LEU01101: Safety and Preliminary Efficacy of LEU011 in Solid Tumours.

Inclusion Criteria: 1. Histologically and/or cytologically confirmed solid tumour. 2. 18 years or older at time of consent 3. Relapsed/refractory solid tumour with no standard treatment options available or suitable (e.g. hypersensitivity reaction) and no curative approach possible. 4. Tumour expression of NKG2DL protein. The minimum requirement is the presence of one or more ligands on 10% or more cells, encompassing tumour and/ or stroma. 5. At least one target lesion measurable by RECIST v1.1 criteria on CT or MRI scanning 6. Eastern Co-operative Oncology Performance Status of 0-1. 7. Normal cardiac function as assessed by electrocardiography and echocardiography (ECHO. Left ventricular ejection fraction must be normal according to institutional values. 8. Baseline oxygen saturation of at least 95% 9. Haematology results must show: * neutrophils \>1.5 x 109/L, * platelets \>100 x 109/L, * haemoglobin \>90g/L, * INR \<1.5. * Lymphocytes \>0.4 x 109/L 10. Biochemistry results must show: * creatinine clearance \> 40 mL/min/1.73 m2 (calculated using the Chronic Kidney Disease Epidemiology \[CKD-EPI\] equation); bilirubin \<1.25 times ULN; * ALT/ AST \<2.5 times ULN (\<5 times ULN if liver metastases present); * Albumin \> 30g/L 11. Women of childbearing potential (WOCBP) and men who participate in this trial must use forms of highly effective contraception that result in a failure rate of \<1% from time of consent to at least 12 months after the last dose of fludarabine / cyclophosphamide or LEU011 (whichever comes last), or sexual abstinence for the duration of the trial. WOCBP must have a negative serum or urine pregnancy test 12. Disease amenable to biopsy. 13. Life expectancy of at least 6 months, in the investigator's opinion. 14. Written informed consent prior to any trial procedure and registration. 15. Subjects must agree to participate in an additional LTFU trial for up to 15 years after completion of this trial. Exclusion Criteria: 1. Central nervous system (CNS) involvement by malignancy unless (i) have completed effective treatment of their CNS disease (ii) are asymptomatic and not requiring steroids, and (iii) at least stable findings on CNS imaging and no evidence of leptomeningeal disease for at least 6 months prior to study enrolment. 2. Subjects with HIV-1, HIV-2, HTLV-1, HTLV-2, active Hepatitis B, active Hepatitis C or active Syphilis infection. Subjects without active Hepatitis B infection who are anti-core antibody positive can be considered for recruitment subject to suitability to receive nucleoside or nucleotide analogue prophylaxis. 3. Subject must not have received any anti-cancer treatment within 28 days of lymphodepletion (prior to LEU011). This criterion applies to the following additional therapies: (i) systemic corticosteroids (\> 20mg prednisolone/ day); (ii) any other systemic immunomodulatory agent (but see 11 below); (iii) radiotherapy (single fraction palliative radiotherapy to non-target lesion allowed); (iv) chemotherapy; (v) endocrine therapy or (vi) any investigational medicinal product. 4. Regarding (iv) Chemotherapy: Interval is extended to 6 weeks in the case of nitrosoureas. This criterion does not apply to the use of lymphodepleting chemotherapy prior to treatment with LEU011. 5. Prior LEU011 therapy. However, prior immune checkpoint blockade (e.g. anti-PD1, PD-L1 or CTLA-4) or immune agonist antibody therapy (e.g. anti-4-1BB, OX40, CD40 etc) does not preclude participation, but there must be a washout period of 30 days prior to treatment with LEU011. 6. Concurrent use of warfarin anticoagulant therapy and other coumarins is not permissible. Other classes of anticoagulant can be given. 7. The presence of major co-morbidity such as active major medical illness of the cardiovascular, respiratory or immune system that is likely to impair ability to undergo trial therapy, such as recent myocardial infarction, congestive cardiac failure, active gastrointestinal bleeding, active gastrointestinal ulceration, inflammatory bowel disease, ischaemic heart disease, peripheral arterial disease, pneumonitis, intestinal obstruction, sepsis or uncontrolled hypertension. 8. Clinically active autoimmune disease e.g., coeliac disease (an abnormal TTG antibody test precludes recruitment) or interstitial lung disease. Sub-clinical or quiescent autoimmune disease does not exclude from participation (e.g. euthyroid patients on thyroxine replacement therapy or patients with type 1 diabetes on insulin therapy). 9. Active infection that requires antimicrobial treatment. 10. Subjects who, in the Investigator's judgement, are unlikely to complete or comply with all protocol required study visits or procedures. 11. Hypersensitivity to any component of LEU011 (e.g. Albumin or DMSO allergy). 12. Cyclophosphamide or fludarabine allergy or contraindication. 13. Pregnancy. 14. Breastfeeding. 15. Subjects who have received a live vaccine four weeks or fewer before enrolment are ineligible for recruitment to the study. During treatment and for three months after treatment with fludarabine, administration of live vaccines is prohibited. None of the currently available covid 19 vaccines are considered to be live for this purpose since all are replication defective.