About 2 million cells are transplanted into each patient in the treatment. They were created from iPS cells stored at Kyoto University in western Japan, according to Keio University.

In the future, the university plans to increase the number of cells to be transplanted in order to enhance the effectiveness of the treatment.

Some 5,000 people sustain spinal cord injuries every year in Japan and the number of people living with spinal cord injuries is said to exceed 150,000.