The GETUG 15 trial tested whether adding docetaxel chemotherapy to androgen deprivation therapy (ADT) would prolong overall survival in 385 men with hormone-sensitive metastatic prostate cancer. The trial found that adding docetaxel to ADT significantly prolonged both progression-free survival and clinical progression-free survival compared to ADT alone, with median progression-free survival of 23 months versus 13 months and median clinical progression-free survival of 23 months versus 15 months. However, the trial found no significant difference in overall survival between the two groups, with median overall survival of 59 months for those receiving docetaxel plus ADT versus 54 months for ADT alone.