A Study Comparing the Efficacy and Safety of the Morning Injection of Toujeo Versus Lantus in Patients With Type 1 Diabetes Mellitus

The maximum study duration per participant was to be of approximately 20 weeks that consisted
of an up to a 4-week screening and CGM training period including a 1-2 week baseline
(blinded) CGM performance (allowed for re-training), a 14-week open-label, comparative
treatment period allowing for dose titration in both basal and meal-time insulin and
including a 1-2 week end-of treatment blinded CGM collection with fixed dose of HOE901-U300
and Lantus, and a 2 day post treatment follow-up period.

Inclusion criteria:

- Adult participants (male and female) with type 1 diabetes mellitus (T1DM).

- Signed written informed consent.

Exclusion criteria:

- Age <18 years or >70 years.

- Fasting c-peptide ≥0.3 nmol/L as per source document or central lab test at Visit 1.

- Glycated hemoglobin (HbA1c) ≤ 6.5 % or ≥ 10.0% via central lab test at Visit 1.

- Participants who experienced none of episode of documented symptomatic and/or severe
hypoglycemia (as per the American Diabetes Association (ADA) classification) during
the past month prior to screening.

- Participants who experienced >1 episode of severe hypoglycemia resulting in
coma/seizures during the last 12 months before screening.

- Participants received less than 1 year treatment with basal plus mealtime insulin.

- Used any basal insulins other than long-acting insulin analogs (ie, Lantus, Toujeo,
Levemir, and Tresiba) in the past 3 months before screening.

- Required >80 U/day basal insulin analogs or not on stable dose (±20% total dose)
within 30 days prior to screening.

- Used fewer than 2 injections of rapid-acting insulin analog per day within 30 days
prior to screening.

- Used human regular insulin as mealtime insulin within 30 days prior to screening.

- Used an insulin pump during the last 6 months before screening.

- History of unstable proliferative diabetic retinopathy or any other rapidly
progressive diabetic retinopathy or macular edema likely to required treatment (e.g.,
laser, surgical treatment, or injectable drugs) during the study period.

- Pregnant or breast-feeding women or planned pregnancy during the duration of the
study.

- Use of any other investigational drug(s) within 1 month or 5 half-lives, whichever was
longer prior to screening.

- Inappropriate CGM use during screening period evidenced by failure to obtain a minimum
of 4 days of usable records by the end of screening.

- Noncompliance with self-monitored plasma glucose (SMPG) performance evidenced by
failure to demonstrate at least 5 days of 5 point SMPG records by the end of
screening.

The above information is not intended to contain all considerations relevant to a
participants's potential participation in a clinical trial.