In May 2008 in the abortion amendments to the Human Fertilisation and Embryology Bill (now Act), Claire Curtis-Thomas voted for the abortion time limit to be lowered to 12 weeks against scientific and medical consensus which is currently 24 weeks. After four separate parliamentary votes on varying time limits, the majority of MPs voted to keep the abortion time limit at 24 weeks, in keeping with scientific and medical consensus, hence no abortion amendments were added to the bill.
Curtis-Thomas also campaigned alongside Geraldine Smith MP to promote links between abortion and an increased risk from breast cancer. The position has been promoted by "pro-life" groups in the United States, despite scientific and medical consensus concluding that there is no causative link between induced abortion and breast cancer after numerous studies. (See also:Abortion-breast cancer hypothesis)