Completed OBSERVATIONAL NCT00548977

Genetic Studies Spermatogenic Failure

Sponsor: National Cheng-Kung University Hospital

Conditions Azoospermia Male Infertility Oligospermia

Interventions Drawing blood to study genetic polymorphism

Updated 12 times since 2017 Last updated: Oct 24, 2007 Started: Jan 31, 2001 Completion: Feb 28, 2005

This information is for research purposes only and is not medical advice. Consult a healthcare provider before making any medical decision.

A observational or N/A phase clinical study on Azoospermia and Male Infertility, this trial is completed. The trial is conducted by National Cheng-Kung University Hospital and has accumulated 12 data snapshots since 2001. Longitudinal tracking of this trial contributes to a broader understanding of treatment development timelines.

Status Flow

Change History

12 versions recorded

Dec 2025 — Present [monthly]

Completed
Sep 2025 — Dec 2025 [monthly]

Completed
Sep 2024 — Sep 2025 [monthly]

Completed
Jul 2024 — Sep 2024 [monthly]

Completed
Dec 2021 — Jul 2024 [monthly]

Completed

▶ Show 7 earlier versions

Jan 2021 — Dec 2021 [monthly]

Completed
Nov 2020 — Jan 2021 [monthly]

Completed
Jun 2018 — Nov 2020 [monthly]

Completed
May 2018 — Jun 2018 [monthly]

Completed
Apr 2018 — May 2018 [monthly]

Completed

Phase: NA → None
Aug 2017 — Apr 2018 [monthly]

Completed NA
Jan 2017 — Aug 2017 [monthly]

Completed NA

First recorded

Jan 2001

Trial started

Per CT.gov start date — pre-dates our first snapshot

Eligibility Summary

No eligibility information available.

Contact Information

Sponsor contact:

National Cheng-Kung University Hospital

Data source: National Cheng-Kung University Hospital

For direct contact, visit the study record on ClinicalTrials.gov .

Study Locations

• Tainan, Taiwan