Dose Ranging Study to Evaluate the Efficacy and Safety of SAR153191 (REGN88) in Patients With Ankylosing Spondylitis

Primary objective: \- to evaluate the efficacy of Sarilumab in participants with Ankylosing Spondylitis (AS) using the assessment in AS working group criteria (ASAS) 20% response criteria (ASAS20) Secondary objectives: * to demonstrate that Sarilumab was effective on: * assessment of higher level of response \[ASAS 40% response criteria (ASAS40)\] * partial remission * disease activity * range of motion * Magnetic Resonance Imaging (MRI) of the spine * to assess the safety and tolerability of Sarilumab in participants with AS as well as the pharmacokinetic profile of Sarilumab in participants with AS