Dr. Amy Colson: The study we discussed today was a phase two trial that explored the effectiveness of a once-weekly oral combination therapy consisting of Lenacapavir and Islatravir, compared to the standard daily oral regimen of Bictegravir/Emtricitabine/Tenofovir Alafenamide (B/F/TAF). Participants who had maintained viral suppression on B/F/TAF for at least 24 weeks, with a CD4 count above 350, were randomized in an open-label fashion to either continue with their current regimen or switch to the new weekly combination of Islatravir and Lenacapavir. Our findings at the 24-week mark showed that virologic suppression was maintained equally in both groups at a rate of 92%. Only one participant on Islatravir experienced a detectable viral load, attributed to unique circumstances, yet showed a promising decrease in viral load over time.
Infectious Disease Frontier: Thank you for sharing. Can you elaborate on the safety performance of Islatravir in this study, especially regarding any dosage adjustments from previous research?
Dr. Amy Colson: Of course. Concerns related to CD4 count and lymphocyte declines observed at higher doses of Islatravir in previous studies prompted us to select a lower dose of 2 milligrams per week for this trial. Using data from earlier trials, pharmacokinetic/pharmacodynamic (PK/PD) models helped us understand the relationship between Islatravir's dose and CD4 count declines. Our results indicated no significant difference in CD4 or lymphocyte counts between the Islatravir-Lenacapavir group and the B/F/TAF group throughout the study, confirming the absence of associated toxicities at the chosen dosage.
03
《感染医线》:考虑到新的治疗方案,该研究是否包括耐药突变的监测?
Infectious Disease Frontier: Does the study include monitoring for resistance mutations, considering the novel treatment regimen?
Dr. Amy Colson: As the majority of participants maintained viral suppression, extensive resistance testing was not necessary. However, for the single case with detectable viremia prior to receiving the treatment, resistance testing showed no mutations against either Islatravir or Lenacapavir, indicating a low risk of developing resistance with this regimen.
04
《感染医线》:您认为周疗口服方案,与一年两次、两个月一次的长效注射剂方案,有怎样的优势或劣势?
Infectious Disease Frontier: How do you compare the advantages or disadvantages of this weekly oral regimen with existing long-acting injectable treatments?
Dr. Amy Colson: Both options have their unique benefits tailored to patient preferences and lifestyles. Some patients appreciate the convenience of less frequent clinic visits for injections, while others prefer a weekly oral option that offers discretion and avoids the daily reminder of their condition. The key advantage is providing choices to patients, enabling a personalized approach to treatment that accommodates different needs and preferences.
Amy Colson, MD, MPH
Community Resource Initiative, Boston, MA, USA
社区资源倡议(Community Resource Initiative)是一家位于美国马塞诸萨州的非盈利性公共卫生机构,旨在整合药物援助、保险导航、预防和研究,提供以客户为中心的整体方法,促进医疗保健领域的社会正义和公平;目标是减少马萨诸塞州的传染病,包括艾滋病毒和结核病;其中的艾滋病毒药物援助计划(HDAP)是马萨诸塞州公共卫生部传染病和实验室科学局艾滋病毒/艾滋病办公室的一项计划。Amy Colson担任该院的研究主任(Director of Research)