Question to the Department of Health and Social Care:

To ask His Majesty's Government, further to the Written Statement by Lord Kamall on 5 January 2022 (HLWS503), how many patients to date have been licensed by the Human Fertilisation and Embryology Authority as eligible for mitochondrial donation treatment in the UK; how many embryos in total have been produced using (1) pronuclear transfer, and (2) 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) has 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 (a) pronuclear transfer and (b) spindle-chromosomal complex transfer.

Source: HFEA

Notes:

1. The data is as recorded by the HFEA on 4 June 2023 so 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.