Objectives: To assess the safety and efficacy of high-dose immunosuppression and autologous peripheral blood cell transplantation (APBSCT) in severe and refractory primary Sjögren's syndrome (pSS) and to analyze immune reconstitution in pSS.
Methods: Two patients with severe and refractory primary pSS were included in this study. They suffered still with active pSS despite the use of prednisone and immunosuppression agents. A regimen of high-dose immunosuppression and APBSCT was carried out for them. Dynamic T cell subgroup was tested with flow cytometry before and after PBSCT and the diversity of T cell receptor repertoire and CDR3 spectrum with RT-PCR and genescan.
Results: Both of the pSS cases underwent PBSCT smoothly. Clinical assessments showed improvement. Immune reconstruction lagged behind hematopoietic reconstitution. The skew of T cell receptor repertoire was somewhat corrected and CDR3 spectrum changed from oligoclonality to poly-clonality.
Conclusion: High dose chemotherapy (HDC) and APBSCT are feasible and safe and can result in short-term or middle-term improvement of disease in patients with severe pSS which is refractory to conventional treatment. It is observed in this study that immune reconstruction recovered 3 moths after the treatment. Long-term efficacy of HDC + PBSCT in pSS should be studied in large number of cases with follow up of longer time.