Comprehensive Quality Control of the Regenerative Therapy Using Platelet Concentrates: The Current Situation and Prospects in Japan

Table 1

Classification of cell-based therapies by their potential risks.

Class	Definition	Example
1st	High-risk therapy involving cells with little or no supporting clinical evidence	ES cells, iPS cells
2nd	Medium-risk therapy involving cells currently being implemented in clinical settings	Somatic stem cells
3rd	Low-risk therapy involving cells that are subjected to limited manipulation or processing	Somatic cells

This table was translated from the original presented in the ministry’s guidance document [9]. ES cells: embryonic stem cells. iPS cells: induced pluripotent stem cells.