Inclusion Criteria:
- rectal adenocarcinoma
- R0 surgery
- T3, N0, M0 or T4, N0, M0 or N1,2, M0
- chemotherapy can be started within 8 weeks after surgery
- Age > 18
- Performance status ECOG < 3
- preoperative radiotherapy allowed
- preoperative chemotherapy with 5FU +/- LV allowed
- Neutrophiles > 1 500/mm3; Pl. > 100 000/mm3
- Transaminases < 2 x UNL; Alcalines Phosphatases < 2 x UNL; Bili < 1.1 UNL
- creatininemia < 120 µmol/l and/or clearance of creatininemia > 60 ml/mn
- Written informed consent before inclusion
Exclusion Criteria:
- postoperative radiotherapy
- Distant metastases
- Contraindication to any drug contained in the chemotherapy regimens
- Any serious active disease or co-morbid medical condition including digestive
inflammatory disease
- Gilbert disease
- severe toxicity of radiotherapy
- Pregnancy or breast feeding
- Absence of contraception in non menopausal women
- Adult patient unable to give informed consent because of intellectual impairment
- Concomitant participation to another trial