Dose-escalation Study of Oral Administration of S 55746 in Patients With Chronic Lymphocytic Leukaemia and B-Cell Non-Hodgkin Lymphoma

Inclusion Criteria:

* Women or men aged \>/=18 years
* Patients with a measurable histologically confirmed Follicular Lymphoma (FL), Mantle Cell Lymphoma (MCL), Diffuse Large B-Cell Lymphoma (DLBCL), Small Lymphocytic Lymphoma (SLL) and Marginal Zone Lymphoma (MZL) (Arm A), or patients with an evaluable immunophenotypically confirmed CLL (Arm B), or patients with a measurable Multiple Myeloma t(11;14) (arm A expansion part) according to International Myeloma Working Group (IMWG) criteria
* Relapsed after or refractory disease to standard treatments, and require treatment in the opinion of the investigator
* Estimated life expectancy \> 12 weeks
* World Health Organization (WHO) performance status 0-2
* Adequate bone marrow, renal and hepatic functions
* No evidence or treatment for another malignancy within 2 years prior to study entry. Curatively treated non-melanoma skin cancer, in situ carcinoma, or cervical intraepithelial neoplasia is allowed

Additional inclusion criteria for food interaction cohort:

* B-cell NHL patients at low risk of tumour lysis syndrome (TLS)
* Recent/concomitant treatment altering gastric pH

Exclusion Criteria:

* Previous treatment with a BH3 mimetic
* Previous therapy for the studied disease within 3 weeks before first intake
* Radioimmunotherapy, radiotherapy within 8 weeks before first intake
* Major surgery within 3 weeks before first day of study drug dosing
* Corticosteroids \>= 20 mg prednisone equivalent per day within 7 days before first intake
* Anticoagulant oral drugs, aspirin \> 325 mg/day within 7 days prior to first S 55746 intake
* Positive direct antiglobulin test (Coombs test) and haptoglobin below normal value
* Prior allogenic stem cell transplant
* Autologous stem cell transplant within 3 months before first intake
* NHL patients diagnosed with Post-Transplant Lymphoproliferative Disease, Burkitt's lymphoma, Burkitt-like lymphoma, or lymphoblastic lymphoma/leukaemia
* Human immunodeficiency virus (HIV)
* Known acute or chronic hepatitis B or hepatitis C
* Impaired cardiac function
* Medications known to prolong corrected QT (QTc) interval
* History or/ clinically suspicious for cancer- related Central Nervous System disease
* Solitary extramedullary plasmacytoma
* Laboratory Signs of TLS
* Strong or moderate CYP3A4 inhibitors/inducers (treatment, food or drink products)
* Treatment highly metabolized by the CYP3A4 or CYP2D6 and/or substrates with a narrow therapeutic index, multienzyme and/or OATP and/or P-gp substrates or herbal products.
* Known hypersensitivity to rasburicase
* Glucose-6-phosphate dehydrogenase (G6PD) deficiency and other cellular metabolic disorders known to cause haemolytic anaemia
* Patients receiving proton pump inhibitor