 In 1828 he set up a small dispensary at 16 Greville Street, Hatton Garden, Holborn, which was named the London General Institution for the Gratuitous Cure of Malignant Diseases.This was later constituted as the Royal Free Hospital, and moved to the Gray's Inn Road in the 1840s.A few years later, Marsden turned his attention to cancer sufferers and, in 1851, set up another small establishment in Cannon Row, Westminster.