A distributor for a system for interactive interstitial photodynamic and photothermal tumor therapy and tumor diagnosis, comprises a plurality of primary radiation conductors arranged for conducting radiation to and from the tumor site, a plurality of secondary radiation conductors, two flat discs abutting against each other, wherein a first of said discs is fixed and the second of said discs is turnable relatively to the other disc, and each disc has holes arranged on a circular line. The proximal ends of the primary radiation conductors are fixed in the holes of the fixed disc and distal ends of the secondary radiation conductors are fixed in the holes of the turnable disc, whereby the primary and the secondary radiation conductors by rotation of the turnable disc are connectable to each other in different constellations.
