Please select the eligibility criteria that correspond to the clinical trial below.
Title: An Open-label, Multicenter Phase II Extension of Study 28063 (ATAMS) to Obtain Long-term Follow-up Data in Subjects With Relapsing Multiple Sclerosis Treated With Atacicept for up to 5 Years (ATAMS-Extension)
Brief Summary: This study (28851) is a long-term follow-up study of subjects enrolled in ATAMS study 28063 (NCT00642902). The aim of this study is to monitor the safety and tolerability of atacicept administered for up to 5 years to subjects with relapsing multiple sclerosis (RMS).

This extension study consists of two parts. Part A will be double blind and Part B will be open label. During Part A, subjects initially randomized to atacicept will continue to receive the atacicept dose to which they have been randomized in study 28063 (ATAMS) once a week subcutaneously (under the skin). Subjects randomized to placebo in ATAMS will receive atacicept at 150 mg once a week subcutaneously during Part A. Once the results of ATAMS are available and the atacicept dose with the best benefit / risk ratio has been identified, all subjects will be switched to this dose and will continue the extension study open-label (Part B). Throughout the study, subjects and investigators will remain blinded with respect to initial and part A treatment allocation/dose.


Options:
A: Key Inclusion Criteria:

* Multiple Sclerosis (MS) subjects who have a confirmed diagnosis of relapsing-remitting MS according to McDonald criteria #1-4 and a baseline Expanded Disability Status Scale (EDSS) between 0.0 and 5.0, inclusive, who meet either of the following 2 criteria:

  * Have experienced at least 1 relapse within the 12 months prior to randomization, with a cranial magnetic resonance imaging (MRI) demonstrating lesion(s) consistent with MS , OR
  * Show evidence of gadolinium-enhancing lesions of the brain on an MRI performed within the 6 weeks prior to randomization.

Key Exclusion Criteria:

* Diagnosis of primary progressive, secondary progressive, or progressive relapsing MS
* History of malignancy
* History of severe allergic or anaphylactic reactions or known drug hypersensitivity
* History of abnormal laboratory results based on investigator judgment
* History of human immunodeficiency virus (HIV) or other immunodeficient conditions
* History of drug or alcohol abuse within the 2 years prior to randomization
* An MS relapse that has occurred within the 50 days prior to randomization AND/OR the subject has not stabilized from a previous relapse prior to randomization
* Positive screening for active infection with Hepatitis B virus or Hepatitis C virus
* Varicella or herpes zoster virus infection or any severe viral infection within 6 weeks before Screening
* Exposure to varicella zoster virus within 21 days before Screening.
* Abnormal blood tests at Screening: Hemoglobin ≤9.0 g/dL, Platelets ≤100 × 10\^9/L, Lymphocytes ≤1.0 × 10\^9/L, Neutrophils ≤1.5 × 10\^9/L, alanine aminotransferase/serum glutamate pyruvate transaminase (ALT/SGPT), aspartate aminotransferase/serum glutamic oxaloacetic transaminase (AST/SGOT), or gamma-glutamyl-transferase \>2 times the upper limit of normal (ULN) and serum creatinine \>ULN.

NOTE: Other protocol defined Inclusion/Exclusion criteria may apply.
B: Inclusion Criteria:

* Male and female patients between ages 18-55 with a diagnosis of multiple sclerosis
* Patients with a relapsing-remitting disease course
* Patients with EDSS score of 0-5.5

Exclusion Criteria:

* Patients with other chronic disease of the immune system, malignancies, acute pulmonary disease, cardiac failure, etc.
* Pregnant or nursing women

Other protocol-defined inclusion/exclusion criteria applied to this study.
C: Inclusion Criteria:

* Participation in study 28063.
* Completion of Week 36 visit of the core study 28063.
* Willingness and ability to comply with study procedures for the duration of the study.
* Voluntary provision of written informed consent (including, for the USA, subject authorization under the Health Insurance Portability and Accountability Act (HIPAA)), given before any study-related procedure that is not part of normal medical care and with the understanding that the subject may withdraw consent at any time without prejudice to his or her future medical care.

Exclusion Criteria:

* Premature discontinuation of core study 28063.
* Subjects who meet criteria listed below will receive IMP in study 28851:

  * Subjects who are eligible for participation in extension study 28851 but do not meet these criteria will not be treated with IMP but will undergo scheduled visits, irrespective of their treatment.
* All subjects must satisfy the following criteria before Extension Study Day 1 (D1-EXT; defined as the first day of dosing in the extension study) to be eligible for treatment with IMP:

  * Eligibility for participation in extension study 28851.
  * For women of childbearing potential, a negative urine pregnancy test at eligibility assessment.
  * Female subjects of childbearing potential must be willing to avoid pregnancy by using an adequate method of contraception for four (4) weeks before the first dose administered within the extension study, during the study and for twelve (12) weeks after the last dose of trial medication. Adequate contraception is defined as two barrier methods, or one barrier method with spermicide, or an intrauterine device, or use of a combined oral female hormonal contraceptive (or the definitions requested by health authorities and locally amended in the core study 28063). For the purposes of this trial, women of childbearing potential are defined as: "All female subjects after puberty unless they are post-menopausal for at least two years or are surgically sterile" (For Germany Only: Female subjects of childbearing potential must be willing to avoid pregnancy by using highly effective methods of contraception for approximately four (4) weeks prior to D1-EXT, during and for twelve (12) weeks after the last dose of trial medication. This requirement does not apply to surgically sterile subjects or to subjects who are postmenopausal for at least 2 years. Highly effective contraception is defined as any method or combination of methods which result in a low failure rate (i.e. less than (\<) 1% per year) when used consistently and correctly, such as implants, injectables, combined oral contraceptives, sexual abstinence, vasectomized partner, 2 barrier methods, or 1 barrier method with spermicide)
* Willingness and ability to comply with study procedures for the duration of the study.
* To be eligible for treatment with investigational medicinal product (IMP) in study 28851, the subjects must not meet any of the following criteria:
* Non-eligibility for participation in extension study 28851 (premature discontinuation of core study 28063).
* Major protocol violation or non-compliance in the core study.
* Use of prohibited immunomodulatory / immunosuppressive therapies
* Serum immunoglobulin G (IgG) level \<3 gram per liter (g/L) if the subject received atacicept in the core study, or serum IgG level \<6 g/L if the subject received placebo in the core study (to protect the blinding of the core study, the IgG level will be communicated to the treating physician only if it is too low for extension study participation and only after all Week 36 assessments performed within the core study have been completed).
* Any condition, including laboratory findings that, in the opinion of the Investigator, constitutes a risk or a contraindication for participation in the extension study, or that could interfere with the study objectives, conduct or evaluation.
* Known active clinically significant acute or chronic infection, or any major episode of infection requiring hospitalization or treatment with parenteral anti-infectives.
* Investigator judgement that treatment of the subject with atacicept in the extension study is not appropriate.
* Aspartate aminotransferase (AST), or alanine aminotransferase (ALT), or alkaline phosphatase (AP) level greater than (\>)2.5 x upper limit of normal (ULN), or total bilirubin \>1.5 x ULN at eligibility assessment.
* Clinically significant abnormality in any hematological test (e.g. hemoglobin \<100 g/L (6.21 millimoles per liter \[mmol/L\]), white blood cells \<3 x 10\^9 per liter (/L), platelets \<100 x 10\^9/L) at eligibility assessment.
* Clinically significant abnormality on electrocardiogram (ECG) performed at eligibility assessment.
* Presence of uncontrolled or New York Health Association (NYHA) class 3 or 4 congestive heart failure at Week 36 of the core study.
* Moderate to severe renal impairment (creatinine clearance \<50 milliliter per minute (mL/min) according to Cockcroft-Gault equation).
* Allergy or hypersensitivity to gadolinium (Gd).
* Allergy or hypersensitivity to atacicept or to any of the components of the formulated atacicept.
* Diagnosis or family history of Creutzfeldt-Jakob disease (CJD).
D: Inclusion Criteria:

* Signed informed consent form (ICF)
* Age 18 to 55 years (inclusive) as of the date the ICF was signed
* Diagnosis of MS per update of McDonald criteria
* Onset of MS symptoms (as determined by a neurologist; could be retrospectively) within 10 years of the date the ICF was signed
* Expanded Disability Status Scale (EDSS) score 0.0 to 5.0 (inclusive) at Screening
* Greater than or equal to (\>=) 2 MS attacks (first episode or relapse) occurring in the 24 months prior to the date the ICF was signed, with \>=1 attack in the 12 months prior to the date the ICF was signed, with objective neurological signs confirmed by a physician, nurse practitioner, or other Genzyme-approved health-care provider and the objective signs could be identified retrospectively
* \>=1 MS relapse during treatment with a beta interferon therapy or glatiramer acetate after having been on that therapy for \>=6 months within 10 years of the date the ICF was signed
* MRI scan demonstrating white matter lesions attributable to MS and meeting at least 1 of the following criteria, as determined by the neurologist or a radiologist: \>=9 time constant 2 (T2) lesions at least 3 millimeter (mm) in any axis; a gadolinium- (Gd-) enhancing lesion at least 3 mm in any axis plus \>=1 brain T2 lesions; and a spinal cord lesion consistent with MS plus \>=1 brain T2 lesion

Exclusion Criteria:

* Received prior therapy with alemtuzumab
* Current participation in another clinical study or previous participation in CAMMS323 (Comparison of Alemtuzumab and Rebif Efficacy in Multiple Sclerosis, CARE-MS I)
* Treatment with natalizumab, methotrexate, azathioprine, or cyclosporine in the past 6 months. Participants who received one of these medications more than 6 months before the date the ICF was signed were eligible for study entry if approval was granted by Genzyme
* Any progressive form of MS
* History of malignancy (except basal skin cell carcinoma)
* CD4 +, CD8 +, CD19 + (that is, absolute CD3 + CD4 + , CD3 + CD8 + , or CD19 + /mm 3 ) count, absolute neutrophil count less than (\<) lower limit of normal (LLN) at screening; if abnormal cell count(s) returned to within normal limits (WNL), eligibility could be reassessed
* Known bleeding disorder (for example, dysfibrinogenemia, factor IX deficiency, hemophilia, Von Willebrand's disease, disseminated intravascular coagulation, fibrinogen deficiency, or clotting factor deficiency)
* Significant autoimmune disease including but not limited to immune cytopenias, rheumatoid arthritis, systemic lupus erythematosus, other connective tissue disorders, vasculitis, inflammatory bowel disease, severe psoriasis
* Presence of anti-thyroid stimulating hormone (TSH) receptor (TSHR) antibodies (that is, above the LLN)
* Active infection or at high risk for infection

Answer: C