title: Application of hyperosmotic agent to determine gastric cancer with optical coherence tomography ex vivo in mice.
abstract: Noninvasive tumor imaging could lead to the early detection and timely treatment of cancer. Optical coherence tomography (OCT) has been reported as an ideal diagnostic tool for distinguishing tumor tissues from normal tissues based on structural imaging. In this study, the capability of OCT for functional imaging of normal and tumor tissues based on time- and depth-resolved quantification of the permeability of biomolecules through these tissues is investigated. The orthotopic graft model of gastric cancer in nude mice is used, normal and tumor tissues from the gastric wall are imaged, and a diffusion of 20% aqueous solution of glucose in normal stomach tissues and gastric tumor tissues is monitored and quantified as a function of time and tissue depth by an OCT system. Our results show that the permeability coefficient is (0.94+/-0.04)x10(-5) cms in stomach tissues and (5.32+/-0.17)x10(-5) cms in tumor tissues, respectively, and that tumor tissues have a higher permeability coefficient compared to normal tissues in optical coherence tomographic images. From the results, it is found that the accurate and sensitive assessment of the permeability coefficients of normal and tumor tissues offers an effective OCT image method for detection of tumor tissues and clinical diagnosis.
authors.affiliation: South China Normal University, Key Laboratory of Laser Life Science of Ministry of Education, Lab of Photonic Chinese Medicine, Guangzhou, Guangdong 510631, China.
authors.forename: Honglian
authors.initials: H
authors.lastname: Xiong
authors.forename: Zhouyi
authors.initials: Z
authors.lastname: Guo
authors.forename: Changchun
authors.initials: C
authors.lastname: Zeng
authors.forename: Like
authors.initials: L
authors.lastname: Wang
authors.forename: Yonghong
authors.initials: Y
authors.lastname: He
authors.forename: Songhao
authors.initials: S
authors.lastname: Liu
mesh_terms: D000818:Animals; D045744:Cell Line, Tumor; D003287:Contrast Media / Q000008:administration & dosage; D005947:Glucose / Q000008:administration & dosage; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D009997:Osmotic Pressure / Q000187:drug effects; D013274:Stomach Neoplasms / Q000473:pathology*; D041623:Tomography, Optical Coherence / Q000379:methods*
chemical_list: D003287:Contrast Media; D005947:Glucose