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Stereotactic Ablative Radiotherapy (SABR) combined with Fruquintinib (anti-VEGFR TKI, targeted agent) and Tislelizumab (anti PD-1, immunotherapy)

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Inclusion Criteria

Inclusion Criteria:

Aged over 18 years old, regardless of gender
Fully informed and willing to provide written informed consent for the trial
ECOG performance status 0-1
Has an investigator determined life expectancy of at least 6 months
Histologically or cytologically confirmed stage IV colorectal cancer (UICC 8th version)
Has at least 2 measurable oligometastatic lesions on imaging (RECIST version 1.1). One will be treated with SABR and the other will be biopsied and evaluated against RECIST 1.1.
Has progressive disease after receiving first-line standard antitumor therapy (chemotherapeutic agents including fluorouracil, oxaliplatin and irinotecan); previous neoadjuvant or adjuvant pelvic area radiotherapy is allowed; subjects included in the safety introduction phase may include third-line treatment or above, but these subjects will not be included in the final statistical analysis.
Subjects receiving adjuvant oxaliplatin should progress during adjuvant therapy or within 6 months after completion.
Demonstrate adequate organ function (bone marrow, liver, kidney and clotting function) within 7 days before the first administration without using blood products or hematopoietic stimulating factors.
Subjects who withdraw from standard treatment before disease progressing due to unacceptable toxicity and exclude the use of the same drug are also allowed to be included.
Non pregnant or lactating patients. Effective contraceptive methods should be used during the study and within 6 months of the last administration.

Exclusion Criteria

Exclusion Criteria:

Pregnant or lactating women
The presence of a clinically detectable second primary malignancy, or history of other malignancies within 5 years excluding adequately treated non-melanoma skin cancer, carcinoma in situ of cervix and superficial bladder tumor (non-invasive tumor, or carcinoma in situ, or T1)
Baseline laboratory indicators do not meet the following criteria: neutrophils ≥1.5×10^9/L, Hb≥90g/L, PLT≥100×10^9/L , ALT ≤2.5 ULN, AST ≤2.5 ULN, Cr≤ 1.5 ULN or creatinine clearance rate 140mmHg or DBP > 90mmHg
Receiving radiotherapy within 4 weeks
Receiving anti-VEGF or anti-EGFR therapy within 4 weeks
Stroke event or transient ischemic attack occurred within 12 months
A history of arterial thrombosis or deep vein thrombosis within 6 months; a history of bleeding or evidence of bleeding tendency within 2 months
A histroy of heart disease within 6 months (including congestive heart failure, acute myocardial infarction, severe/unstable angina, coronary artery bypass grafting, cardiac insufficiency ≥ NYHA grade 2 and LVEF<50%)
Uncontrolled malignant pleural effusion, ascites, or pericardial effusion
Previous treatment with immunotherapy or fruquintinib
The presence of gastrointestinal diseases such as gastric or duodenal active ulcers, ulcerative colitis or unresected tumors with active bleeding; or other conditions likely to cause gastrointestinal bleeding or perforation; or unhealed gastrointestinal perforation or gastrointestinal fistula after surgical treatment
A history of liver disease including, but not limited to HBV infection or HBV DNA positive(≥1×10^4/ml), HCV infection or HCV DNA positive(≥1×10^3/ml) and liver cirrhosis
Serious mental abnormalities