SC-101

The treatment choice of advanced gastric carcinoma after failure from first-line therapy is quite limited. To evaluate the efficacy and toxicity of S-1 monotherapy in patients with advanced gastric cancer after failure of first line cisplatin and fluorouracil combination (CF). S-1 monotherapy as a second line treatment was given to the patients who had failed to CF combination in SC-101 study. The efficacy and toxicity of S-1 monotherapy were evaluated exploratory. The results indicated that forty-one patients received S-1 as a second line therapy after disease progression. The overall response rate and disease control rate were 14.6% and 41.5%, respectively. The median progression free survival (PFS) was 5.1 months (range: 2.9~6.2 month). The median overall survival time was 6.4 months. The survival rates at 6 month and 1 year were 56% and 7.3%, respectively. Grade 3/4 adverse events were uncommonly occurred, including anemia (2.4%), neutropenia (2.4%), thrombocytopenia (4.9%) and rash (2.4%). There were no unexpected or life-threatening toxicities. Only one patient experienced dose reduction due to grade 3 rash. In conclusion, S-1 monotherapy provided a mild response rate and overall survival, and a favorable toxicity profile in the second line setting after the first line failure to cisplatin and fluorouracil combination.

We have developed a 5′-capping library screening (CLS) method using over 30 different novel cap analogues. The optimal 5′-cap for the coronavirus disease 2019 (COVID-19) mRNA vaccine STP2104 was selected and applied. This is the first report to describe the proven safety of the novel cap analogue, SmartCap® SC101, in humans and emphasize the importance of cap selection. STP2104 demonstrates safety, tolerability, and strong immune responses in humans. After confirming its safety through a GLP toxicity study, STP2104 was administered intramuscularly as a two-dose vaccine, separated by 28 days, in COVID-19-naive, healthy adult volunteers. In this multicenter, open-label, dose-escalation, phase I study with 30 participants (18 to 55 years of age), 15 individuals each were assigned to the low-dose (25 μg) and high-dose (50 μg) cohorts. The primary endpoints were the safety and immunogenicity in all cohorts. During the reporting period of the trial, no serious adverse events were reported. A plaque reduction neutralization test demonstrated an at least 21-fold increase in NAb titers from both cohorts when comparing pre-vaccination to 4-week post-second vaccination. These safety and NAb titer interim results support the efficiency and safety of SC101 and the STP2104 mRNA vaccine, including how STP2104 effectively induces NAb titers against SARS-CoV-2.