A kit-of-parts for the flow cytometric detection of pediatric tumor cells, the kit comprising fluorochrome-conjugated antibodies directed against the cell surface markers CD45, CD56, GD2, CD99, CD8, EpCAM, CD4, smCD3, CD19 and CD271, the cytoplasmic marker cyCD3, and the nuclear marker(s) nuMyogenin and/or nuMyoD1, wherein
- (i) the antibodies against the markers CD99/CD8 are conjugated to the same fluorochrome and representing a first marker pair CD99/CD8;
- (ii) the antibodies against the markers EpCAM/CD4 are conjugated to the same fluorochrome and representing a second marker pair EpCAM/CD4;
- (ii) the antibody against CD271 is conjugated to the same fluorochrome as the antibody against either cyCD3 or smCD3 and representing a third marker pair CD271/cyCD3 or CD271/smCD3;
- wherein the kit comprises antibodies conjugated to ≥8 distinguishable fluorochromes;
- wherein between the first, second and third marker pairs the fluorochromes are distinguishable;
- and wherein the antibodies against the cytoplasmic and the nuclear markers are physically separated from the antibodies against the cell surface markers.