Abstract: Objective To approach the mechanism and efficacy of regional intra-arterial infusion chemotherapy with the mixture of lipid emulsion-CDDP ( LE-CDDP ) for treatment of locally advanced pancreatic cancer.Methods Twenty-four health dogs were divided into four groups ( group A,B,C, and D).The dosage of CDDP was used in 4 mg/kg/body weight for each animal.The 20%LE, as a solvent, was used in the experimental animals with 2 ml/kg/body weight ( group A ) and 1 ml/kg/body weight ( group B) , respectively.Normal sodium ( NS) as a solvent was used as control with 2 ml/kg/body weight (group C) and 1 ml/kg/body weight (group D), respectively.The LE-CDDP mixture and the NS-CDDP mixture were infused into the proximal segment of splenic artery under the DSA, with transfemoral arterial approach.Blood samples were collected after infusion at 0,3,5,10,20,30,40,50,60 min and the tissues were obtained after the 60 min′s blood sample was collected.Blood samples, absorbent gland in peripancreas, liver, spleen, kidney, heart, portal vein, the superior segment of jejunal and pancreas and parapancreatic tissues were obtained for CDDP concentration analysis and histopathologic examination. Results The values of the area under curve ( AUC ) , the incipient serum concentration ( C0 ) and the elimination half-life ( t1/2 ) of the serum CDDP concentration-time curve in four groups were A ( 54.5 ± 10.1)%,(2.6 ±0.5 ) mg/L, ( 16.7 ±3.6 ) min;B ( 18.3 ±6.0 )%, ( 1.5 ±0.2 ) mg/L, ( 47.9 ± 11.1) min;C (116.7 ±20.6)%, (6.5 ±0.4) mg/L, (10.5 ±2.8) min and D (126.6 ±30.7)%, (5.5 ±0.4) mg/L, (10.1 ±3.1) min, respectively.There were significant difference among these four groups (F(AUC) =42.42, F(C0) =249.61, F(t1/2) =12.48, P<0.01).The values of AUC and C0 in the group A were significantly lower than those in the group C (t(AUC) =6.64,t(C0) =16.34, P<0.01), and the corresponding values in the group B being also significantly lower than those in the group D (t(AUC) =8.49, t(C0) =22.30, P<0.01).The value t1/2 in the group A was significantly longer than that of in the group C (t=3.36, P<0.01), and that of group B was also significantly longer than that of group D (t=3.71, P<0.01).The values of AUC and C0 in the group B were significantly lower than those in the group A (t(AUC) =7.57, t(C0) =5.48, P<0.01), and the value t1/2 in the group B was significantly longer than that in the group A (t=3.22, P<0.05).The concentrations of the left lobe and horn of pancreas were higher in the group B (0.18, 0.18 mg/L) than those in the group A (0.05, 0.05 mg/L)(t=2.52, 2.73, P<0.05 ) .The tissue CDDP concentration of the right lobe of pancreas and spleen were no significant difference between group A ( 0.11, 0.29 mg/L ) and group B ( 0.07, 0.24 mg/L ) ( P >0.05 ) . Perivascular lymphocytic and neutrophilic infiltration, congestion and hemorrhage were found in the pancreas, parapancreatic absorbent gland, liver and spleen in the group A and group B.The micro-particles of intralipid were present in the capillary vessel of these tissues.No specific pathological changes were found in other groups and organs.Conclusions The regional intra-arterial infusion with LE-CDDP mixture could increase the pancreatic CDDP concentration, meanwhile, it also could decrease the serum CDDP concentration.The more of the CDDP concentration in the LE-CDDP mixture, the more CDDP concentration at the pancreatic tissue accordingly.