Proof of Biological Activity of SAR100842 in Systemic Sclerosis

Core part: randomized, double-blind, placebo-controlled study - 8-week treatment Extension
part for participants completing the core part: Open label non-controlled study - 16-week
treatment

Each patient's participation in the study will be approximately 13 or 33 weeks depending on
their participation in the extension part: up to 2 weeks of screening, 8 weeks of treatment
in the core part, 1 to 30 days wash-out between core part and extension part , 16 weeks of
treatment in the extension part and 3 weeks of follow up.

Inclusion criteria :

- Patients who meet the American College of Rheumatology (ACR) criteria for systemic
sclerosis with diffuse cutaneous involvement and <36 months since the onset of the first
systemic sclerosis manifestation other than Raynaud's phenomenon and have a Modified
Rodnan Skin Score (mRSS) ≥ 15 and an area of definite involvement of the dorsal forearm
that is considered amenable to repeated 4mm skin biopsies.

Exclusion criteria:

1. Patients with high dose or unstable low dose immunosuppressive drugs, cytotoxic,
anti-fibrotic or glucocorticoids drugs at least 4 weeks prior to screening

2. Serum creatinine > 2.0 mg/dL

3. Gastrointestinal involvement preventing oral administration of study drug

4. Severe cardiac and/or pulmonary disease

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