1. UNIV PALERMO,SCH MED,SECT EXPT ONCOL,I-90144 PALERMO,ITALY. UNIV PALERMO,DEPT CELLULAR & DEV BIOL,I-90128 PALERMO,ITALY. UNIV PALERMO,SCH MED,DEPT CLIN ONCOL RES,DIV SURG ONCOL,I-90127 PALERMO,ITALY. UNIV PALERMO,SCH MED,INST PATHOL R,I-90127 PALERMO,ITALY. EPIDEMIOL OBSERV CTR SICILIAN REG,I-90100 PALERMO,ITALY.