Mind-Body Connection In Placebo Surgery Trial Studied By University of Denver Researcher
08 Apr 2004

12 month quality of life study with Parkinson's patients shows surprising results Patients with Parkinson's disease who
thought they had received a transplant of human neurons into their brains--but who really hadn't--reported an improved
quality of life one year later.

In the April issue of the Archives of General Psychiatry, research reported by Dr. Cynthia McRae of the University of
Denver's College of Education provides strong evidence for a significant mind-body connection among patients who
participated in a double-blind Parkinson's surgical trial.

Forty persons from the United States and Canada participated to determine the effectiveness of transplantation of human
embryonic dopamine neurons into the brains of persons with advanced Parkinson's disease. Twenty patients received the
transplant while 20 more were randomly assigned to a sham surgery condition.

Dr. McRae reports that the "placebo effect" was strong among the 30 patients who participated in the quality of life
portion of the study.

"Those who thought they received the transplant at 12 months reported better quality of life than those who thought
they received the sham surgery, regardless of which surgery they actually received," says Dr. McRae. More importantly,
objective ratings of neurological functioning by medical personnel showed a similar effect. In the Archives report, Dr.
McRae writes "medical staff, who did not know which treatment each patient received, also reported more differences and
changes at 12 months based on patients' perceived treatment than on actual treatment."

One patient, for example, reported that she had not been physically active for several years before surgery, but in the
year following surgery she resumed hiking and ice skating. When the double blind was lifted, she was surprised to find
that she had received the sham surgery.

Although patient perceptions influenced their test scores, when the total sample of patients was grouped by the actual
operation they received, patients who had the actual transplant surgery showed improvement in movement while, on
average, patients who had sham surgery did not.

Professor Dan Russell of the Institute for Social and Behavioral Research at Iowa State, the study's co-author, says
the findings have both scientific and practical implications.

"This study is extremely important in regard to the placebo effect because we know of no placebo studies that have
effectively maintained the double-blind for at least 12 months. The average length of placebo studies is eight weeks,"
according to Russell. Dr. McRae notes that similar results related to the placebo effect have been found in other
studies with patients with Parkinson's disease. She says that there is a need for placebo controls in studies
evaluating treatment for Parkinson's as the placebo effect seems to be very strong in this disease. Dr. McRae also
reports that although the sham surgery research design is somewhat controversial and has raised some ethical concerns,
the results of this study show "the importance of a double-blind design to distinguish the actual and perceived values
of a treatment intervention."

The surgical trials were done at the University of Colorado Health Sciences Center by Drs. Robert Breeze and Curt Freed
with neurological evaluations at Columbia University Medical Center in New York by Dr. Stanley Fahn and Dr. Paul
Greene.

-----------------------

The University of Denver (www.du.edu), the oldest private university in the Rocky Mountain Region, enrolls
approximately 9,500 students in its undergraduate, graduate and professional programs. The Carnegie Foundation
classifies the University of Denver as a Doctoral/Research University-Extensive.

Total undergraduate enrollment for Fall 2003 was 4,481, including 1,028 first-year, traditional undergraduate students.
Graduate enrollment was 5,024. Overall, 105 nations are represented in the student body, and non-U.S. citizens comprise
almost seven percent of the student population.

Contact: Jim Berscheidt
[log in to unmask]
303-871-3172
University of Denver

SOURCE: Medical News Today, UK
http://www.medicalnewstoday.com/index.php?newsid=7100

* * *

----------------------------------------------------------------------
To sign-off Parkinsn send a message to: mailto:[log in to unmask]
In the body of the message put: signoff parkinsn