A Study In Adults With Moderate To Severe Dermatomyositis

Inclusion Criteria:

- Must have CDASI Activity score of greater than or equal to 14, and have failed at
least 1 standard of care systemic treatment, (eg, corticosteroids).

- Confirmation of DM by the investigator and two of the following:

1. Gottron's papules;

2. Gottron's sign;

3. Heliotrope eruption;

4. Nailfold changes, (dilated capillary loops, capillary dropout, cuticular
hypertrophy and/or rugged cuticles;

5. Photodistributed violaceous erythema, (skin that is exposed to sunlight and
appears purplish/reddish, and patchy in appearance;

6. Positive DM serology -

- Post DM diagnosis; standard of care workup for DM must have been completed prior to
entry into this research study.

- Willing to provide 6 biopsies during the course of the research study

Exclusion Criteria:

- Investigator site staff or members of their family.

- Acute and Chronic present medical conditions

- Intake of greater than 15 mg of prednisone or equivalent per day

- Pregnant or breastfeeding females. Fertile men and women who will not comply with the
use of 2 effective birth control methods as per the research protocol

- Have required management of acute or chronic infections

- Have pre existing demyelinating disorder such as multiple sclerosis, or other severe
neurological deficits.

- Clinically significant lab abnormalities

- Any health condition that may be worsened by immunosuppression