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Our lab developed  99m Tc-NTP 15-5 radiotracer as targeting proteoglycans (PGs) for the scintigraphic imaging of joint.  This paper reports preclinical results of  99m Tc-NTP 15-5 imaging of an orthotopic model of Swarm rat chondrosarcoma (SRC).  99m Tc-NTP 15-5 imaging of SRC-bearing and sham-operated animals was performed and quantified at regular intervals after surgery and compared to bone scintigraphy and tumoural volume. Tumours were characterized by histology and PG assay.  SRC exhibited a significant  99m Tc-NTP 15-5 uptake at very early stage after implant (with tumour/muscle ratio of 1.61 ± 0.14), whereas no measurable tumour was evidenced. As tumour grew, mean tumour/muscle ratio was increased by 2.4, between the early and late stage of pathology. Bone scintigraphy failed to image chondrosarcoma, even at the later stage of study.   99m Tc-NTP 15-5 imaging provided a suitable set of quantitative criteria for the  in vivo  characterization of chondrosarcoma behaviour in bone environment, useful for achieving a greater understanding of the pathology.

A “Proteoglycan Targeting Strategy” for the Scintigraphic Imaging and Monitoring of the Swarm Rat Chondrosarcoma Orthotopic Model