Question to the Department of Health and Social Care:

To ask the Secretary of State for Health and Social Care, how many patients have been licensed by the Human Fertilisation and Embryology Authority as eligible for mitochondrial donation treatment in the UK; how many embryos have been produced using (a) pronuclear transfer and (b) spindle-chromosomal complex transfer; and how many embryos have been transferred to uteri pursuant to (a) pronuclear transfer and (b) spindle-chromosomal complex transfer.

The Human Fertilisation and Embryology Authority (HFEA) have advised that 32 patients have been licensed as eligible for mitochondrial donation treatment in the United Kingdom. The following table shows how many embryos have been produced during mitochondrial donation treatment and how many embryos have been transferred to uteri pursuant to clinical application in the UK of pronuclear transfer and spindle-chromosomal complex transfer.

Source: HFEA, 2023

Notes:

1. The data is as recorded by the HFEA on 4 June 2023, these figures reflect the data on this day and are likely to change over time.
2. Embryos produced during mitochondrial donation treatment are calculated as the total number of embryos developed from patient eggs and number of embryos developed from mitochondrial donor eggs.