Table 1. Fertility preservation techniques.
Technique	Advantage	Disadvantage	Practice
IVF and embryo cryopreservation	Most effective	COS Requires partner or donor Requires time for stimulation	Standard
Mature oocyte cryopreservation	Effective Does not require partner or donor	COS Requires time for stimulation Few pregnancies reported	Standard
Immature oocyte cryopreservation and in vitro maturation	No delay in treatment No COS Does not require partner or donor	Few pregnancies reported	Experimental
Ovarian cortex cryopreservation	No COS No delay in treatment Suitable for prepubertal girls	Requires surgery Few pregnancies reported Potential risk of cancer grafts	Experimental
Ovarian supression with GnRH	No COS No delay in treatment Non invasive	Effectiveness not proven Climateric symptoms	Not proven
COS:Controlled ovarian stimulation