Efficacy of FOLFOX+Bevacizumab in Combination With Irinotecan in the Treatment of Metastatic Colorectal Cancer

Inclusion Criteria: 1. Patients with histologically confirmed diagnosis of stage IV (UICC) colorectal cancer (primary tumor may be present) 2. Patients with at least one measurable lesion, with size \> 1 cm (RECIST v1.1) 3. ECOG Performance status ≤ 2 (ECOG 2, only if tumor related) 4. Patients, who are able to tolerate intensive first lien treatment as judged by the investigator 5. Life expectancy \> 3 months 6. Age ≥ 18 years 7. Haematologic function: ANC ≥ 1.5 x 109/L, platelets ≥ 100 x109/L, hemoglobin * 9 g/dl or 5.59 mmol/l 8. Patients not receiving therapeutic anticoagulation must have an INR \< 1.5 ULN and aPTT \< 1.5 ULN within 7 days prior to registration. The use of full dose anticoagulants is allowed as long as the INR or aPTT is within therapeutic limits (according to the medical standard in the institution) and the patient has been on a stable dose for anticoagulants for at least two weeks at the time of registration. 9. Adequate liver function as measured by serum transaminases (AST \& ALT) ≤ 2.5 x ULN (in case of liver metastases \< 5 x ULN) and total bilirubin ≤ 1.5 x ULN 10. Adequate renal function: Serum creatinine ≤ 1.5 x ULN 11. Signed, written informed consent Exclusion Criteria: 1. Patients with histologically confirmed diagnosis of stage IV (UICC) colorectal cancer (primary tumor may be present) 2. Patients with at least one measurable lesion, with size \> 1 cm (RECIST v1.1) 3. ECOG Performance status ≤ 2 (ECOG 2, only if tumor related) 4. Patients, who are able to tolerate intensive first lien treatment as judged by the investigator 5. Life expectancy \> 3 months 6. Age ≥ 18 years 7. Haematologic function: ANC ≥ 1.5 x 109/L, platelets ≥ 100 x109/L, hemoglobin * 9 g/dl or 5.59 mmol/l 8. Patients not receiving therapeutic anticoagulation must have an INR \< 1.5 ULN and aPTT \< 1.5 ULN within 7 days prior to registration. The use of full dose anticoagulants is allowed as long as the INR or aPTT is within therapeutic limits (according to the medical standard in the institution) and the patient has been on a stable dose for anticoagulants for at least two weeks at the time of registration. 9. Adequate liver function as measured by serum transaminases (AST \& ALT) ≤ 2.5 x ULN (in case of liver metastases \< 5 x ULN) and total bilirubin ≤ 1.5 x ULN 10. Adequate renal function: Serum creatinine ≤ 1.5 x ULN 11. Signed, written informed consent