Hematology: WBC>3500×106/L; PLT>100000×106/L; Hb>10g/dL;
- •Liver function: SGOT and SGPT are less than 1.5 times of normal value; Bilirubin less than 1.5mg/dL;
- •Kidney function: creatinine <1.8mg/dL;
- •Other: non-pregnant or breastfeeding women; No other malignant disease (other than non-melanoma or carcinoma in situ of the cervix) within 5 years or during the same period; Does not have a mental illness that prevents informed consent; There were no other serious diseases associated with shorter survival.
- •Patients or family members can understand the study protocol and are willing to participate in the study, and sign a written informed consent;
- •Good patient compliance, voluntary follow-up, treatment, laboratory tests, and other research steps as scheduled.
- •Prior treatment
- •No previous rectal cancer surgery;
- •No previous chemotherapy or radiation therapy;
- •No previous biotherapy;
- •Previous endocrine therapy: No restriction.
排除标准
- •CRC for microsatellite highly unstable (MSI-H) or mismatch repair protein expression deficiency (dMMR); Chronic hepatitis B or C with a history or active HIV infection (high copy of viral DNA);
- •Autoimmune diseases;
- •Other active clinical serious infections (>NCI-CTC version 3.0);
- •Stage I patients;
- •Preoperative evidence of distant metastasis;
- •Dysfluid, organ function decompensation;
- •A history of pelvic or abdominal radiotherapy;
- •Multiple primary cancers;
- •Patients whose seizures require management (such as steroid or antiepileptic therapy);
- •A history of other malignancies within 5 years, except for cured cervical carcinoma in situ or skin basal cell carcinoma;
- •Chronic inflammatory bowel disease, intestinal obstruction; Substance abuse and medical, psychological or social conditions that may interfere with the patient's participation in the study or the evaluation of the findings;
- •A known or suspected allergy to the study drug or to any drug administered in connection with this trial;
- •Any unstable conditions or conditions that may compromise patient safety and compliance
研究组 & 干预措施
neoadjuvant therapy
- Induction therapy stage: chemotherapy combined with immunotherapy for 2 cycles: Envafolimab: 200mg, subcutaneous injection, Q2W, 2 cycles; mFOLFOX6: Q2W, 2 cycles (concurrent administration of envollizumab on the first day of chemotherapy).
- Concurrent chemoradiotherapy: long-term chemoradiotherapy combined with immunotherapy for 3 cycles: radiation therapy: 50Gy/25f, 2Gy every day, 5 days a week for 5 weeks; Capecitabine: 825mg/m2 orally (1650mg/m2/d) twice a day in the morning and evening, 5 days a week, simultaneous with radiation therapy, for a total of 25 days; Envafolimab: 200mg, subcutaneous injection, Q2W, 3 cycles (Envafolimab was administered on day 1, day 15, and day 29 of radiotherapy).
Iii. Consolidation treatment stage: chemotherapy combined with immunotherapy for 2 cycles: Envafolimab: 200mg, subcutaneous injection, Q2W, 2 cycles; mFOLFOX6: Q2W, 2 cycles. (Concurrent administration of envafolimab on the first day of chemotherapy).
干预措施: Envafolimab combined with chemoradiotherapy in the whole course of neoadjuvant therapy (Drug)
结局指标
主要结局
pCR
时间窗: 3 months
Pathological complete response
次要结局
- TRG(3 months)