ESCC.	Esophageal squamous cell carcinoma
PPT	Picropodophyllotoxin
IGF-1R	Insulin-like growth factor 1 receptor
MAPK	Mitogen-activated protein kinase
JNK	c-Jun N-terminal kinase
ROS	Reactive oxygen species
ER	endoplasmic reticulum
MTT	3-(4,5-dimethylthiazol-2-yl)-2,5 diphenyltetrazolium bromide
DMSO	Dimethyl sulfoxide
7-AAD	7-Aminoactinomycin D
CHOP	C/EBP homologous protein
GRP78	78-kDa glucose-regulated protein
DR	Death receptor
MMP	Mitochondrial membrane potential
Apaf-1	apoptotic protease activating factor-1
c-PARP	cleaved Poly (ADP-Ribose) Polymerase
cyto C	cytochrome C
FBS	fetal bovine serum
PBS	phosphate-buffered saline
p	phosphor
RT	Room temperature
SD	standard deviation