| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated | 
| Haematological malignancy |  | 
| E.1.1.1 | Medical condition in easily understood language | 
| Cancer of type T white blood cells |  | 
| E.1.1.2 | Therapeutic area | Diseases [C] - Cancer [C04] | 
| MedDRA Classification | 
| E.1.2 Medical condition or disease under investigation | 
| 
| E.1.2 | Version | 19.0 |  
| E.1.2 | Level | PT |  
| E.1.2 | Classification code | 10042987 |  
| E.1.2 | Term | T-cell type acute leukaemia |  
| E.1.2 | System Organ Class | 10029104 - Neoplasms benign, malignant and unspecified (incl cysts and polyps) |  | 
| E.1.2 Medical condition or disease under investigation | 
| 
| E.1.2 | Version | 19.0 |  
| E.1.2 | Level | PT |  
| E.1.2 | Classification code | 10036543 |  
| E.1.2 | Term | Precursor T-lymphoblastic lymphoma/leukaemia |  
| E.1.2 | System Organ Class | 10029104 - Neoplasms benign, malignant and unspecified (incl cysts and polyps) |  | 
| E.1.3 | Condition being studied is a rare disease | No | 
| E.2 Objective of the trial | 
| E.2.1 | Main objective of the trial | 
| To evaluate the efficacy of isatuximab. |  | 
| E.2.2 | Secondary objectives of the trial | 
| -To evaluate the safety profile of isatuximab. -To evaluate the duration of response (DOR).
 -To evaluate progression free survival (PFS) and overall survival (OS).
 -To evaluate the pharmacokinetics (PK) of isatuximab in patients with T-ALL or T-LBL.
 -To evaluate immunogenicity of isatuximab in patients with T-ALL or T-LBL.
 -To assess minimal residual disease (MRD) and correlate it with clinical outcome.
 |  | 
| E.2.3 | Trial contains a sub-study | No | 
| E.3 | Principal inclusion criteria | 
| -Patients must have a known diagnosis of ALL of T cell origin, including T-LBL and T-ALL with extramedullary involvement at relapse confirmed by biopsy. -Patients must be previously treated for T-ALL or T-LBL and have relapsed or are refractory to most recent treatment. Patients in first relapse will be eligible regardless of the first remission duration.
 -Patients must have been previously exposed to nelarabine in countries where this drug is available (unless due to a contraindication to its use or administrative issue).
 -No more than 3 prior salvage therapies.
 |  | 
| E.4 | Principal exclusion criteria | 
| - Prior treatment with immunotherapy/investigational agents within 3 weeks, chemotherapy within 2 weeks of study treatment. Must have recovered from acute toxicity before first study treatment administration. - Prior stem cell transplant within 4 months and/or evidence of active systemic Graft versus Host Disease and/or immunosuppressive therapy for Graft versus Host Disease within 1 week before the first study treatment administration.
 - Clinical evidence of active central nervous system (CNS) leukemia.
 - T-ALL with testicular involvement alone.
 |  | 
| E.5 End points | 
| E.5.1 | Primary end point(s) |  | 
| E.5.1.1 | Timepoint(s) of evaluation of this end point | 
| 6 months after last patient 1st administration (Day 1), 12 months after last patient 1st administration (Day 1) |  | 
| E.5.2 | Secondary end point(s) | 
| 1/ Duration of response - time 2/ Progression free survival - time
 3/ Overall survival - time
 |  | 
| E.5.2.1 | Timepoint(s) of evaluation of this end point | 
| 1-2-3 : 6 months after last patient 1st administration (Day 1), 12 months after last patient 1st administration (Day 1) |  | 
| E.6 and E.7 Scope of the trial | 
| E.6 | Scope of the trial | 
| E.6.1 | Diagnosis | No | 
| E.6.2 | Prophylaxis | No | 
| E.6.3 | Therapy | No | 
| E.6.4 | Safety | Yes | 
| E.6.5 | Efficacy | Yes | 
| E.6.6 | Pharmacokinetic | Yes | 
| E.6.7 | Pharmacodynamic | Yes | 
| E.6.8 | Bioequivalence | No | 
| E.6.9 | Dose response | No | 
| E.6.10 | Pharmacogenetic | Yes | 
| E.6.11 | Pharmacogenomic | No | 
| E.6.12 | Pharmacoeconomic | No | 
| E.6.13 | Others | No | 
| E.7 | Trial type and phase | 
| E.7.1 | Human pharmacology (Phase I) | No | 
| E.7.1.1 | First administration to humans | No | 
| E.7.1.2 | Bioequivalence study | No | 
| E.7.1.3 | Other | No | 
| E.7.1.3.1 | Other trial type description |  | 
| E.7.2 | Therapeutic exploratory (Phase II) | Yes | 
| E.7.3 | Therapeutic confirmatory (Phase III) | No | 
| E.7.4 | Therapeutic use (Phase IV) | No | 
| E.8 Design of the trial | 
| E.8.1 | Controlled | No | 
| E.8.1.1 | Randomised | No | 
| E.8.1.2 | Open | Yes | 
| E.8.1.3 | Single blind | No | 
| E.8.1.4 | Double blind | No | 
| E.8.1.5 | Parallel group | No | 
| E.8.1.6 | Cross over | No | 
| E.8.1.7 | Other | No | 
| E.8.2 | Comparator of controlled trial | 
| E.8.2.1 | Other medicinal product(s) | No | 
| E.8.2.2 | Placebo | No | 
| E.8.2.3 | Other | No | 
| E.8.2.4 | Number of treatment arms in the trial | 1 | 
| E.8.3 | The trial involves single site in the Member State concerned | Yes | 
| E.8.4 | The trial involves multiple sites in the Member State concerned | No | 
| E.8.5 | The trial involves multiple Member States | Yes | 
| E.8.5.1 | Number of sites anticipated in the EEA | 17 | 
| E.8.6 Trial involving sites outside the EEA | 
| E.8.6.1 | Trial being conducted both within and outside the EEA | Yes | 
| E.8.6.2 | Trial being conducted completely outside of the EEA | No | 
| E.8.6.3 | If E.8.6.1 or E.8.6.2 are Yes, specify the regions in which trial sites are planned | 
| Finland |  
| France |  
| Hungary |  
| Italy |  
| Lithuania |  
| Russian Federation |  
| United States |  | 
| E.8.7 | Trial has a data monitoring committee | No | 
| E.8.8 | Definition of the end of the trial and justification where it is not the last
                        visit of the last subject undergoing the trial |  | 
| E.8.9 Initial estimate of the duration of the trial | 
| E.8.9.1 | In the Member State concerned years | 3 | 
| E.8.9.1 | In the Member State concerned months | 6 | 
| E.8.9.1 | In the Member State concerned days | 0 | 
| E.8.9.2 | In all countries concerned by the trial years | 3 | 
| E.8.9.2 | In all countries concerned by the trial months | 8 | 
| E.8.9.2 | In all countries concerned by the trial days | 0 |