Question to the Department of Health and Social Care:

To ask His Majesty's Government to what extent they have evaluated in the NHS-Galleri research trial the possibility that patients with small tumours will not be readily detected when circulating tumour DNA is used for diagnosis, leading to poor utility for cancer screening.

The Department has not made any formal evaluations, as the NHS-Galleri research trial is currently still ongoing. The trial is planned to conclude in 2025 with interim results expected during 2024, and final results anticipated in 2026.