QingYan Guan

University of Washington Seattle, Seattle, Washington, United States

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Publications (2)6.5 Total impact

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    ABSTRACT: The purpose of the study was to determine the long-term safety and effectiveness of high-dose immunosuppressive therapy (HDIT) followed by autologous hematopoietic cell transplantation (AHCT) in advanced multiple sclerosis (MS). TBI, CY and antithymocyte globulin were followed by transplantation of autologous, CD34-selected PBSCs. Neurological examinations, brain magnetic resonance imaging and cerebrospinal fluid (CSF) for oligoclonal bands (OCB) were serially evaluated. Patients (n=26, mean Expanded Disability Status Scale (EDSS)=7.0, 17 secondary progressive, 8 primary progressive, 1 relapsing/remitting) were followed for a median of 48 months after HDIT followed by AHCT. The 72-month probability of worsening 1.0 EDSS point was 0.52 (95% confidence interval, 0.30-0.75). Five patients had an EDSS at baseline of 6.0; four of them had not failed treatment at last study visit. OCB in CSF persisted with minor changes in the banding pattern. Four new or enhancing lesions were seen on MRI, all within 13 months of treatment. In this population with high baseline EDSS, a significant proportion of patients with advanced MS remained stable for as long as 7 years after transplant. Non-inflammatory events may have contributed to neurological worsening after treatment. HDIT/AHCT may be more effective in patients with less advanced relapsing/remitting MS.
    Bone marrow transplantation 11/2011; 47(7):946-51. DOI:10.1038/bmt.2011.208 · 3.57 Impact Factor
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    ABSTRACT: The symptoms of Chiari I Malformation (CIM) and fibromyalgia (FM) overlap. Some FM patients have been surgically treated for presumed CIM-type pathology. To determine whether CIM is more common among FM patients than pain- and fatigue-free controls. One hundred seventy-six participants with FM and 67 pain- and fatigue-free control subjects underwent magnetic resonance imaging of the brain and upper cervical spine. Posterior fossa cerebrospinal fluid flow was assessed with cardiac gated cine phase-contrast imaging at the craniocervical region. CIM was defined as inferior extension of cerebellar tonsils ≥ 5 mm below the basion-opisthion line of the foramen magnum or tonsillar position 3 to 5 mm below the basion-opisthion line plus abnormalities of CSF flow, posterior fossa volume, or hindbrain or cervical spinal cord movement. Visual analog scales, questionnaires, and interviews were used to collect data on sleep quality, fatigue, pain, and headache. We used regression techniques to examine the association of outcome measures with disease status and the Fisher exact test to compare the CIM prevalence in the 2 groups. The FM group was older (mean age, 50 vs 40 years) and more likely to be white (89% vs 73%) and female (93% vs 54%; P < .01). Mean tonsillar position and the prevalence of CIM (2.8% vs 4.5%; P = .69) were similar in the FM and control groups. FM patients experienced more headaches, pain, fatigue, and sleep disturbances than control subjects (P < .01). Most patients with FM do not have CIM pathology. Future studies should focus on dynamic neuroimaging of craniocervical neuroanatomy in patients with FM.
    Neurosurgery 11/2010; 68(2):443-8; discussion 448-9. DOI:10.1227/NEU.0b013e3182039a31 · 3.62 Impact Factor

Publication Stats

15 Citations
6.50 Total Impact Points


  • 2010–2011
    • University of Washington Seattle
      • Department of Radiology
      Seattle, Washington, United States