A Menlo Park biotech firm said Friday that federal regulators will let it proceed with the world’s first human test of a treatment made from embryonic stem cells, a much-anticipated but controversial study of patients with spinal cord injuries that had been placed on hold for nearly a year because of safety concerns.

If the treatment from Geron works, it ‘would be revolutionary,’ said Dr. Richard Fessler, a neurological surgeon at Northwestern University, who will lead the study of a stem-cell treatment designed to be injected into patients with spinal injuries to restore their motor function. ‘The therapy would provide a viable treatment option for thousands of patients who suffer severe spinal cord injuries each year.’

Geron has spent 15 years and more than $150 million to develop the treatment, and ‘getting it into a clinical trial, just by itself, is a big deal,’ added Fessler, who has no financial ties to the company.

Many people hope that human embryonic stem cells, which can turn into any type of tissue in the body, could prove useful for everything from generating organs for transplants to helping test drugs on numerous diseases. But because the cells are derived from discarded 3- to-5-day-old embryos, their use […]