INTEGRATEIIb: This Phase III trial is trying to determine if a combined treatment of targeted and immunotherapy drugs (regorafenib and nivolumab) is more effective than the current standard chemotherapy treatments in people with advanced gastro-oesophageal cancerA Randomised Phase III Open Label Study of Regorafenib + Nivolumab vs Standard Chemotherapy in Refractory Advanced Gastro-Oesophageal Cancer (AGOC)

Exclusion

1. Known allergy to the investigational product drug class or excipients in the regorafenib and/or nivolumab
2. Poorly-controlled hypertension (systolic blood pressure >140mmHg or diastolic pressure> 90mmHg despite optimal medical management).
3. Participants with known, uncontrolled malabsorption syndromes
4. Any prior anti-VEGF targeted therapy using small molecule VEGF TKIs (e.g. apatinib). Prior anti-VEGF targeted monoclonal antibody therapies (e.g. bevacizumab and ramucirumab) are permitted.
5. Any prior use of more than one immune checkpoint inhibitor
6. Treatment with any previous drug therapy within 2 weeks prior to first dose of study treatment. This includes any investigational therapy.
7. Use of biological response modifiers, such as granulocyte colony stimulating factor (G-CSF), within 3 weeks prior to randomisation.
8. Concurrent treatment with strong CYP3A4 inhibitors or inducers.
9. Palliative radiotherapy, unless more than 14 days have elapsed between completion of radiation and the date of registration, and adverse events resulting from radiation have resolved to < Grade 2 according to CTCAE V5.0
10. Major surgical procedure, open biopsy, or significant traumatic injury within 28 days prior to randomization
11. Arterial thrombotic or ischaemic events, such as cerebrovascular accident, within 6 months prior to randomization.
12. Venous thrombotic events and pulmonary embolism within 3 months prior to randomization
13. Any haemorrhage or bleeding event ≥ Grade 3 according to CTCAE v5.0 within 4 weeks prior to randomization.
14. Non-healing wound, ulcer, or bone fracture.
15. Interstitial lung disease with ongoing signs and symptoms
16. Clinical hyperthyroidism or hypothyroidism. Note: non-clinically significant abnormal TFTs (abnormal TSH and abnormal T3 and/or abnormal T4) considered to be due to sick euthyroid syndrome is allowed.
17. Persistent proteinuria of ≥ Grade 3 according to CTCAE v5.0 (equivalent to > 3.5g of protein over 24 hour measured on either a random specimen or 24 hour collection.
18. Uncontrolled metastatic disease to the central nervous system. To be eligible, known CNS metastases should have been treated with surgery and/or radiotherapy and the patient should have been receiving a stable dose of steroids for at least 2 weeks prior to randomization, with no deterioration in neurological symptoms during this time.

19. History of another malignancy within 2 years prior to randomization. Participants with the following are eligible for this study:

    1. curatively treated cervical carcinoma in situ,
    2. non-melanomatous carcinoma of the skin,
    3. superficial bladder tumours (T1a [Non-invasive tumour], and Tis [Carcinoma in situ]),
    4. treated thyroid papillary cancer
20. Any significant active infection, including chronic active hepatitis B, hepatitis C, or HIV. Testing for these is not mandatory unless clinically indicated. Participants with known Hepatitis B/C infection will be allowed to participate providing evidence of viral suppression has been documented and the patient remains on appropriate anti-viral therapy.
21. Patients with acute coronary syndrome (including myocardial infarction and unstable angina), and with a history of coronary angioplasty or stent placement performed within 6 months before enrolment
22. Patients with a ≥ grade 3 active infection according to CTCAE version 5.0
23. Patients with concurrent autoimmune disease, or a history of chronic or recurrent autoimmune disease
24. Patients who require systemic corticosteroids (excluding temporary usage for tests, prophylactic administration for allergic reactions, or to alleviate swelling associated with radiotherapy; if used as replacement therapy e.g. ≤ 10 mg prednisolone or dexamethasone ≤ 2 mg per day) or immunosuppressants, or who have received such a therapy < 14 days prior to randomisation
25. Patients with a seizure disorder who require pharmacotherapy
26. Serious medical or psychiatric condition(s) that might limit the ability of the patient to comply with the protocol.
27. Pregnancy, lactation, or inadequate contraception. Women must be post-menopausal infertile, or use a reliable means of contraception. Women of childbearing potential must have a negative pregnancy test done within 7 days prior to randomization. Men must have been surgically sterilized or use a barrier method of contraception.