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Inclusion Criteria:

1. Signed and dated informed consent, and willing and able to comply with protocol requirements
2. Histologically proven adenocarcinoma of the colon and/or rectum
3. Metastatic disease confirmed clinically/radiologically, and evaluable by dynamic contrast ultrasound
4. No prior therapy for metastatic disease
5. Duly documented inoperable metastatic disease, i.e. not suitable for complete curative surgical resection
6. At least one measurable or evaluable lesion as assessed by CT-scan or MRI (Magnetic Resonance Imaging) according to RECIST v1.1
7. Age ≥ 18 years
8. Eastern Cooperative Oncology Group (ECOG) Performance status (PS) 0-2
9. Adequate hematological status: neutrophils (ANC) ≥ 1.5 x109/L; platelets ≥ 100x109/L; haemoglobin ≥ 9g/ dL
10. Adequate renal function: serum creatinine level \< 1.5 mg/dl and Glomerular Filtration Rate \> 50 ml/min by cockroft/ Gault formula
11. Adequate liver function: serum bilirubin ≤ 1.5 x upper normal limit (ULN), alkaline phosphatase, Aspartate Aminotransferase (AST), Alanine Aminotransferase (ALT) \< 5 x ULN
12. Proteinuria \< 2+ (dipstick urinalysis) or ≤ 1g/24 hour
13. Female patients must commit to using reliable and appropriate methods of contraception until at least 6 months after the end of Aflibercept and 3 months after the end of Irinotecan (when applicable). Male patients with a partner of childbearing potential must agree to use contraception in addition to having their partner use another contraceptive method until at least 6 months after the end of Aflibercept and 3 months after the end of Irinotecan.

Exclusion Criteria:

1. Uncontrolled hypercalcemia
2. Uncontrolled systemic hypertension (defined as systolic blood pressure \>150 mmHg and/or diastolic blood pressure \>100 mmHg despite medical therapy), or history of hypertensive crisis, or hypertensive encephalopathy
3. Right-left shunt or severe pulmonary arterial hypertension (pulmonary artery pressure \> 90 mmHg)
4. Respiratory distress syndrome
5. Concomitant antitumor therapy (e.g. chemotherapy, molecular targeted therapy, immunotherapy)
6. Treatment with any other investigational medicinal product within 28 days prior to study entry
7. History or presence of Central Nervous System (CNS) metastasis unless adequately treated (e.g. non irradiated CNS metastasis, seizures not controlled with standard medical therapy)
8. Gilbert's syndrome
9. Intolerance to atropine sulfate or loperamide
10. Known dihydropyrimidine dehydrogenase deficiency
11. Treatment with Cytochrome P450 3A4 (CYP3A4) inducers unless discontinued \> 7 days prior to registration
12. Any of the following in 3 months prior to inclusion: grade 3-4 gastrointestinal bleeding (unless due to resected tumor), treatment resistant peptic ulcer disease, erosive esophagitis or gastritis, infectious or chronic inflammatory bowel disease, or diverticulitis
13. Other concomitant or previous malignancy, except: i/ adequately treated in-situ carcinoma of the uterine cervix, ii/ basal or squamous cell carcinoma of the skin, iii/ cancer in complete remission for \> 5 years,
14. Any other serious and uncontrolled non-malignant disease, major surgery or traumatic injury within the last 28 days
15. Pregnant or breastfeeding women
16. Patients with known allergy to any excipients to study drugs (including hypersensitivity to sulphur hexafluoride or to any of the components of SonoVue)
17. History of myocardial infarction and/or stroke or other arterial thrombotic events or pulmonary embolism or unstable angina pectoris within 6 months prior to registration
18. Poorly controlled cardiac arrhythmias
19. Typical Angina Pectoris at rest within the previous 7 days, or significant worsening of cardiac symptoms in the previous 7 days, or recent intervention on the coronary arteries or other factors suggesting clinical instability (eg recent deterioration of ECG changes in clinical parameters or biological), or acute heart failure, or heart failure stage III or IV, or severe arrhythmias
20. Bowel obstruction
21. History of severe tumour bleeding or bleeding disorders
22. Poorly controlled anti-coagulation therapy (INR \> 3.0 on coumadin or heparin compounds)
23. Palliative radiation therapy within 4 weeks prior to registration
24. St John's Wort medication

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