dMR During First Line Treatment of Non Squamous Lung Cancer: Time Course and Prognostic and Predictive Impact.

Inclusion Criteria:

1. Written informed consent obtained prior to any study-specific procedure
2. Age ≥18 years
3. Able to comply with the protocol
4. Histologically or cytologically documented inoperable, metastatic (Stage IV) non small cell lung cancer
5. ECOG PS status 0-1
6. Life expectancy ≥12 weeks
7. Adequate haematological function:

   * Normal values of absolute neutrophil and platelet count, and a hemoglobin value ≥9 g/dL
8. Adequate liver function:

   * Total bilirubin \<1.5 x ULN, AST, ALT \<2.5 x ULN
9. Adequate renal function:

   * Calculated creatinine clearance ≥50 mL/min, a urine dipstick for proteinuria \<2+.
10. Normal values of INR within 7 days prior to enrolment
11. If female, should not be pregnant or breast-feeding. Women with an intact uterus (unless amenorrhoeic for the last 24 months) must have a negative serum pregnancy test within 28 days prior to enrolment into the study.

Exclusion Criteria:

1. Mixed, non-small cell and small cell tumours or mixed adenosquamous carcinomas with a predominant squamous component
2. Known EGFR mutation or ALK translocation
3. History of haemoptysis
4. Evidence of tumour invading major blood vessels on imaging. The investigator or the local radiologist must exclude evidence of tumour that is fully contiguous with, surrounding, or extending into the lumen of a major blood vessel (e.g. pulmonary artery or superior vena cava)
5. Evidence of CNS metastases, even if previously treated. If suspected, the patient should be scanned within 28 days prior to enrolment to rule out CNS metastases
6. Previous treatment with chemotherapy or other anticancer agent
7. Previous radiotherapy of the primary tumour. Palliative extrathoracic radiotherapy is allowed prior to enrolment or during treatment
8. Major surgery (including open biopsy), significant traumatic injury within 28 days prior to enrolment or anticipation of the need for major surgery during study treatment
9. Minor surgery, including insertion of an indwelling catheter, within 24 hours prior to the first bevacizumab infusion
10. Current or recent (within 10 days of first dose of bevacizumab) use of aspirin (\> 325mg/day) or use of full-dose oral or parenteral anticoagulants or thrombolytic agent for therapeutic purposes.
11. History or evidence of inherited bleeding diathesis or coagulopathy with the risk of bleeding
12. Uncontrolled hypertension (systolic \>150 mmHg and/or diastolic \>100 mmHg)
13. Clinically significant (i.e. active) cardiovascular disease
14. Non-healing wound, active peptic ulcer or bone fracture
15. History of abdominal fistula, gastrointestinal perforation or intra-abdominal abscess within 6 months of enrolment
16. Women with an intact uterus (unless amenorrhoeic for the last 24 months) not using effective, means of contraception during the study and for a period of 6 months following the last administration of bevacizumab. Men who do not agree to use effective contraception during the study and for a period of 90 days following the last administration of bevacizumab. Men who do not agree to use effective contraception during the study and for a period of 90 days following the last administration of bevacizumab
17. Treatment with any other investigational agent, or participation in another clinical trial within 28 days prior to enrolment
18. Known hypersensitivity to bevacizumab or any of its excipients, and any of the chemotherapies
19. Evidence of ongoing or active infection, any other disease, neurological or metabolic dysfunction, physical examination finding or laboratory finding giving reasonable suspicion of a disease or condition that contraindicates the use of an investigational drug or puts the patient at high risk for treatment-related complications
20. Patients diagnosed with a tracheo-oesophageal fistula
21. History of thrombotic disorders within the last 6 months prior to enrolment.
22. Contraindications for MRI: pacemaker and/or non-MRI compatible metallic implants/objects/devices/fragments.