AlloNK®, an Allogeneic Non-genetically Modified, Cord Blood-derived NK Cell Therapy, in Combination With Rituximab, Studied in Relapsing Forms of B-cell Dependent Rheumatologic Diseases.

For Subjects with Refractory Rheumatoid Arthritis (RA):

* Documented diagnosis of RA, meeting the 2010 ACR/EULAR classification criteria.
* Rheumatoid Factor (RF) or Anti Citrullinated Protein Antibody (ACPA) positive.
* High-sensitivity C-reactive protein (hs-CRP) \> 3 mg/L or Erythrocyte Sedimentation Rate (ESR) \> 28 mm/hr.
* Have had prior treatment for a period of at least 12 weeks with a biologic disease modifying anti-rheumatic drug and were deemed refractory by the treating physician.
* Minimum of six swollen joint counts (SJC) and six tender joint counts (TJC) according to joint assessment.

For subjects with Sjögren's Disease (SjD)

* Prior diagnosis of Primary SjD as per 2016 ACR/EULAR criteria with confirmatory diagnosis in the 24 weeks preceding screening.
* Total Clinical European League Against Rheumatism Sjogren's Syndrome Disease Activity Index (clinESSDAI) \> 6.
* Salivary Flow Rate \> 0.1 mL/min on stimulation.

For subjects with Idiopathic Inflammatory Myopathies (IIMs)

* Presence of a positive autoantibody (ANA \>1:80 or RNP or SSA/SSB or other myositis specific autoantibodies.
* Refractory IIM as defined by inadequate response/intolerance to at least 3 months of glucocorticoids and/or at least one other immunosuppressive.
* Muscle biopsy or muscle MRI to confirm IIM diagnosis, where applicable, within 12 months prior to enrollment.

For Subjects with Systemic Sclerosis (SSc)

* Diagnosis of SSc in accordance with the ACR/EULAR 2013 classification.
* Modified Rodnan skin score (mRSS) \> 10.
* Initial confirmatory diagnosis within 8 years of screening.
* Refractory SSc as defined by inadequate response/intolerance to at least 3 months of glucocorticoids and/or at least one other immunosuppressive.