This study consisted of 3 cohorts (A to C). Cohort A consisted of adults who had completed 2 injections of SPIKEVAX as a primary vaccination. Cohort B consisted of older adults who had completed 2 injections of COMIRNATY as a primary vaccination. Cohort C consisted of older adults who had completed 2 injections of SPIKEVAX as a primary vaccination. In the immunogenicity subset, all participants were Asian, and the proportions of male participants were 50.0%, 75.9%, and 66.7% in Cohort A, Cohort B, and Cohort C, respectively (hereinafter the same order). The median age (min-max) was 48.0 (20-64) years, 67.0 (65-75) years and 67.0 (65-79) years, respectively. The mean body mass index (BMI) (standard deviation [SD]) was 23.06 (3.50), 23.09 (3.85), and 25.61 (3.23), respectively.
A total of 155 participants (103 in Cohort A, 29 Cohort B, and 23 in Cohort C) (hereinafter the same order) were enrolled and received the first booster vaccination with S-268019-b. Of these, 86 participants (51, 18, 17) received the second booster vaccination with S-268019-b. A total of 150 participants (100, 29 ,21) were included in the immunogenicity subset.
No deaths or treatment-related SAEs were reported. Regarding the first booster vaccinaton, solicited systemic AEs was reported in 68.0% (70/103) of participants in Cohort A, 34.5% (10/29) of participants in Cohort B, and 56.5% (13/23) of participants in Cohort C (hereinafter the same order). Most common solicited systemic AEs (25% or greater incidence in any cohort) were fatigue (49.5%, 17.2%, and 34.8%) and headache (33.0%, 24.1%, and 17.4%). Solicited local AEs were reported in 94.2% (97/103) of participants, 79.3% (23/29) of participants, and 87.0% (20/23) of participants. Most common solicited local AEs (40% or greater incidence in any cohort) were pain (92.2%, 75.9%, and 78.3%) and erythema/redness (44.7%, 37.9%, and 43.5%). Regarding the second booster vaccinaton, Solicited systemic AEs were reported in 68.6% (35/51) of participants, 27.8% (5/18) of participants, and 47.1% (8/17) of participants. Most common solicited systemic AEs (25% or greater incidence in any cohort) were fatigue (47.1%, 16.7%, and 41.2%) and headache (37.3%, 27.8%, and 23.5%). Solicited local AEs were reported in 90.2% (46/51) of participants, 77.8% (14/18) of participants, and 88.2% (15/17) of participants. Most common solicited local AEs (40% or greater incidence in any cohort) were pain (86.3%, 77.8%, and 82.4%), erythema/redness (49.0%, 27.8%, and 64.7%), induration (41.2%, 27.8%, and 70.6%), and swelling (39.2%, 27.8%, and 64.7%).
Regarding the first booster vaccinaton, the GMTs of SARS-CoV-2 neutralizing antibody in all cohorts increased from baseline to Day 29 after the first booster injection. The GMT (95% CI) on Day 29 was 99.35 (83.44, 118.29), 76.14 (55.38, 104.67), and 129.96 (88.79, 190.22) in Cohort A, Cohort B, and Cohort C, respectively. The seroresponse rate (95% CI) of SARS-CoV-2 neutralizing antibody titer on Day 29 was 86.5% (78.0%, 92.6%), 100.0% (87.7%, 100.0%), and 95.0% (75.1%, 99.9%). Regarding the second booster vaccinaton, the GMTs of SARS-CoV-2 neutralizing antibody in all cohorts also increased. The GMTs (95% CI) on Day 179 (28 days after the second booster injection) were 145.57 (114.16, 185.61), 91.10 (57.99, 143.13), and 160.00 (101.13, 253.15). The seroresponse rate (95% CI) of SARS-CoV-2 neutralizing antibody titer on Day 179 was 61.4% (45.5%, 75.6%), 31.3% (11.0%, 58.7%), and 53.3% (26.6%, 78.7%).
There were no significant concerns about the safety of both first and second booster injections with S-268019-b in adults or older adults who had completed 2 injections of SPIKEVAX as a primary vaccination and older adults who had completed 2 injections of COMIRNATY as a primary vaccination. It was suggested that both first and second booster injections with S-268019-b can induce a sufficient immune response as a booster vaccination.
A Phase 3, Open-label Study to Evaluate Safety of a Booster Dose of S-268019 in Adults and Older Adults Who Have Completed COVID-19 Vaccine as a Primary Series (COVID-19)
Participant must be >= 20 years of age inclusive, at the time of signing the informed consent.
Participant who have received 2 doses of SARS-CoV-2 vaccine (Adults:only SPIKEVAX, Older adults: COMIRNATY or SPIKEVAX) and 6 months or more and 8 months or less after second dose.
Positive SARS-CoV-2 antigen test result at Screening.
A known history of SARS-CoV-2 infection as determined by medical interview before study intervention.
Participant has a contraindication to IM injections or blood draws.
One dose of S-268019 via intramuscular injection.
Participants who provided informed consent for the second booster dose will receive one dose of S-268019 again via intramuscular injection.
主たる評価項目 / Primary Outcome(s)
安全性
Safety
(2)試験等に用いる医薬品等の概要
医薬品、医療機器、再生医療等製品の別
医薬品
医薬品医療機器等法における未承認、適応外、承認内の別
未承認
一般名称等
医薬品
一般名称
S-268019
販売名(海外製品の場合は国名も記載すること)
なし
承認番号
なし
3 試験等の実施状況の確認に関する事項
(1)監査の実施予定
(2)試験等の進捗状況
試験等の進捗状況
進捗状況
/ Recruitment status
研究終了
Complete
4 試験等の対象者に健康被害が生じた場合の補償及び医療の提供に関する事項
5 依頼者等に関する事項
(1)依頼者等に関する事項
依頼者等の名称
塩野義製薬株式会社
Primary Sponsor
Shionogi & Co., Ltd.
物品提供の有無
役務提供の有無
(2)依頼者以外の企業からの研究資金等の提供
研究資金等の提供組織の有無
あり
研究資金等の提供組織名称 / Source of Monetary Support
厚生労働省
Ministry of Health, Labour and Welfare
Secondary Sponsorの該当性
非該当
6 IRBの名称等
IRBの名称 / Name of IRB
医療法人社団慶幸会ピーワンクリニック 治験審査委員会
P-One Clinic, Keikokai Medical Corporation IRB
住所 / Address
東京都八王子市八日町8-1ビュータワー八王子4F
View Tower Hachioji 4F, 8-1 Yokamachi Hachioji City, Tokyo