A Study of Bermekimab in Patients With Hidradenitis Suppurativa

Phase 2, open label study of bermekimab in patients with moderate to severe Hidradenitis
Suppurativa. The study is multicenter and will consist of two patient groups, each of which
will receive a total of 13 X 400mg weekly subcutaneous injections of bermekimab: Group A
(n=10) patients who have failed anti-TNF therapy, and Group B (n=10) patients who have had no
prior treatment with biological agents that block TNF.

Patients will be followed for 13 weeks to allow for assessment of safety and preliminary
efficacy.

Additionally, patients who had received the 200 mg weekly subcutaneous injections of
bermekimab under the previous version of this protocol are eligible to begin receiving the
400 mg dose starting with his/her next scheduled visit, and for the remainder of his/her
treatment plan.

Inclusion Criteria:

- Written informed consent provided by the patient.

- Male or female, age 18 years or greater.

- For group A, patients must have received and failed anti-TNF therapy.

- For Group B, patients must not have received any prior treatment with any
anti-TNF therapy.

- Patients who have received 200 mg dose of bermekimab in this study (previous
version(s)) are eligible to begin receiving 400 mg dose starting with the
patient's next scheduled visit for the remainder of his/her treatment plan.

- Diagnosis of HS for at least 1 year prior to screening.

- HS affecting at least two distinct anatomic areas, one of which is Hurley II or III
stage.

- A total body count of abscesses and inflammatory nodules (AN) of at least 3

- Full understanding of the procedures of the study protocol and willingness to comply
with them.

- In case of female patients of childbearing potential, willingness to use one method of
contraception of high efficacy during the entire study period. This method can be
intake of hormonal contraceptives or the use of one of the following: condoms,
diaphragm or an intrauterine device. Women of non-childbearing potential include those
considered to have a medical history that indicates that pregnancy is not a reasonable
risk, including post-menopausal women and those with a history of hysterectomy.

Exclusion Criteria:

- Age below 18 years.

- Receipt of oral antibiotic treatment for HS within 28 days prior to screening.

- Receipt of prescription topical therapies for the treatment of HS within 14 days prior
to screening, and/or systemic therapies for HS (immunosuppressants, corticosteroids,
retinoids, or hormonal therapies) within 28 days prior to screening.

- History of treatment with bermekimab for any reason, EXCEPT patients previously
treated with 200 mg bermekimab dose in the previous version(s) of this study.

- History of severe allergic or anaphylactic reactions to human, humanized, chimeric, or
murine monoclonal antibodies.

- Has received a live (attenuated) vaccine over the 4 weeks prior to screening.

- New intake of opioid analgesics starting within 14 days prior to screening.

- Major surgery (requiring general anesthesia or respiratory assistance) within 28 days
prior to Visit 1, Day 0 of start of study drug.

- Hepatic dysfunction defined as any value of transaminases or of γ-glutamyl
transpeptidase (γGT), or of total bilirubin > 3 x upper normal limit

- Stage C Child-Pugh liver cirrhosis.

- Chronic infection by the human immunodeficiency virus (HIV), hepatitis B virus (HBV)
and/or hepatitis C virus (HCV).

- Neutropenia defined as <1,000 neutrophils/mm3.

- Pregnancy or lactation.