[en] The aim of the present study was to investigate asialoglycoprotein receptor (ASGP-R) status in tumor-bearing livers and early after their sectorial resection employing ^99mTc-DTPA-galactosyl human serum albumin (^99mTc-GSA) dynamic SPECT. Ten normal liver controls and 44 liver tumor patients who underwent sectorial hepatectomy were included in the study. ^99mTc-GSA dynamic SPECT study was performed 7±3 d before (pre-operative) and 34±13 d after surgery (post-operative) in liver tumor patients. Pre- and post-operative parameters including hepatic functional volume and ⁹⁹mTc-GSA clearance of unit hepatic functional volume, representing ASGP-R concentration, were measured. The sum of functional volume of the sectors uninvolved in hepatectomy was defined as residual functional volume. Subsequently, post-operative change in functional volume (the ratio of post-operative to residual functional volume), post-operative change in ⁹⁹mTc-GSA clearance of unit hepatic functional volume (the ratio of post- to pre-operative ^99mTc-GSA clearance of unit hepatic functional volume) and percent resection of functional volume were calculated. Pre-operative ^99mTc-GSA clearance of unit hepatic functional volume in tumor-bearing livers was significantly lower than that in non-tumor bearing control liver. The ratio of post- to pre-operative ^99mTc-GSA clearance of unit hepatic functional volume showed marked variation from 0.57 to 2.14, which negatively correlated with the percent resection of functional volume (r=-0.58, p<0.0001). The ratio of post- to pre-operative ^99mTc-GSA clearance of unit hepatic functional volume exhibited a negative correlation with the ratio of post-operative to estimated residual functional volume (r=-0.67, p<0.0001). ASGP-R concentration is reduced in the presence of liver tumor. ASGP-R concentration reveals variable changes early after sectorial resection; the change negatively correlates with percent resection of hepatic functional volume. Post-operative change in ASGP-R concentration negatively correlates with change in functional volume. (author)