TABLE 1.

Characteristics of registered Raman spectroscopy clinical trials.

Characteristic	Category	Number	Percentage
Source register	ANZCTR	1	1.82
	Clinicaltrials.gov	24	43.64
	ChiCTR	8	14.55
	CTRI	4	7.27
	ISRCTN	2	3.64
	JPRN	11	20.00
	German clinical trial register	5	9.09
Recruitment status	Not recruiting	35	63.64
	Recruiting	20	36.36
Target size	≦50	27	49.09
	51–100	10	18.18
	101–200	9	16.36
	201–500	4	7.27
	501–1,000	3	5.45
	1,001–10,000	2	3.64
In vitro/in vivo	In vitro	31	56.36
	In vivo	24	43.64
Evaluation factors	Single	8	14.55
	Multiple (image and fingerprint)	47	85.45
Study type	Observational	30	54.55
	Diagnostic test	5	9.09
	Interventional	18	32.73
	Relative factors research	1	1.82
	Meta-analysis	1	1.82
Phase	Phase 1	1	1.82
	Phase 2	3	5.45
	Phase 3	1	1.82
	Post-market	1	1.82
	Not applicable	47	85.45
	Diagnostic new technique clinical study	2	3.64