abstract = "Tumour markers are substances that are found in blood,
urine, or body tissues and that are used as indicators
for tumors; elevated tumor marker values can indicate
the presence of cancer, but there can also be other
causes. We have used a medical database compiled at the
blood laboratory of the General Hospital Linz, Austria:
Several blood values of thousands of patients are
available as well as several tumor markers. We have
used several data based modelling approaches for
identifying mathematical models for estimating selected
tumor marker values on the basis of routinely available
blood values; in detail, estimators for the tumor
markers AFP, CA-125, CA15-3, CEA, CYFRA, and PSA have
been identified and are analysed in this paper. The
documented tumour marker values are classified as
{"}normal{"} or {"}elevated{"}; our goal is to design
classifiers for the respective binary classification
problems. As we show in the results section, for those
medical modeling tasks described here, genetic
programming performs best among those techniques that
are able to identify nonlinearities; we also see that
GP results show less overfitting than those produced
using other methods.",
notes = "Also known as \cite{1830826} Distributed on CD-ROM at
GECCO-2010.