Impact of resection versus no resection of the primary tumor on survival in patients with colorectal cancer and synchronous unresectable metastases: protocol for a randomized multicenter study (CR4)

1. Biondo, S.
2. Frago, R.
3. Kreisler, E.
4. Espin-Basany, E.
5. Pons, L.V.
6. Carrion, J.A.
7. de Laspra, E.C.D.
8. de la Portilla de Juan, F.
9. Román, M.P.
10. Calvo, A.P.C.P.
11. Navascués, J.M.E.
12. Sanz, C.M.
13. Márquez, M.F.
14. Lozano, M.Á.C.
15. Ausàs, I.C.
16. Gallego, M.Á.
17. Cazador, A.C.
18. Macías, A.E.
19. López, L.M.
20. Alvarado, N.C.