Brain Tumors Clinical Trial
Official title:
Phase 1 Study Nuclear Imaging of Human CSF Flow Using Ga-67 Citrate and In-111 DTPA
- Primary Objective will be to evaluate the use of Ga-67 citrate as an alternative
radiopharmaceutical for CSF imaging.
- Secondary Objective will be to evaluate the biodistribution, pharmacokinetics and
radiation dosimetry of In 111 DTPA and gallium-67 after intrathecal injection during
remission of leptomeningeal metastasis (LM) and during LM occurrence, remission and
recurrence.
In-111 DTPA is a radioactive dye that is standardly used to check the flow of CSF. Ga-67
citrate has been used to detect inflammation and tumors in other parts of the body, and
researchers want to learn if it is also able to detect tumors in the brain and spinal cord.
Before you can be enrolled in this study, you will have "screening tests." These tests will
help the doctor decide if you are eligible to take part in this study. Blood (about 1-2
tablespoons) will be drawn for routine tests. This routine blood draw will include a
pregnancy test for women who are able to have children. To be eligible to take part in this
study, the pregnancy test must be negative.
If you are found to be eligible to take part in this study, you will be assigned to 1 of 3
groups. The group you are assigned to will depend on whether tumor cells were found in the
CSF during your last spinal fluid exam. If you were found to have cancer cells in the CSF
and you have had no earlier treatment for this type of disease, the first 5 participants
will be assigned to Group A and will be given Ga-67 citrate injection alone, in the baseline
study. The next 5 participants who have cancer cells in the CSF and have had no earlier
treatment will be assigned to Group B. Group B will have Ga-67 and In 111 DTPA injection in
the baseline study. Otherwise, if the tumors in the CSF have been treated and are now
cleared from the CSF, you will be assigned to Group C and will receive standard follow-up
care.
At the beginning of the study, you will have an imaging session. This first imaging session
is called the "baseline" session. For the imaging, you will lie on a gamma camera table.
Depending on which group you are in, one or both of the radioactive dyes will be injected
into your CSF through the Ommaya reservoir. If you are in Group B or C, both In-111 DTPA and
Ga-67 citrate will be injected over about 2-4 minutes, total. If you are in Group A, Ga-67
citrate alone will be injected over about 2 minutes.
For participants who are 2-17 years old, the doses of In-111 DTPA and Ga-67 citrate will be
adjusted to the surface area of your body (a measurement of your body size).
During the hour immediately following the injections, your head, neck, and back areas will
be imaged (scanned) in order to see how the CSF flows. After that, you will have scans of
your entire body performed in order to see how quickly the radioactive dyes leave from
different parts of your body. These whole-body scans will each last 20 minutes. These scans
(1 each time) will occur at 1-2, 3-4, 6-8, 22-24, 28-32, 48, and 72 hours after the
injections. You will have blood samples collected before injection and during each imaging
session in order to measure how much radiation is absorbed by different parts of your brain,
spine, and other organs. These blood samples (less than ¼ teaspoon each time) will be drawn
during each of the whole-body scans.
If you are in Group A or B, you will receive standard follow-up care for up to 52 weeks
after the baseline imaging session. This is in order to check the status of the disease. If
the cancer goes into remission (no tumor cells are found in CSF) at any time during the 52
weeks, you will have a follow-up imaging session. The follow-up imaging session will include
the same procedures, and In-111 DTPA and/or Ga-67 citrate injections as the baseline imaging
session.
If you are in Group C, you will receive standard follow-up care for up to 52 weeks after the
baseline imaging session. If the cancer reappears at any time during the 52 weeks, you will
have a follow-up imaging session. The follow-up imaging session will include the same
procedures, and In-111 DTPA and Ga-67 citrate injections as the baseline imaging session.
Whether you are in Group A, B or C, after your last follow-up imaging session, your
participation in this study will be over. If your cancer clears from the spinal fluid, the
records from your routine visit to the neuro-oncology clinic will be reviewed to follow your
progress until 30 days after the radioisotope injection for your last imaging session.
Researchers will review your medical records for potential side effects. If you do not have
a clinical visit within a week from that 30th day, the study chair will contact you by phone
concerning these matters.
This is an investigational study. In-111 DTPA is commercially available and FDA approved for
injection into the CSF. Although Ga-67 citrate is FDA approved for injection into a vein, it
is not FDA approved for injection into the CSF. It is commercially available, but injecting
it into the CSF has only been authorized for use in research. Up to 20 patients will take
part in this study. All will be enrolled at M. D. Anderson.
;
Allocation: Non-Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Single Group Assignment, Masking: Open Label, Primary Purpose: Treatment
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