Piedbois P, Rougier P, Buyse M, et al. Efficicay of intrav enous continuous infusion of fluorouracil compared with bolus administrati on in advanced colorectal cancer. J Clin Oncol 16: 301-8; 19987 4. Piedbois P, Buyse M, Rustum D, et al. Modulation of fluorouracil by leukovorin in patients with advanced colorectal caner: evid ence in terms of respons e rate. J Clin Oncol 10: 896-903; 1992.