Please select the eligibility criteria that correspond to the clinical trial below.
Title: A Double-blind, Randomized, Placebo-controlled, Cross-over Study to Evaluate the Clinical Efficacy and Safety of Subcutaneous Administration of Human Plasma-derived C1-esterase Inhibitor in the Prophylactic Treatment of Hereditary Angioedema
Brief Summary: The aim of this study is to assess the efficacy of C1-esterase inhibitor in preventing hereditary angioedema attacks when it is administered under the skin of subjects with hereditary angioedema. The safety of C1-esterase inhibitor will also be assessed. Each subject will enter a run-in period of up to 8-weeks. Subjects who complete the run-in period and who are eligible will then enter the treatment phase which comprises two sequential treatment periods. In the treatment phase, subjects will be randomized to one of four arms consisting of treatment with low- or higher-volume C1-esterase inhibitor in one treatment period and treatment with low- or higher-volume placebo in the other treatment period. The study will measure the number of hereditary angioedema attacks that subjects experience while receiving each treatment.


Options:
A: Inclusion Criteria:

Run-In Period Inclusion Criteria:

* Males or females aged 12 years or older.
* A clinical diagnosis of hereditary angioedema type I or II.
* Hereditary angioedema attacks over a consecutive 2-month period that required acute treatment, medical attention, or caused significant functional impairment.
* For subjects who have used oral therapy for prophylaxis against HAE attacks within 3 months of Screening: use of a stable regimen within 3 months of Screening, with no plans to change.

Eligibility Criteria for Entering Treatment Period 1:

* Laboratory confirmation of type I or type II hereditary angioedema, including C1-esterase inhibitor functional activity less than 50% AND C4 antigen level below the laboratory reference range.
* No clinically significant abnormalities as assessed using laboratory parameters.
* During participation in the run-in period, subjects must have experienced hereditary angioedema attacks that required acute treatment, required medical attention, or caused significant functional impairment.

Exclusion Criteria:

Run-In Period Exclusion Criteria:

* History of clinical significant arterial or venous thrombosis, or current history of a clinically significant prothrombotic risk.
* Incurable malignancies at screening.
* Any clinical condition that will interfere with the evaluation of C1-esterase inhibitor therapy.
* Clinically significant history of poor response to C1-esterase therapy for the management of hereditary angioedema.
* Receiving therapy prohibited by the protocol, including medications for hereditary angioedema prophylaxis.
* Female subjects who started taking or changed dose of any hormonal contraceptive regimen or hormone replacement therapy (i.e., estrogen/progesterone-containing products) within 3 months prior to the screening visit.
B: Inclusion Criteria:

This study was open to all subjects who:

* Completed participation in LEVP2005-1/A (NCT00289211) and were not participating in LEVP2005-1/B (NCT01005888), any time after the 3-day telephone follow-up
* Completed participation in LEVP2005-1/B any time after the final prophylactic therapy in Part B
* Were enrolled but not randomized in LEVP2005-1/A after Part A was closed
* Were excluded from LEVP2005-1 for any of the following reasons:

  * Pregnancy or lactation
  * Age less than 6 years
  * Narcotic addiction
  * Presence of anti-C1INH autoantibodies
* Were not enrolled in LEVP2005-1 after enrollment in LEVP2005-1 was closed, under the following circumstances:

  * Had a diagnosis of HAE: evidence of a low C4 level plus either a low C1INH antigenic level or a low C1INH functional level, or
  * Had a known HAE-causing C1INH mutation, or
  * Had a diagnosis of HAE based on a strong family history of HAE as determined by the principal investigator

Exclusion Criteria:

* History of allergic reaction to C1INH or other blood products
* Participated in any other investigational drug study within the past 30 days
* Received blood or a blood product in the past 60 days other than C1INH-nf
C: Key Inclusion Criteria:

* A clinical diagnosis of hereditary angioedema (HAE) Type 1 or Type 2, defined as having a C1-INH functional level and a C4 level below the lower limit of the normal (LLN) reference range, as assessed during the Screening period.
* Access to and ability to use one or more acute medications approved by the relevant competent authority for the treatment of acute attacks of HAE
* Subjects must be medically appropriate for on-demand treatment as the sole medicinal management for their HAE during the study.
* Subjects must have a specified number of expert-confirmed attacks during the run-in period of 56 days from the Screening visit.
* Acceptable effective contraception
* Written informed consent

Key Exclusion Criteria:

* Pregnancy or breast-feeding
* Any clinically significant medical condition or medical history that, in the opinion of the Investigator or Sponsor, would interfere with the subject's safety or ability to participate in the study
* Any laboratory parameter abnormality that, in the opinion of the Investigator, is clinically significant and relevant for this study
* Severe hypersensitivity to multiple medicinal products or severe hypersensitivity/ anaphylaxis with unclear etiology
* Use of C1-INH within 14 days or use of androgens or tranexamic acid within 28 days prior to the Screening visit for prophylaxis of HAE attacks, or initiation of these drugs during the study
* Current participation in any other investigational drug study or received another investigational drug within 30 days of the Screening visit
* Prior enrollment in a BCX7353 study
D: Key Inclusion Criteria:

* A clinical diagnosis of hereditary angioedema Type 1 or Type 2, defined as having a C1-INH functional level and a C4 level below the lower limit of the normal (LLN) reference range, as assessed during the Screening period.
* Subject weight of ≥ 40 kg
* Access to and ability to use one or more acute medications approved by the relevant competent authority for the treatment of acute attacks of HAE
* Subjects must be medically appropriate for on-demand treatment as the sole medicinal management for their HAE during the study.
* Subjects must have a specified number of investigator-confirmed attacks during the run-in period of a maximum of 56 days from the Screening visit.
* Acceptable effective contraception
* Written informed consent

Key Exclusion Criteria:

* Pregnancy or breast-feeding
* Any clinically significant medical condition or medical history that, in the opinion of the Investigator or Sponsor, would interfere with the subject's safety or ability to participate in the study
* Any laboratory parameter abnormality that, in the opinion of the Investigator, is clinically significant and relevant for this study
* Severe hypersensitivity to multiple medicinal products or severe hypersensitivity/ anaphylaxis with unclear etiology
* Use of C1-INH within 14 days or use of androgens or tranexamic acid within 28 days prior to the Screening visit for prophylaxis of HAE attacks, or initiation of these drugs during the study
* Current participation in any other investigational drug study or received another investigational drug within 30 days of the Screening visit
* Prior enrollment in a BCX7353 study

Answer: A