Trial Outcomes & Findings for Study to Evaluate the Efficacy, Safety, Pharmacokinetics, and Pharmacodynamics of Satralizumab in Participants With Thyroid Eye Disease (NCT NCT05987423)

A total of 131 participants with moderate-to-severe active and chronic inactive thyroid eye disease (TED) took part in the study at 45 investigative sites across 10 countries. Data up to the primary clinical cut-off date (CCOD) have been presented here. Participant flow will be updated 1 year after the study completion date.

Participants were randomized in a 1:1 ratio to receive either subcutaneous (SC) satralizumab or a matching placebo in Part I (Weeks 1-24). After Part I analysis, proptosis responders were re-randomized to satralizumab or placebo, and proptosis non-responders received satralizumab in Part II. The data for Part II will be presented 1 year after the study completion date.

Study to Evaluate the Efficacy, Safety, Pharmacokinetics, and Pharmacodynamics of Satralizumab in Participants With Thyroid Eye Disease

Percentage of participants in the active TED population (i.e., participants who have active disease) who achieved a ≥ 2 mm reduction in proptosis from baseline (Day 1) to Week 24 in the study eye, with no corresponding deterioration of proptosis (≥ 2 mm increase) in the fellow eye has been reported. Percentages have been rounded off.

Percentage of participants in the overall population (i.e., participants with active and chronic inactive TED) who achieved a ≥ 2 mm reduction in proptosis from baseline (Day 1) to Week 24 in the study eye, with no corresponding deterioration of proptosis (≥ 2 mm increase) in the fellow eye has been reported. Percentages have been rounded off.

Diplopia grade was assessed with the use of the Gorman subjective diplopia score (range: 0-3 points), which included: no diplopia (absent, scored as 0), diplopia in the primary position of gaze when the participant is tired or awakening (intermittent, scored as 1), diplopia at extremes of gaze (inconstant, scored as 2), and continuous diplopia in the primary or reading position (constant, scored as 3). Participants with active TED with diplopia present at baseline who had Grade ≥1 reduction or improvement at Week 24 have been reported. Percentages have been rounded off.

Diplopia grade was assessed with the use of the Gorman subjective diplopia score (range: 0-3 points), which included: no diplopia (absent, scored as 0), diplopia in the primary position of gaze when the participant is tired or awakening (intermittent, scored as 1), diplopia at extremes of gaze (inconstant, scored as 2), and continuous diplopia in the primary or reading position (constant, scored as 3). Participants with active and chronic inactive TED with diplopia present at baseline who had Grade ≥1 reduction or improvement at Week 24 have been reported. Percentages have been rounded off.

Percentages have been rounded off.

Percentages have been rounded off.

The GO-QoL is a 16-item self-administered questionnaire divided into two sub-scales and used to assess the perceived effects of TED by the participants on their: 1) Visual Functioning (questions 1-8); and 2) Appearance (questions 9-16). Both subscales and overall score (sum of scores from all 16 questions) are transformed to a scale of 0 to 100. Higher total scores indicate better QoL. Percentages have been rounded off.

The GO-QoL is a 16-item self-administered questionnaire divided into two sub-scales and used to assess the perceived effects of TED by the participants on their: 1) Visual Functioning (questions 1-8); and 2) Appearance (questions 9-16). Both subscales and overall score (sum of scores from all 16 questions) are transformed to a scale of 0 to 100. Higher total scores indicate better QoL. Percentages have been rounded off.

Overall Response was defined as a ≥ 2-point reduction in clinical activity score (CAS), and a ≥ 2 mm reduction in proptosis from baseline in the study eye, provided there is no corresponding deterioration in CAS or proptosis (≥ 2-point/mm increase) in the fellow eye. The CAS is a 7-item description of clinical activity, including: 1. Spontaneous orbital pain; 2. Gaze evoked orbital pain; 3. Eyelid swelling that is considered to be due to TED; 4. Eyelid erythema; 5. Conjunctival redness that is considered to be due to active TED (ignore "equivocal" redness); 6. Chemosis; 7. Swelling of caruncle or plica. Each item is scored as 1 (present) or 0 (absent) and scores for each item are summed for total score of 0 (no inflammatory symptoms) to 7 (most inflammatory symptoms). Higher scores indicate worse symptoms. Percentages have been rounded off.

CAS is a 7-item description of clinical activity, including: 1. Spontaneous orbital pain; 2. Gaze evoked orbital pain; 3. Eyelid swelling that is considered to be due to TED; 4. Eyelid erythema; 5. Conjunctival redness that is considered to be due to active TED (ignore "equivocal" redness); 6. Chemosis; 7. Swelling of caruncle or plica. Each item is scored as 1 (present) or 0 (absent) and scores for each item are summed for total score of 0 (no inflammatory symptoms) to 7 (most inflammatory symptoms). Higher scores indicate worse symptoms. Percentages have been rounded off.

CAS is a 7-item description of clinical activity, including: 1. Spontaneous orbital pain; 2. Gaze evoked orbital pain; 3. Eyelid swelling that is considered to be due to TED; 4. Eyelid erythema; 5. Conjunctival redness that is considered to be due to active TED (ignore "equivocal" redness); 6. Chemosis; 7. Swelling of caruncle or plica. Each item is scored as 1 (present) or 0 (absent) and scores for each item are summed for total score of 0 (no inflammatory symptoms) to 7 (most inflammatory symptoms). Higher scores indicate worse symptoms. Percentages have been rounded off.

The OSDI instrument is a validated dry eye questionnaire and consists of three main sections concerning ocular symptoms, visual function, and environmental factors. It comprises of 12 questions and for every question, participants select a number between 0 and 4, where 0 equals "none of the time" and 4 equals "all of the time" with totals of score ranging from 0 to 100. Higher scores represent a worse disease index. Percentages have been rounded off.

The OSDI instrument is a validated dry eye questionnaire and consists of three main sections concerning ocular symptoms, visual function, and environmental factors. It comprises of 12 questions and for every question, participants select a number between 0 and 4, where 0 equals "none of the time" and 4 equals "all of the time" with totals of score ranging from 0 to 100. Higher scores represent a worse disease index.

Corneal staining was graded using Oxford Corneal Staining Chart which consists of a 6-point scale. Staining assessment will be based on the intensity of fluorescein staining, ranging from Grade 0 to V for each panel (0=absent; I=minimal; II=mild; III=moderate; IV= marked; and V=severe). Higher grade indicates worse disease index. The observer compares the overall appearance of the participant's corneal staining with the reference figure in the protocol. The observer selects the appropriate grade that best represents the state of corneal staining. The staining score were recorded for the exposed interpalpebral cornea and conjunctiva.

The percentage of participants achieving a complete binocular diplopia response (diplopia score=0) at Week 24 have been reported. Diplopia grade was assessed with the use of the Gorman subjective diplopia score (range: 0-3 points), which included: no diplopia (absent, scored as 0), diplopia in the primary position of gaze when the participant is tired or awakening (intermittent, scored as 1), diplopia at extremes of gaze (inconstant, scored as 2), and continuous diplopia in the primary or reading position (constant, scored as 3).

Percentage of participants who will achieve a ≥ 2 mm reduction in proptosis from baseline (Day 1) to Week 48 in the study eye, with no corresponding deterioration of proptosis (≥ 2 mm increase) in the fellow eye will be reported.

Overall Response is defined as a ≥ 2-point reduction in CAS, and a ≥ 2 mm reduction in proptosis from baseline in the study eye, provided there is no corresponding deterioration in CAS or proptosis ( ≥ 2-point/mm increase) in the fellow eye. The CAS is a 7-item description of clinical activity, including: 1. Spontaneous orbital pain; 2. Gaze evoked orbital pain; 3. Eyelid swelling that is considered to be due to TED; 4. Eyelid erythema; 5. Conjunctival redness that is considered to be due to active TED (ignore "equivocal" redness); 6. Chemosis; 7. Swelling of caruncle or plica. Each item is scored as 1 (present) or 0 (absent) and scores for each item are summed for total score of 0 (no inflammatory symptoms) to 7 (most inflammatory symptoms). Higher scores indicate worse symptoms.

The CAS is a 7-item description of clinical activity, including: 1. Spontaneous orbital pain; 2. Gaze evoked orbital pain; 3. Eyelid swelling that is considered to be due to TED; 4. Eyelid erythema; 5. Conjunctival redness that is considered to be due to active TED (ignore "equivocal" redness); 6. Chemosis; 7. Swelling of caruncle or plica. Each item is scored as 1 (present) or 0 (absent) and scores for each item are summed for total score of 0 (no inflammatory symptoms) to 7 (most inflammatory symptoms). Higher scores indicate worse symptoms.

Diplopia grade was assessed with the use of the Gorman subjective diplopia score (range: 0-3 points), which included: no diplopia (absent, scored as 0), diplopia in the primary position of gaze when the participant is tired or awakening (intermittent, scored as 1), diplopia at extremes of gaze (inconstant, scored as 2), and continuous diplopia in the primary or reading position (constant, scored as 3).

The GO-QoL is a 16-item self-administered questionnaire divided into two sub-scales and used to assess the perceived effects of TED by the participants on their: 1) Visual Functioning (questions 1-8); and 2) Appearance (questions 9-16). Both subscales and overall score (sum of scores from all 16 questions) are transformed to a scale of 0 to 100. Higher total scores indicate better QoL.

The CAS is a 7-item description of clinical activity, including: 1. Spontaneous orbital pain; 2. Gaze evoked orbital pain; 3. Eyelid swelling that is considered to be due to TED; 4. Eyelid erythema; 5. Conjunctival redness that is considered to be due to active TED (ignore "equivocal" redness); 6. Chemosis; 7. Swelling of caruncle or plica. Each item is scored as 1 (present) or 0 (absent) and scores for each item are summed for total score of 0 (no inflammatory symptoms) to 7 (most inflammatory symptoms). Higher scores indicate worse symptoms.

The CAS is a 7-item description of clinical activity, including: 1. Spontaneous orbital pain; 2. Gaze evoked orbital pain; 3. Eyelid swelling that is considered to be due to TED; 4. Eyelid erythema; 5. Conjunctival redness that is considered to be due to active TED (ignore "equivocal" redness); 6. Chemosis; 7. Swelling of caruncle or plica. Each item is scored as 1 (present) or 0 (absent) and scores for each item are summed for total score of 0 (no inflammatory symptoms) to 7 (most inflammatory symptoms). Higher scores indicate worse symptoms.

The CAS is a 7-item description of clinical activity, including: 1. Spontaneous orbital pain; 2. Gaze evoked orbital pain; 3. Eyelid swelling that is considered to be due to TED; 4. Eyelid erythema; 5. Conjunctival redness that is considered to be due to active TED (ignore "equivocal" redness); 6. Chemosis; 7. Swelling of caruncle or plica. Each item is scored as 1 (present) or 0 (absent) and scores for each item are summed for total score of 0 (no inflammatory symptoms) to 7 (most inflammatory symptoms). Higher scores indicate worse symptoms.

The GO-QoL is a 16-item self-administered questionnaire divided into two sub-scales and used to assess the perceived effects of TED by the participants on their: 1) Visual Functioning (questions 1-8); and 2) Appearance (questions 9-16). Both subscales and overall score (sum of scores from all 16 questions) are transformed to a scale of 0 to 100. Higher total scores indicate better QoL.

The CAS is a 7-item description of clinical activity, including: 1. Spontaneous orbital pain; 2. Gaze evoked orbital pain; 3. Eyelid swelling that is considered to be due to TED; 4. Eyelid erythema; 5. Conjunctival redness that is considered to be due to active TED (ignore "equivocal" redness); 6. Chemosis; 7. Swelling of caruncle or plica. Each item is scored as 1 (present) or 0 (absent) and scores for each item are summed for total score of 0 (no inflammatory symptoms) to 7 (most inflammatory symptoms). Higher scores indicate worse symptoms.

An AE is any untoward medical occurrence in a clinical study participant temporally associated with the use of a study treatment, whether or not considered related to the study treatment. An AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease (new or exacerbated) temporally associated with the use of study intervention.