A Study of Navenibart (STAR-0215) in Participants With Hereditary Angioedema

An adverse event was any untoward medical occurrence in a clinical investigation participant who was administered a pharmaceutical product that did not necessarily have a causal relationship with the treatment. A treatment-emergent adverse event was defined as any adverse event with an onset at the time of or following the start of treatment with study drug, or medical conditions present before the start of treatment that increased in severity or relationship at the time of or following the start of treatment. A summary of all Serious Adverse Events and Other Adverse Events (nonserious) regardless of causality is located in the 'Reported Adverse Events' section.

An attack was considered an HAE attack if at least 1 of the following criteria was met (per the investigator): peripheral angioedema (cutaneous swelling involving an extremity, the face, neck, torso, and/or genitourinary region); abdominal angioedema (abdominal pain, with or without abdominal distention, nausea, vomiting, or diarrhea); laryngeal angioedema (stridor, dyspnea, difficulty speaking, difficulty swallowing, throat tightening, or swelling of the tongue, palate, uvula, or larynx). The HAE attack rate was the number of unique investigator-confirmed HAE attacks per month.

An attack was considered an HAE attack if at least 1 of the following criteria was met (per the investigator): peripheral angioedema (cutaneous swelling involving an extremity, the face, neck, torso, and/or genitourinary region); abdominal angioedema (abdominal pain, with or without abdominal distention, nausea, vomiting, or diarrhea); laryngeal angioedema (stridor, dyspnea, difficulty speaking, difficulty swallowing, throat tightening, or swelling of the tongue, palate, uvula, or larynx).

An attack was considered an HAE attack if at least 1 of the following criteria was met (per the investigator): peripheral angioedema (cutaneous swelling involving an extremity, the face, neck, torso, and/or genitourinary region); abdominal angioedema (abdominal pain, with or without abdominal distention, nausea, vomiting, or diarrhea); laryngeal angioedema (stridor, dyspnea, difficulty speaking, difficulty swallowing, throat tightening, or swelling of the tongue, palate, uvula, or larynx). All HAE attacks were classified by the investigator according to severity: mild (transient or mild discomfort); moderate (mild to moderate limitation in activity, some assistance with daily activities needed); severe (marked limitation in activity, assistance with daily activities required).

An attack was considered an HAE attack if at least 1 of the following criteria was met (per the investigator): peripheral angioedema (cutaneous swelling involving an extremity, the face, neck, torso, and/or genitourinary region); abdominal angioedema (abdominal pain, with or without abdominal distention, nausea, vomiting, or diarrhea); laryngeal angioedema (stridor, dyspnea, difficulty speaking, difficulty swallowing, throat tightening, or swelling of the tongue, palate, uvula, or larynx).

An attack was considered an HAE attack if at least 1 of the following criteria was met (per the investigator): peripheral angioedema (cutaneous swelling involving an extremity, the face, neck, torso, and/or genitourinary region); abdominal angioedema (abdominal pain, with or without abdominal distention, nausea, vomiting, or diarrhea); laryngeal angioedema (stridor, dyspnea, difficulty speaking, difficulty swallowing, throat tightening, or swelling of the tongue, palate, uvula, or larynx).

An attack was considered an HAE attack if at least 1 of the following criteria was met (per the investigator): peripheral angioedema (cutaneous swelling involving an extremity, the face, neck, torso, and/or genitourinary region); abdominal angioedema (abdominal pain, with or without abdominal distention, nausea, vomiting, or diarrhea); laryngeal angioedema (stridor, dyspnea, difficulty speaking, difficulty swallowing, throat tightening, or swelling of the tongue, palate, uvula, or larynx). The time to first HAE attack was calculated by: ([First HAE attack or censor date] - First Treatment date) +1. If a participant did not have an HAE attack, they were censored to the end of study date.

An attack was considered an HAE attack if at least 1 of the following criteria was met (per the investigator): peripheral angioedema (cutaneous swelling involving an extremity, the face, neck, torso, and/or genitourinary region); abdominal angioedema (abdominal pain, with or without abdominal distention, nausea, vomiting, or diarrhea); laryngeal angioedema (stridor, dyspnea, difficulty speaking, difficulty swallowing, throat tightening, or swelling of the tongue, palate, uvula, or larynx). The proportion of HAE attack-free days was calculated by: (the number of HAE attack-free days/duration of evaluation period in days).

Blood samples were collected at designated timepoints to measure the Cmax of navenibart. Results reported as micrograms/milliliter (mcg/mL).

Blood samples were collected to measure the plasma levels of cHMWK (a measure of plasma kallikrein activity). Results reported as percent change in percentage cHMWK (%cHMWK). A decrease in %cHMWK is reflective of the pharmacodynamic activity of navenibart.

Blood samples were collected at designated timepoints to assess the formation of navenibart ADAs in serum.