Table 1.

In vitro anti-tumor effect of curcumin and its analogues against SLMT-1, HKESC-2, and KYSE-270 ESCC cell lines

	IC50 (μM)
	SLMT-1	HKESC-2	KYSE-270
Curcumin	14.25±0.36	13.15±0.49	14.43±0.11
SSC-3	2.75±0.44	1.75±0.05	0.96±0.04
SSC-5	1.22±0.41	0.47±0.06	1.21±0.18
SSC-6	> 5	2.57±1.07	4.52±0.91
SSC-8	2.98±1.18	2.33±1.04	2.98±0.81
SSC-9	3.13±0.59	1.82±0.16	1.86±0.29
SSC-10	2.39±1.13	1.82±0.16	1.61±0.18
SSC-19	1.53±0.43	1.18±0.55	1.24±0.12
SSC-20	3.16±0.63	1.67±0.42	3.56±0.10

ESCC, esophageal squamous cell carcinoma.