Accordingly , germ cell tumours usually develop in the testicles or in the ovaries .
A germ cell tumour develops from a germ cell , which is reproductive cell that develops into sperm cells in men and egg cells in women .
Germ cell tumours usually develop in the testicles or in the ovaries .
A germ cell tumour develops from a germ cell , which is reproductive cell that develops into sperm cells in men and egg cells in women .