Study of RC18 Administered Subcutaneously to Subjects With Systemic Lupus Erythematosus(SLE)

Inclusion criteria

• Active SLE disease，and at least according with 4 of the 11 items of the American College of Rheumatology (ACR) criteria 1997.
• Age & Gender: Male or female between 18 and 65 years of age inclusive，and the sex ratio is not limited
• Signed informed consent form，willing or able to participate in all required study evaluations and procedures.
• SELENA-SLEDAI(Safety of Estrogens in Lupus Erythematosus National Assessment SLE Disease Activity Index) score ≥ 8 during the screening period.and if there is hypocomlement or the Anti-dsDNA score, SELENA-SLEDAI disease activity score should be at least 6 at screening .
• Autoantibody-positive
• on a stable SLE treatment regimen for at least 30 days prior to Day 1, which consisted of any of the following (alone or in combination): cortical hormone,anti-malarials,non-steroidal anti inflammatory drugs (NSAIDs),or any immunosuppressive and immunomodulator therapy(i.e.,azathioprine,mycophenolate ,cyclophosphamide,methotrexate,leflunomide, Tacrolimus ,ciclosporin ).

Exclusion criteria

• Severe lupus nephritis within two months(designed as:Urine protein>6g/24h or serum creatinine ( SCr）>2.5mg/dL or 221umol/L ) or needing for hemodialysis or recepting high dose cortical hormone ≥14 days( metacortandracin>100mg/d or equivalent)
• Central nervous system disease caused by SLE or non SLE within two months (including epilepsy， mental disease，organic encephalopathy syndrome，cerebrovascular accident, encephalitis, central nervous system vasculitis）;
• there are serious heart, liver, kidney and other important organs and blood, endocrine system diseases and medical history;

Evaluation criteria for severity :

• Alanine aminotransferase（ALT）or aspartate aminotransferase (AST) ≥2 upper limit of normal (ULN);
• Creatinine Clearance (Ccr)<30ml/min;
• White Blood Cell Count(WBCs)<2.5x 10(9)/L;
• hemoglobin<85g/L;
• Platelets<50x 10(9)/L.

• Have a historically active hepatitis or active hepatitis or medical history,hepatitis B :Patients with positive HBsAg are excluded.;Hepatitis C: Patients with hepatitis C antibody positive are excluded;
• Immune deficiency, uncontrolled severe infection and patients with active or recurrent peptic ulcer;
• Pregnant , lactating women and men or women who have birth plans in the past 12 months ;
• Have a history of allergic reaction to human biological medicines.
• Receipt of live vaccine within 1 month;
• Have participated in any clinical trial in the first 28 days of the initial screening or 5 times half-life period of the study compound (taking the time for the elderly).
• Have received treatment with B cell targeted therapy such as Rituximab or Epratuzumab etc.
• Receipt of anti-tumor necrosis factor、interleukin receptor antagonist；
• Receipt of IV immunoglobulin（IVIG）,prednisone>100mg/d more than 14 days or plasma exchange;
• There are active infections (such as herpes zoster, human immunodeficiency virus (HIV) virus infection, active tuberculosis, etc.) during the screening period;
• Patients have depression or the significant suicide ideation;
• Investigator considers candidates not appropriating for the study.