Fertility Preservation in Children With Solid Tumors: Detection of Residual Disease by a Sensitive Method

Shown exactly as written on ClinicalTrials.gov. Your oncologist is the right person to judge whether it fits your situation.

Inclusion Criteria:

* Women of any age diagnosed with a benign cyst requiring laparoscopy may be included.
* Men of any age diagnosed with a non-obstructive azoospermia may be included.
* Prepubertal girls and boys diagnosed with neuroblastoma or Ewing sarcoma during infancy may be included.
* Capable of providing written informed consent to participate in the research study
* Affiliated with a social welfare service.
* For prepubertal patients, written informed consent to participate in the research study must be provided by their parents or legal guardians.

Exclusion Criteria:

* None