Numerical chromosome 1, 12 and 15 distributions in invasive germ cell tumor components and adjacent carcinoma in situ of the human adult testis. A study based on the simultaneous application of interphase cytogenetics and immuno-histochemistry on tissue sections: L.H.J. Looijenga, A.J.M. Gillis, W.L.J. van Putten, J.W. Oosterhuis. Laboratory of Experimental Patho-Oncology, Dr. Daniel den Hoed Cancer Center, Rotterdam, The Netherlands