To study the long-term safety and efficacy of BCD-148 in patients with paroxysmal nocturnal hemoglobinuria (PNH), previously treated in clinical study (CS) BCD-148-2/NOCTURN

The clinical study BCD-148-EXT was an extension of a multicenter, randomized, open-label, comparative study of the efficacy and safety of BCD-148 in PNH patients versus SOLIRIS® (BCD-148-2/NOCTURN).

Clinical study BCD-148-EXT is a Phase III study extension conducted after completion of BCD-148 900 mg therapy or SOLIRIS® 900 mg by subjects of clinical study BCD-148-2/NOCTURN.

In the BCD-148-EXT clinical study patients continued BCD-148 maintenance therapy for 105 weeks.

The BCD-148-EXT study consisted of two periods: screening period (not more than 7 days inclusive, i.e. 1 week from signing the patient information sheet and IC form) and the treatment period (Weeks 0 to 105 of the study, inclusive). As part of the treatment period, patients received intravenous infusions of the investigational drug BCD-148 in the maintenance therapy regimen.

Inclusion Criteria:

1. Signed IC form for participation in the study.
2. Indications for pathogenesis-based therapy of PNH with an anti-C5 monoclonal antibody (eculizumab).
3. Consent for revaccination against Neisseria meningitidis .
4. Negative pregnancy test for urine human chorionic gonadotropin (HCG) in women at enrollment in study BCD-148-EXT (the test was not performed in women who have been postmenopausal for at least 2 years, or in surgically sterile subjects) .
5. Willingness of patients and their sexual partners of childbearing potential to use reliable contraceptive measures from signing the IC form throughout the study and for 4 weeks after the last drug dosing in the clinical study. This requirement did not apply to patients who underwent surgical sterilization and women who have been postmenopausal for over 2 years. Reliable methods of contraception included the use by partners of one barrier method in combination with one of the following: spermicides, intrauterine device, oral contraceptives (for female partners of male subjects only, for female study participants - upon agreement with the Sponsor and with justification by the investigator) .
6. The ability of the patient to comply with the Protocol requirements, in the Investigator's opinion.

Exclusion Criteria:

1. Patient withdrawal from clinical study BCD-148-2/NOCTURN until its completion for any reason.
2. Pregnancy or breastfeeding, or planning of pregnancy by a female participant/planning conceiving a child by a male participant during the clinical study.
3. Any conditions that, in the investigator's opinion, could increase the patient's risk associated with participation in the study or could affect the assessment of the study results.
4. Hypersensitivity to BCD-148 components, murine proteins, and other components of the products according to the patient's history; hypersensitivity to any component of the meningococcal vaccine.
5. Known alcohol or drug addiction, or signs of alcohol/drug addiction, which, according to the investigator, were a contraindication for the treatment with the study drug or limited the treatment compliance.