The diagnosis of cancer in the inaccessible regions of the
gastrointestinal tract is difficult at best. Neoplasia frequently
advances insidiously and largely without the patient's knowledge.
Ideally, simple survey tests applied periodically to those segments of
the population considered most susceptible should be available. For all
practical purposes such means of diagnosis are nonexistent. Those who
specialize in gastro- intestinal cancer must, therefore, do the best
they can. The best consists of many means, all good in themselves, but
often subject to failure or misinterpretation of results. Any aid which
will give even a small amount of positive information to tip the balance
for or against the diagnosis of cancer in an obscure situation must be
considered of value to the gastroenterologist. The material presented in
this volume represents our experience with such an aid over the past
eight years. The use of radioactive phosphorus (P3l!) and a miniature
Geiger counter to record the differences in beta emission over tumors as
compared to normal tissue now appears clinically useful in the diagnosis
of gastrointestinal malignancy where the organ is available for such
instrumentation. An attempt has been made to present the findings as
objectively and as specifically as possible so as to provide maximum
assistance to other gastrointestinal oncologists as well as others who
have only a general interest in the subject.