The EGFR FISH results obtained in the scored tumor cells are summarized by four indexes representing the (a) percentage of cells carrying at least 4 copies of the EGFR signals, (b) percentage of cells carrying at least 15 copies of the EGFR signals, (c) average ratio of EGFR gene signals/CEP 7 signals per cell, and (d) presence of loose or tight gene clusters or atypically large gene signals. Here, EGFR is linked to neoplasm.