Question to the Department of Health and Social Care:

To ask the Secretary of State for Health, how many eggs are required before the research to enable (a) pro-nuclear transfer and (b) maternal spindle transfer is considered safe for treatment in women.

There is no set number of eggs required for use before the research to enable pro-nuclear transfer and maternal spindle transfer can be considered safe for use in the treatment of women.

The Human Fertilisation and Embryology Authority has advised that it has made no estimate of the number of eggs that would be required annually for pro-nuclear transfer and maternal spindle transfer.