\HeaderA{colon}{Chemotherapy for Stage B/C colon cancer}{colon}
\keyword{survival}{colon}
\begin{Description}\relax
These are data from one of the first successful trials of
adjuvant chemotherapy for colon cancer. Levamisole is a low-toxicity
compound previously used to treat worm infestations in animals; 5-FU
is a moderately toxic (as these things go) chemotherapy agent. There
are two records per person, one for recurrence and one for death
\end{Description}
\begin{Usage}
\begin{verbatim}data(colon)\end{verbatim}
\end{Usage}
\begin{Format}\relax
\Tabular{ll}{
id:& id\\
study:& 1 for all patients\\
rx:& Treatment - Obs(ervation), Lev(amisole), Lev(amisole)+5-FU\\
sex:&  1=male\\
age:& in years\\
obstruct:& obstruction of colon by tumour\\
perfor:& perforation of colon\\
adhere:& adherence to nearby organs\\
nodes:& number of lymph nodes with detectable cancer\\
status:& censoring status\\
differ:& differentiation of tumour (1=well, 2=moderate, 3=poor)\\
extent:& Extent of local spread (1=submucosa, 2=muscle, 3=serosa,
4=contiguous structures)\\
surg:& time from surgery to registration (0=short, 1=long)\\
node4:& more than 4 positive lymph nodes\\
time:& days until death\\
etype:& 1=recurrence,2=death\\
}
\end{Format}
\begin{Source}\relax
Danyu Lin
\end{Source}