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New
"Wand" Technology to Play Key Role
The second part
of the team's research strategy involves studying the benefits
of a new radiation technology called the Photon Radiosurgery
System (PRS). Often called the "wand, the PRS is
a pencil-sized irradiation tool that can be inserted right
into a tumor to send highly controlled radiation doses.
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"This
allows us in the operating room, to visualize the tumor,
to take this pencil-sized instrument and place it inside
the tumor bed, and then apply the radiation,"
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Tremendous
support and lobbying from the Rory David Deutsch Foundation
helped make the purchase of the cutting-edge PRS (the "wand")
possible. The staggering cost notwithstanding,
the wand's sophisticated technology may allow surgeons, for
the first time, to treat deadly brain tumors more effectively,
directly and from the inside. Typically, pediatric oncologists
must apply available radiation technology, which is powerful
external radiation beams that penetrate through a child's
skull and healthy brain tissue as well as the tumor and tumor
bed.
Unfortunately,
these external radiation treatments can damage healthy tissues,
and often are ineffective at treating the fast-growing brain
stem gliomas which claim the lives of 96 percent of
children they strike. According to CMH researchers, the powerful
new wand therapy may be the newest weapon in the fight to
deter and hopefully destroy these cancerous brain tumors.
The
prime benefit of the wand is that it directs the radiation
from the inside out in a narrow and defined range of tissue.
"This allows
us in the operating room, to visualize the tumor, to take
this pencil-sized instrument and place it inside the tumor
bed, and then apply the radiation, said Dr. Goldman.
"The wand only penetrates tissue in millimeter-sized
areas. Through a robotic arm, and using information we're
getting from computers and MRIs [magnetic resonance images],
we take the wand, map out the tumor area and then treat the
tumor.
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How
CMH is Coordinating Efforts
In the first year
of the CMH wand study, according to Dr. Maryanne Marymont,
director of pediatric radiation oncology at CMH, the team
will evaluate how normal tissues tolerate the wand treatments,
as well as how well the wand treatments destroy tumor cells.
"For about
a year we'll be doing laboratory models and testing the Photon
Radiosurgery wand before using it in the patient setting,
said Dr. Marymont. "During the year we'll be assessing
the toxicity and effectiveness of varying doses of the highly
localized radiation from the wand.
After year one
of the parallel chemotherapy and radiation studies, according
to Dr. Goldman, the teams will begin coordinating the studies
by joining Thalidomide treatments with the wand technology
in patient applications.
"For now
we need to catalog the actions of both separately to establish
what's safe with the photon arm, what dosages work best. We
know the safety advantages established in adults, so now we're
establishing the safety in children, said Goldman. "In
year two, with the other scientists and physicians from the
other participating institutions, we'll add the chemotherapy
agents concurrently.
To expedite their
local and worldwide research efforts, the team's researchers
are continuing to search for a full-time scientist who will
fulfill a multi-year commitment to the studies. Supported
initially by funding from the Rory David Deutsch Brain Tumor
Research Program, this scientist will oversee the lab research
that the team of neuro-scientists is conducting in the coming
years.
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CMH
Teams Exploring Other Treatments
CMH Teams Exploring
Other Treatments
In the second year of the research studies, the teams will
be introducing another new drug therapy in early clinical
trials with children suffering from brain tumors.
This glucose-based
drug treatment, called Oral 2-Deoxyglucose, is an agent that
interrupts the metabolic or growth pattern in normal cells.
A study conducted in India established the treatment's effectiveness
in adults. Now researchers are keen to discover its benefits
in destroying pediatric brain tumors and brain stem gliomas
in particular.
"We have
completed a concept proposal that has been scientifically
accepted, and now we're looking for a pharmaceutical company
to manufacture the compound for us, said Dr. Goldman.
These
and other treatments are also being studied on behalf of the
Rory David Deutsch Brain Tumor Research Program, and by the
Childrens Memorial Hospital researchers. For instance,
with approximately $60,000 from the Rory David Deutsch Foundation,
new equipment was purchased for an exciting study being formed
and conducted by Dr. John Kalapurakal at Northwestern University.
According to Dr. Goldman, the study is looking to find ways
to optimize traditional radiation treatments.
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