Chairman
Paul Calabresi, M.D.

Executive Secretary
Mrs. Barbara S, Bynum

Board Members
Frederick F. Becker, M.D.
Erwin Bettinghaus, Ph.D.
David G. Bragg, M.D.
Ms. Zora Brown

Kenneth Chan, Ph.D.
John R. Durant, M.D.
Bernard Fisher, M.D.
Phillip Frost, M.D.

Mrs. Brenda L. Johnson

Walter Lawrence, Jr., M.D.

Mrs. Marlene A. Malek
Deborah K. Mayer, R.N.
Mrs. Irene S. Pollin
Sidney Salmon, M.D.
Howard M. Temin, Ph.D.
Samuel Wells, Jr., M.D.

National Cancer Advisory Board

9000 Rockville Pike, Bethesda, Maryland 20892 Tel (301) 496-5147 Fax (301) 402-0062

October 31, 1991

Dr. Joshua Lederberg
Rockfeller University

Box 400

1230 York Avenue

New York, New York 10021

Dear Dr. Lederberg:

On behalf of the National Cancer Advisory Board, I am pleased to give you
advance notice of the Twentieth Anniversary Symposium commemorating the
signing of the National Cancer Act. You will soon receive a formal invitation
from the Chairman of the National Cancer Advisory Board and the Director
of the National Cancer Institute requesting your attendance.

The National Cancer Advisory Board felt that it would be appropriate to hold
this commemorative activity in conjunction with its winter meeting and we have
therefore arranged to have the Symposium occupy the full second day of the
Board meeting, Tuesday, November 26, 1991.

The proceedings will begin at 8:00 a.m. in the Masur Auditorium of the Warren
G. Magnuson Clinical Center (Building 10) here at the National Institutes of
Health. An agenda and a logistics information sheet are enclosed. Should you
require accommodations, please note that in order to take advantage of the
special rate offerred by the Hyatt Regency Bethesda, a reservation for lodgings
must be made no later than November 14th.

We do hope that you will be able to attend. The members of the Board, as
well as staff of the National Cancer Institute, look forward to sharing this
milestone event with you.

Sincerely yours,

Barbara ¥ Bynum
Executive Secretary

ONAL
CER
INSTITUTE

Enclosure