Intravesical Cidofovir Instillation in HSCT Recipients With Hemorrhagic Cystitis: A Single Dose Pharmacokinetic Study
The Study Drug:
Cidofovir is designed to fight CMV (a viral infection) by blocking the CMV cells from
Cidofovir is commonly given by injection. For research purposes, in this study it will be
given directly into the bladder through a foley catheter. This is one of the first studies
where cidofovir is being given this way in humans.
Study Drug Administration:
If you are found to be eligible to take part in this study, on Day 1, Cidofovir will be put
into your bladder through your foley catheter. The catheter will be clamped for 2 hours to
keep the drug in your bladder. After 2 hours, the catheter will be unclamped. If you were
receiving bladder irrigation as therapy for your hemorrhagic cystitis, this will be
Study Tests on Day 1:
On the day you receive cidofovir, blood (about 2 teaspoons) will be drawn 6 times. The
first blood draw will occur before the cidofovir dose, and the last blood draw will occur 24
hours (+/- 1 hour) after the start of the dose. This blood will be used for pharmacokinetic
(PK) and pharmacodynamic (PD) testing. PK testing measures the amount of study drug in the
body at different time points. PD testing is used to look at how the level of study drug in
your body may affect the disease.
Viral Load Testing:
During this study, extra urine and leftover blood to be collected and used for research to
test for certain viruses. These viruses include the type of infection you had when joining
this study, as well as cytomegalovirus (CMV) and another type of herpes virus.
The urine samples will be collected before the cidofovir dose on Day 1, after the cidofovir
dose on Day 1, and again on Day 4.
Any blood left over from Day 1 testing will also be used for viral load testing.
It is possible that these urine and/or blood samples will be sent to an outside lab to
perform this testing. If that occurs, your name and any personal identifying information
will be coded before the samples are sent. Coding the samples is designed to protect your
Blood (about 2 teaspoons) will be drawn for routine tests 2 times during the week after your
On Day 7 (+/- 2 days), you will be checked for any side effects that could be related to the
In addition, on Day 14 (+/- 2 days), blood samples will be drawn for PK testing, urine will
be collected for routine tests, and your safety data will be recorded.
One final follow-up visit will take place on Day 30 (+/- 2 days). During this visit, the
study staff will record any serious side effects you may be experiencing.
Length of Study Participation:
Your active study participation will be over after the Day 7 follow-up visit (+/- 2 days).
If you experienced a side effect, however, the study staff will continue checking your
medical records until the side effect becomes stable or gets better.
This is an investigational study. Cidofovir given by injection is commercially available
and FDA approved to treat CMV in patients with HIV. It is investigational to give cidofovir
directly into the bladder of patients who have a viral infection causing bleeding in the
Up to 6 patients will take part in this study. All will be enrolled at M. D. Anderson.
Endpoint Classification: Pharmacokinetics Study, Intervention Model: Single Group Assignment, Masking: Open Label, Primary Purpose: Treatment
Systemic Absorption of Cidofovir via bladder instillation
Blood collected pre-instillation, 1 hour, 2 hours, 4 hours and 14 hours after instillation.
Roy F. Chemaly, MD, MPH, MBA
UT MD Anderson Cancer Center
United States: Food and Drug Administration