ABSTRACT
Despite advances in immunotherapy for the treatment of cancers,not all patients can benefit from programmed cell death ligand 1(PD-L1)immune checkpoint blockade therapy.Anti-PD-L1 therapeutic effects reportedly correlate with the PD-L1 expression level;hence,accurate detection of PD-L1 expression can guide immunotherapy to achieve better therapeutic effects.Therefore,based on the high affinity antibody Nb109,a new site-specifically radiolabeled tracer,68Ga-NODA-cysteine,aspartic acid,and valine(CDV)-Nb109,was designed and synthesized to accurately monitor PD-L1 expression.The tracer 68Ga-NODA-CDV-Nb109 was obtained using a site-specific conjugation strategy with a radiochemical yield of about 95％and radiochemical purity of 97％.It showed high affinity for PD-L1 with a dissociation constant of 12.34±1.65 nM.Both the cell uptake assay and positron emission tomography(PET)imaging revealed higher tracer uptake in PD-L1-positive A375-hPD-L1 and U87 tumor cells than in PD-L1-negative A375 tumor cells.Meanwhile,dynamic PET imaging of a NC1-H1299 xenograft indicated that doxorubicin could upregulate PD-L1 expression,allowing timely interventional immunotherapy.In conclusion,this tracer could sensitively and dynamically monitor changes in PD-L1 expression levels in different cancers and help screen patients who can benefit from anti-PD-L1 immunotherapy.
ABSTRACT
Objective To explore the effect of specific labeling method in improving the mixed placing of medical waste in neonatal intensive care unit(NICU).Methods Medical waste classification of 34 trash cans in the NICU of a hospital between July and December 2014 were investigated,July-September was pre-implementation phase of spe-cific labeling,October-December was post-implementation phase,mixed placing of medical waste between pre-and post-implementation phase was compared.Results A total of 504 cases of medical waste classification in NICU were investigated,252 cases respectively in pre-and post-implementation phase,74 cases of mixed placing were found. Mixed placing rates before implementing specific labeling was higher than after implementing (25.40%[64/252]vs 3.97%[10/252],χ2 =46.187,P <0.001 );before implementing specific labeling,57 cases of infectious waste and non-infectious waste were mixed placing,after implementing specific labeling,only 8 cases of infectious waste and non-infectious waste were mixed placing.Mixed placing were mainly performed by trainees for in-service training and interns,accounting for 39.06% before implementing and 50.00% after implementing.Conclusion The specific labeling for standardizing and managing of medical waste can improve the classification of medical waste in NICU, significantly improve the compliance of all kinds of health care workers to the standard handling of medical waste.