[1] Department of Gastrointestinal Medical Oncology,
[2] Box 426,undefined
[3] The University of Texas M. D. Anderson Cancer Center,undefined
[4] 1515 Holcombe Boulevard,undefined
[5] Houston,undefined
[6] TX 77030-4009,undefined
[7] USA Tel. +1-713-792-2828; Fax +1-713-745-1163 e-mail: jajani@mail.mdanderson.org,undefined