This is because clinicians face considerable challenges in visually identifying oral neoplasia

at an early stage, leading to many diagnoses occurring late in neoplasia progression Natural Product Library ic50 [3] and [4] Currently disease progression, surgical margins, metastasis and extent of invasion are decided based on diagnostic methods such as X-rays, CT scans or PET images carried out prior to surgery [5] and [6]. These techniques, though clinically useful, have safety concerns, cannot predictably detect tumors less than 1 cm in diameter (equating to greater than 1 million cancerous cells), and cannot be generated in real time to guide the surgeon intra-operatively. In recent years, there have been a number of scientific approaches to the problem of oral lesion detection (i.e. ViziLite, VELscope, Trimira, OralCDx, etc.). However, the effectiveness of these technologies is inconsistent [5] and [7].

The literature suggests that these modalities fail to noticeably improve the detection of oral carcinomas from standard head and neck examinations routinely performed by physicians [7]. A major reason for the inconsistency, Adriamycin poor specificity and inability to detect earlier stage cancer is the oversight of these technologies to target advanced stage anatomical changes instead of early stage molecular level alterations. Optical molecular imaging provides a non-invasive, in vivo, rapid and cost effective method to detect early molecular level changes in neoplastic tissue, based on its ability to specifically analyze molecules of interest. More importantly, optical molecular imaging can be performed with minimum training, increasing its potential to be used in the general physicians’ office. Possible targets for optical imaging are the glycoproteins and glycolipids on the cell surface. These cellular glycomolecules are completed during the post-translational event called glycosylation, which is known to be abnormal in human disease progression Protirelin such as carcinogenesis and

metastasis [8], [9] and [10]. This irregular glycosylation results in varying glycosyl residues on the cell surface during pathological changes, highlighting the clinical importance of this alteration as a potential target by which to detect oral cancer. A prime example of aberrant glycosylation in carcinogenesis is the overexpression of sialyl Lewis A and sialyl Tn antigen in cancers of the pancreas, colon, stomach and esophagus [11] and [12]. Moreover, increased sialytransferases and sialic acid content on cell glycoconjugates has long been linked to oral cancer and malignant transformation [13] and [14]. Increased sialic acid content can reach up to 10e+09 sialic acid residues per tumor cell [15]. Further, Rajpura et al. showed statistically significantly higher levels of sialic acid in oral cancer patients compared to normal patients (63.70mg/dl versus 30.