Male Infertility — Use of Testicular Spermatozoa in Non-azoospermic Patients
Citation(s)
Donoso P, Tournaye H, Devroey P Which is the best sperm retrieval technique for non-obstructive azoospermia? A systematic review. Hum Reprod Update. 2007 Nov-Dec;13(6):539-49. Epub 2007 Sep 24. Review.
Kang YN, Hsiao YW, Chen CY, Wu CC Testicular sperm is superior to ejaculated sperm for ICSI in cryptozoospermia: An update systematic review and meta-analysis. Sci Rep. 2018 May 18;8(1):7874. doi: 10.1038/s41598-018-26280-0.
Kendall Rauchfuss LM, Kim T, Bleess JL, Ziegelmann MJ, Shenoy CC Testicular sperm extraction vs. ejaculated sperm use for nonazoospermic male factor infertility. Fertil Steril. 2021 Oct;116(4):963-970. doi: 10.1016/j.fertnstert.2021.05.087. Epub 2021 Jul 4.
Interventional studies are often prospective and are specifically tailored to evaluate direct impacts of treatment or preventive measures on disease.
Observational studies are often retrospective and are used to assess potential causation in exposure-outcome relationships and therefore influence preventive methods.
Expanded access is a means by which manufacturers make investigational new drugs available, under certain circumstances, to treat a patient(s) with a serious disease or condition who cannot participate in a controlled clinical trial.
Clinical trials are conducted in a series of steps, called phases - each phase is designed to answer a separate research question.
Phase 1: Researchers test a new drug or treatment in a small group of people for the first time to evaluate its safety, determine a safe dosage range, and identify side effects.
Phase 2: The drug or treatment is given to a larger group of people to see if it is effective and to further evaluate its safety.
Phase 3: The drug or treatment is given to large groups of people to confirm its effectiveness, monitor side effects, compare it to commonly used treatments, and collect information that will allow the drug or treatment to be used safely.
Phase 4: Studies are done after the drug or treatment has been marketed to gather information on the drug's effect in various populations and any side effects associated with long-term use.
