The insulin-like growth factor l (IGF-1) iscommonly expressed in most of tumor cells and plays arole in the growth and development of animal andhuman tumors. Tumor cells transfected with a vectorencoding antisense IGF-l cDNA transcriptionalcassette driven by the mouse metallothionein-l The insulin-like growth factor 1 (IGF-1) is commonly expressed in most of tumor cells and plays arole in the growth and development of animal and human tumors. Tumor cells transfected with a vectorencoding antisense IGF-1 cDNA transcriptional cassette driven by the mouse metallothionein- l