14-cancer  gene expression data. 16,063 genes, 144 training samples,
54 test samples. 

One gene per row, one sample per column

Cancer classes are labelled as follows:

1.  breast
2.  prostate
3.  lung
4.  collerectal
5.  lymphoma
6.  bladder
7.  melanoma
8.  uterus
9.  leukemia
10. renal
11. pancreas
12. ovary
13. meso
14. cns

Reference:

S. Ramaswamy and P.  Tamayo and  R. Rifkin and S. Mukherjee and C.H. Yeang and
M. Angelo and C. Ladd and M. Reich and E. Latulippe and J.P. Mesirov and
T. Poggio and W. Gerald and M. Loda and E.S. Lander and  T.R. Golub (2001)

Multiclass Cancer Diagnosis Using Tumor Gene Expression Signatures

Proc. Natl. Acad. Sci., 98, p15149-15154.