Table 2. The main differences between epithelial tumours and malignant ovarian germ tumours.

Characteristics	Epithelial tumours	Cell tumours germs
Prevalence	Much more common	Less common
Age group	Mainly adult women*	Mainly female children and young women
Affected race	More common in white women	More common in black and Asian women
Laterality	Malignant serous and mucinous tumours, clear cells and endometrioid; they are bilateral in 57.5%, 21.3%,13.3%, and 26.8% of the patients, respectively.	Usually bilateral, but can be bilateral in 4.3% of the patients.
Tumour Markers	cancer-125	a-fetoprotein and b-hCG
Endocrine manifestations	No	Resulting from hormone production
Frequency of five-year survival	The global from the 44% depends on the stage of the tumour	100% for dysgerminomas and 85% for other types of germ tumours.

^*50% of all cases occur in adult women of >65 years old.