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Time-dependent aggregation of reconstituted BCG vaccine
T L Ratliff1, J K Ritchey, J Brandhorst
1Department of Surgery (Urology), Washington University School of Medicine, St. Louis, Missouri 63110.
The Journal of Urology
|December 1, 1994
Summary
Storage of diluted Bacillus Calmette-Guérin (BCG) vaccines for bladder cancer can lead to time-dependent aggregation, reducing antitumor activity. For optimal efficacy, reconstitute and dilute BCG immediately before intravesical instillation.
Area of Science:
- Oncology
- Immunology
- Vaccinology
Background:
- Intravesical Bacillus Calmette-Guérin (BCG) is a standard treatment for superficial bladder cancer.
- Current guidelines allow storage of diluted BCG vaccines for up to 2 hours post-reconstitution.
- The impact of storage on BCG quality and efficacy remains under-investigated.
Purpose of the Study:
- To analyze the effects of reconstitution, dilution, and storage on BCG vaccine quality and antitumor activity.
- To evaluate the impact of storage time on various BCG vaccine preparations for intravesical use.
Main Methods:
- Examined time-dependent aggregation of multiple BCG vaccine preparations (Connaught, Institute Armand Frappier, Japanese, Pasteur, RIVM, Tice) after reconstitution and dilution.
- Assessed the effect of the liquid/gas interface on visible aggregation.
- Evaluated colony forming unit counts and antitumor activity in relation to storage time.
Main Results:
- All tested BCG vaccine preparations exhibited time-dependent aggregation post-reconstitution and dilution.
- Visible aggregation was mitigated by minimizing the liquid/gas interface.
- While aggregation did not impact colony forming unit counts, it significantly reduced antitumor activity.
Conclusions:
- BCG vaccine aggregation occurs after reconstitution and dilution, influenced by storage.
- Storage of diluted BCG adversely affects its antitumor efficacy.
- For optimal therapeutic outcomes in superficial bladder cancer treatment, BCG vaccines should be prepared immediately prior to intravesical administration.