Improving Stem Cell Clinical Trial Design and Conduct: Development of a Quality Assessment Tool for Stem Cell Clinical Trials

Table 1

Basic characteristics of included stem cell studies for validation of quality assessment tool.

Items of characteristics	Number of trials	Proportion (%)
Total	37	100.00
Trials status
Complete or stop recruiting	32	86.49
Terminated	3	8.11
Unknown	2	5.41
Phase
Phase 1	6	16.22
Phase 2	11	29.73
Phase 1/2	14	37.84
Phase 3	2	5.41
Phase 2/3	2	5.41
Unknown	2	5.41
Sponsor type
Investigator-initiated trial	23	62.16
Industry-sponsored trial	14	37.84
Number of publications
1	21	56.76
2~3	12	32.43
≥3	4	10.81
Cell type
Pluripotent stem cells	3	8.11
Somatic stem cells	34	91.89