[Concomitant use of radiotherapy and gemcitabine: preclinical findings and clinical practice].

Gemcitabine is pyrimidine analog which has demonstrated antitumoral activity in a variety of solid tumors. Laboratory studies demonstrating that gemcitabine is a potent radiosensitizer led to a variety of trials combining radiation and gemcitabine. In the clinic, phase I-II studies are still trying to determine the optimal dose and schedule which could be use in daily clinical practice. This review summarizes the mechanisms of interaction between radiotherapy and gemcitabine and presents several therapeutic schemes for each tumor location.