| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated  | 
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| E.1.1.1 | Medical condition in easily understood language  | 
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| E.1.1.2 | Therapeutic area  | Diseases [C] - Nutritional and Metabolic Diseases [C18] | 
| MedDRA Classification | 
| E.1.2 Medical condition or disease under investigation | 
| E.1.2 | Version  | 20.0 | 
 
| E.1.2 | Level  | PT | 
 
| E.1.2 | Classification code  | 10067584 | 
 
| E.1.2 | Term  | Type 1 diabetes mellitus | 
 
| E.1.2 | System Organ Class  | 10027433 - Metabolism and nutrition disorders | 
 
 
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| 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 compare the efficacy of HOE901-U300 to Lantus in terms of glycated hemoglobin (HbA1c) | 
 
 
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| E.2.2 | Secondary objectives of the trial  | 
-To compare HOE901-U300 and Lantus in terms of: -Percentage of patients reaching target HbA1c and fasting plasma glucose (FPG). -To assess the safety of HOE901-U300 including analysis of events of hypoglycemia, events of hyperglycemia with ketosis, and development of anti-insulin-antibodies. | 
 
 
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| E.2.3 | Trial contains a sub-study  |  Yes  | 
| E.2.3.1 | Full title, date and version of each sub-study and their related objectives | 
STUDY No: EFC13957 – CGM sub-study STUDY NAME: EDITION JUNIOR – CGM sub-study OBJECTIVE: To compare glucose patterns of HOE901-U300 and Lantus over the 24-hour period between once daily administration in children and adolescents with type 1 diabetes mellitus (T1DM) during 7 days at Month 6 and Month 12. | 
 
 
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| E.3 | Principal inclusion criteria  | 
-Children and adolescents with type 1 diabetes mellitus (T1DM) for at least 1 year confirmed by typical symptoms at diagnosis and/or by antibody testing (presence of anti-GAD [glutamic acid decarboxylase] or anti-IA2 [islet antigen 2/tyrosine phosphatase] or anti-islet cell antibodies) and/or clinical features (eg, history of ketoacidosis). -Signed written informed consent obtained from parent(s)/legal guardian and written or oral assent obtained from patient. | 
 
 
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| E.4 | Principal exclusion criteria | 
-Age <6 years and ≥18 years at randomization. -Less than 1 year on insulin treatment prior to screening visit. -Less than 6 months on basal plus mealtime insulin and self-monitoring of blood glucose prior to screening visit. -Patients using premix insulins in the last 3 months before screening visit or patients using human regular insulin as mealtime insulin in the last 3 months before screening visit. -Use of an insulin pump in the last 6 months before screening visit or plans to switch to pump within the next 6 months after screening visit. -No willingness to inject insulin glargine (Lantus or HOE901 [U300]) once daily. -HbA1c <7.5% or >11% at screening. -Initiation of any glucose-lowering medications in the last 3 months before screening visit. -Hospitalization or care in the emergency ward for diabetic ketoacidosis or history of severe hypoglycemia (as defined by need for glucagon or IV glucose) and accompanied by seizure and/or unconsciousness and/or coma in the last 3 months prior to screening visit. -Postmenarchal girls not protected by highly-effective method(s) of birth control and/or who are unwilling or unable to be tested for pregnancy. Abstinence from sexual intercourse will be considered as an acceptable form of birth control. -Pregnant or breast-feeding adolescents, or adolescents who intend to become pregnant during the study period, or who are at risk of getting pregnant due to any psychosocial reason during the study period. | 
 
 
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| E.5 End points | 
| E.5.1 | Primary end point(s) | 
| Change from baseline in HbA1c | 
 
 
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| E.5.1.1 | Timepoint(s) of evaluation of this end point | 
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| E.5.2 | Secondary end point(s) | 
1- Percentage of patients with HbA1c values of <7.5% without any episode of severe and/or documented (SMPG <54 mg/dL; 3.0 mmol/L) symptomatic hypoglycemia during the last 3 months of the main 6-month on-treatment period 2- Change from baseline in FPG 3- Percentage of patients with FPG of ≤130 mg/dL (7.2 mmol/L) without any episode of severe and/or documented (SMPG ≤54 mg/dL; 3.0 mmol/L) symptomatic hypoglycemia during the last 3 months of the main 6-month 4- Change from baseline in 24-hour mean plasma glucose based on 8-point self-monitored plasma glucose (SMPG) profiles 5- Change from baseline in variability of 24-hour mean plasma glucose based on 8-point SMPG profiles 6- Number (%) of patients with hypoglycemia 7- Number (%) of patients with hyperglycemia with ketosis 8- Number (%) of patients with adverse events | 
 
 
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| E.5.2.1 | Timepoint(s) of evaluation of this end point | 
1- Week 26 2- Baseline; Week 26 3- Week 26 4- Baseline; Week 26 5- Baseline; Week 26 6- Up to Month 12 7- Up to Month 12 8- Up to Month 12 | 
 
 
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| 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 |  No  | 
| E.6.8 | Bioequivalence |  No  | 
| E.6.9 | Dose response |  No  | 
| E.6.10 | Pharmacogenetic |  No  | 
| 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) |  No  | 
| E.7.3 | Therapeutic confirmatory (Phase III) |  Yes  | 
| E.7.4 | Therapeutic use (Phase IV) |  No  | 
| E.8 Design of the trial | 
| E.8.1 | Controlled |  Yes  | 
| E.8.1.1 | Randomised |  Yes  | 
| 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 |  Yes  | 
| 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) |  Yes  | 
| E.8.2.2 | Placebo  |  No  | 
| E.8.2.3 | Other |  No  | 
| E.8.2.4 | Number of treatment arms in the trial | 2 | 
| E.8.3 | 
                                The trial involves single site in the Member State concerned
                             |  No  | 
| E.8.4 |  The trial involves multiple sites in the Member State concerned  |  Yes  | 
| E.8.4.1 | Number of sites anticipated in Member State concerned | 4 | 
| E.8.5 | The trial involves multiple Member States |  Yes  | 
| E.8.5.1 | Number of sites anticipated in the EEA | 40 | 
| 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 | 
| Argentina | 
 
| Brazil | 
 
| Canada | 
 
| Chile | 
 
| Czech Republic | 
 
| Denmark | 
 
| France | 
 
| Germany | 
 
| Hungary | 
 
| Israel | 
 
| Italy | 
 
| Japan | 
 
| Latvia | 
 
| Mexico | 
 
| Poland | 
 
| Romania | 
 
| Russian Federation | 
 
| Spain | 
 
| Sweden | 
 
| United Kingdom | 
 
| United States | 
 
 
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| 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
                     | 
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| E.8.9 Initial estimate of the duration of the trial | 
| E.8.9.1 | In the Member State concerned years |  | 
| E.8.9.1 | In the Member State concerned months | 17 | 
| E.8.9.1 | In the Member State concerned days |  | 
| E.8.9.2 | In all countries concerned by the trial months | 26 |