We are currently confirming our findings by studying the correlation between the sensitivity of patients’ glioblastoma cells and the patient’s survival. Poster No. 64 Development Citarinostat of a New Brain Metastasis Model in the Nude Rat Jian Wang1, Inderjit Kaur Daphu 1 , Paal-Henning Pedersen2, Hrvoje Miletic1, Randi Hovland3, Sverre Mørk4, Rolf Bjerkvig1, Frits Thorsen1 1 Department of Biomedicine, University of Bergen, Bergen, Norway, 2 Department of Neurosurgery, Haukeland University Hospital, Bergen, Norway, 3 Center for Medical Genetics and Molecular Medicine, Haukeland University Hospital,

Bergen, Norway, 4 Department of Pathology, Haukeland University Hospital, Bergen, Norway Brain metastasis is a common cause of mortality in cancer patients, and associated with poor prognosis. In order to better understand the complex metastatic process and Apoptosis inhibitor the interaction between metastases

and the microenvironment, we developed a new animal model, where human brain metastases were xenografted into the brains of immunodeficient rats. Tumor take was achieved in 7 out of 9 human brain metastases implanted. By MR imaging, the animal brain metastases showed similar radiological features as observed clinically. Histological comparisons between the primary tumors from the patients, the patient brain metastases and the xenografted brain metastases showed similar growth patterns. An immunohistochemical PRKD3 study showed similar marker expressions between the patient tumors and the corresponding animal brain tumors. A DNA copy Androgen Receptor pathway Antagonists number analysis showed several chromosomal deletions and amplifications, but only one change, gain of 2q, was exclusively found in the animal brain metastases. In conclusion, we have developed a representative in vivo model for studying metastatic brain cancer,

which will be used to assess responses to treatment. This model was refined by establishing a cell line (H1) from one of the brain metastases (primary: melanoma). In order to follow systemic spread of the cell line in vivo, we generated two new cell lines by transfecting with either dsRed or H1 GFP-Luc reporter genes. The transgene-positive cells were selected by fluorescence activated cell sorting to obtain homogenously fluorescent cell lines. A pilot study showed that the H1/dsRed cells were tumorigenic when implanted intracranially and subcutaneously in matrigel, in nod/SCID eGFP positive mice. A bioluminescence assay using optical imaging on H1/GFP-Luc cells was done in vitro, which showed a strong luciferase activity in the cells. Currently the H1/GFP-Luc cells is injected intracardially, to study the ability of systemic homing of these cells into the brain of nod/SCID mice. Poster No.