13:30 | | IntroductionJanio Szklaruk MD Anderson Cancer Center |
13:42 | 0547.
| Detecting IDH1 Mutations in Gliomas: Insights from J-Difference Editing MEGA-PRESS 1H-MRS Jia Guo1,2, Angeliki Mela3, Zhonghui Qie2, Yanting Yang2, Aayushi Mahajan4, Nelson Humala4, and Peter D Canoll3 1Department of Psychiatry, Columbia University, New York, NY, United States, 2Zuckerman Institute, Columbia University, New York, NY, United States, 3Department of Pathology and Cell Biology, Columbia University, New York, NY, United States, 4Department of Neurological Surgery, Columbia University, New York, NY, United States Keywords: Tumors (Pre-Treatment), Tumor, IDH1 mutation, glioma, MEGA-PRESS, 2-Hydroxyglutarate, glutamate, GABA, glutathione Motivation: Detecting isocitrate dehydrogenase 1 (IDH1) mutations via in vivo MRI can significantly aids glioma diagnosis and treatment strategies. Goal(s): To investigates the use of MEGA-PRESS sequences to non-invasively charaterize the metabolic profile of IDH1 mutation glioma.
Approach: We measured 2-hydroxyglutarate (2HG), glutamate+glutamine (GLX), GABA and glutathione (GSH) inside the glioma from an IDH1(R132H)-mutant and an IDH1-wildtype murine models.
Results: The results unveil distinctive metabolic changes in IDH1 mutation tumors, including elevated 2HG, GLX/GABA ratio, and reduced GSH. These findings offer potential biomarkers for precise diagnosis and therapeutic strategies, highlighting the significant role of MEGA-PRESS in the studies of glioma. Impact: The study identifies 1H MRS-based biomarkers for non-invasive detection of IDH1 mutation tumors using the MEGA-PRESS sequence. It provides insights into metabolic changes and neurochemical imbalances, aiding early diagnosis, treatment guidance, and monitoring, thus advancing precision oncology. |
13:54 | 0548.
| 1H MR spectroscopy and IVIM-DWI to evaluate the effect of a choline kinase inhibitor and temozolomide therapy in a mouse model of glioblastoma Tareq Alrashidi*1, Sourav Bhaduri*2,3, Elisabeth Non Gash1, Mohesh Moothanchery1, Christopher Ball1, Mahon Maguire1, Lorenzo Ressel4, and Harish Poptani1 1University of Liverpool, Liverpool, United Kingdom, 2Symbiosis Centre for Medical Image Analysis, Symbiosis International (Deemed University), Pune, India, 3Institute for Advancing Intelligence (IAI), TCG CREST, Kolkata, India, 4Department of Veterinary Anatomy Physiology and Pathology, University of Liverpool, Chester, United Kingdom Keywords: Small Animals, Cancer, MRS, IVIM, treatment response Motivation: There is a lack of comprehensive understanding regarding the impact of choline kinase inhibition and standard chemotherapy on preclinical GBM models. Goal(s): The primary goal of this study was to elucidate the treatment response mechanism in a preclinical GBM mouse model. Approach: MRS and IVIM-DWI were used for monitoring metabolic and microstructural changes in a preclinical GBM model by single or combination therapy with a choline kinase inhibitor and TMZ. Results: Our findings indicate that the combination therapy is the most effective treatment regimen. This study contributes to a better understanding of treatment response mechanisms and underscores the potential of non-invasive MRI methods. Impact: Targeting ChoKα
inhibition and the damage of DNA replication (TMZ) promises to be an
alternative in the treatment of GBM. This research also highlights the importance of MRS
and IVIM-DWI as promising non-invasive methods to assess therapeutic effects on
GBM. |
14:06 | 0549.
| Imaging glutamine utilization in a prostate cancer xenograft model Yuki Hodo1, Caitlin M Tressler1, Behnaz Ghaemi1, Aliyah S Webster2, Yuguo Li3, Martin G Pomper1, Jeff WM Bulte1, Peter CM van Zijl1,3, and Aline Thomas1 1Johns Hopkins University, Baltimore, MD, United States, 2Spelman College, Atlanta, GA, United States, 3Kennedy Krieger Institute, Baltimore, MD, United States Keywords: Biomarkers, Cancer, Prostate, Metabolism Motivation: MRI agents that can monitor abnormal glutamine utilization, a hallmark of many aggressive cancers, are not clinically available. Goal(s): We investigated the utility of glutamine as a chemical exchange saturation transfer (CEST) agent to evaluate its utilization. Approach: Phantoms revealed contrast differences between glutamine and its metabolic products. Dynamic CEST images (in vivo) were acquired in 2 prostate cancer xenograft models after intravenous injection of glutamine. MALDI (matrix-assisted laser desorption/ionization) images of the same tumors (ex vivo) were collected for validation. Results: CEST and MALDI images could distinguish prostate tumors derived from cell lines with known differences in glutamine utilization. Impact: The potential of CEST (chemical exchange saturation
transfer) MRI to evaluate glutamine utilization was evaluated in preclinical prostate
cancer models (DU-145 and LNCaP). CEST enhancement images upon infusion of
glutamine could distinguish tumors that differed in glutamine utilization. |
14:18 | 0550.
| Predictions of Human Prostate Cancer with MRS Metabolomics from Biopsies After More Than 5-Year Follow-Up Ella Zhang1, Jiaqi Lu1, Jonathan X. Zhou1, Chin-lee Wu1, Adam S. Feldman1, and Leo L. Cheng1 1Massachusetts General Hospital, Harvard Medical School, Boston, MA, United States Keywords: Prostate, Cancer, Metabolomics, metabolomic imaging, nuclear magnetic resonance, spectroscopy, prostate cancer, MRI-US fusion, biopsy Motivation: Evaluations of prostate cancer (PCa) with traditional transrectal ultrasound (TRUS) and multiparametric MRI-ultrasound (mpMRI-US) fusion biopsies may produce false-positives or false-negatives, thereby preventing optimal and timely treatments. Goal(s): To evaluate PCa metabolomics from TRUS and fusion biopsy cores using magnetic resonance spectroscopy (MRS) to identify potential metabolomic biomarkers for better characterization of PCa. Approach: Using ex vivo MRS, we measured 432 prostate biopsy cores from patients suspicious of PCa between 4/2006 and 10/2018. Results: MRS metabolomics could differentiate between benign and malignancy, reflect malignant status from benign cores, and allowed for predictions of future PCa from benign biopsies. Impact: Our results demonstrate that MRS-based metabolomic evaluations have the potential to detect PCa years earlier than standard TRUS and fusion biopic techniques, and improve PCa active surveillance based on prostate biology. |
14:30 | 0551.
| The Role of Quantitative Imaging for Early Detection of Prostate Cancer Progression in Patients on Active Surveillance Isabella M Kimbel1, Veronica Wallaengen1, Evangelia I. Zacharaki1, Adrian L. Breto1, Ahmad Algohary1, Sandra M. Gaston1, Oleksandr N. Kryvenko2, Patricia Castillo3, Matthew C. Abramowitz1, Alan Pollack1, Sanoj Punnen4, and Radka Stoyanova1 1Radiation Oncology, University of Miami, Miami, FL, United States, 2Pathology, University of Miami, Miami, FL, United States, 3Radiology, University of Miami, Miami, FL, United States, 4Urology, University of Miami, Miami, FL, United States Keywords: Prostate, Prostate Motivation: Patients on Active Surveillance (AS) for prostate cancer have a high risk of cancer progression to treatment. There is a need for additional tools to risk stratify AS patients. Goal(s): To evaluate the Habitat Risk Score (HRS) method for automatic identification of lesions for early detection of AS progressors in a prospective trial. Approach: HRS was assessed in patients that progressed in the 1st, 2nd or 3rd year of AS. Results: In 40% of the patients, HRS identified a dominant lesion that was not targeted during biopsy. The study illustrates the quantitative power of HRS as compared to PIRADS. Impact: Integrating
Habitat Risk Score (HRS) in Active Surveillance for prostate cancer has the
potential to significantly reduce the number of surveillance biopsies. HRS
facilitates the detection of progression through assignment of robust biopsy
targets and quantification of tumor habitat changes. |
14:42 | 0552.
| A Newly Designed Hyperpolarized Aminopeptidase N Probe Sensitively Detects Early Therapeutic Responses Heterogeneously on Pancreatic Tumors Norikazu Koyasu1, Hiroyuki Yatabe2, Yoichi Takakusagi3, Yutaro Saito2, Shinske Sando2, Murali C. Krishna1, and Kazutoshi Yamamoto1 1National Institutes of Health, Bethesda, MD, United States, 2The University of Tokyo, Tokyo, Japan, 3National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan Keywords: Probes & Targets, Hyperpolarized MR (Non-Gas) Motivation: Molecular imaging is a promising methodology for diagnosing cancer and monitoring treatments by noninvasively visualizing the alternations of cancer metabolisms. Goal(s): A framework for developing novel dissolution Dynamic Nuclear Polarization(dDNP) probes is needed to overcome their limited availabilities for in vivo and clinical applications. Approach: dDNP-metabolic MRI successfully monitors therapeutic responses in spatiotemporal enzymatic activities particularly at earlier stages before the volumetric changes can be observed. Results: In this presentation, we will demonstrate a model case for a rationally designed novel dDNP probe, aminopeptidase-N(CD13), which allows us to detect heterogenetic treatment responses with an anti-angiogenic/antitumor drug, sunitinib, at the earlier stages in tumors. Impact: This work exhibits
a framework that a rationally designed hyperpolarized MR probe targeted to a highly-selective
enzymatic activity, aminopeptidase-N, leads to monitor early therapeutic
responses on cancer tissues in vivo and to observe tumor heterogeneity
in their treatment responses non-invasively. |
14:54 | 0553.
| Assessing pathological prognostic factors of resectable rectal cancer: comparison of a monoexponential model and multiple advanced DWI models Mi Zhou1, Meining Chen2, Qin Zhang3, and Hongyun Huang1 1Department of Radiology, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, China, 2MR Research Collaboration, Siemens Healthineers, Chengdu, China, 3MRI clinical application, Customer Service Department, Siemens Digital Medical Technology Co., LTD, Shanghai, China Keywords: Biomarkers, Diffusion/other diffusion imaging techniques Motivation: Diffusion-weighted imaging (DWI) can help to predicti rectal cancer prognosis; however, inconsistencies in its effectiveness necessitate exploring advanced DWI models to improve diagnostic accuracy. Goal(s): We investigated the value of the stretched exponential (SEM), fractional-order calculus (FROC), and continuous-time random-walk (CTRW) models in assessing prognostic factors for rectal cancer. Approach: This study included 181 rectal cancer patients with using traditional and advanced DWI models to explore correlations between DWI parameters and histopathological indicators. Results: The parameters of advanced DWI models were significantly correlated with histopathological prognostic factors. CTRW-α was the superior predictor for histological type and pT stage. Impact: Our
study demonstrates the value of CTRW model in predicting prognostic factors
for rectal cancer. Utilizing these noninvasive and accurate advanced DWI models
before surgery can help physicians to make appropriate surgical plan to
help patients achieve better prognosis. |
15:06 | 0554.
| Magnetic resonance imaging of macrophage response to radiation therapy Harrison Yang1, Brock Howerton2, Francesc Marti1, Reuben Adatorwovor1, and Fanny Chapelin2 1University of Kentucky, Lexington, KY, United States, 2University of California San Diego, San Diego, CA, United States Keywords: Biomarkers, Contrast Agent Motivation: Cellular response to cancer treatment is difficult to track in real time. Standard practice involves immunostaining of a biopsied tumor, but this is severely limited by a number of factors. Goal(s): Non-invasive imaging methods such as MRI could obviate the need for biopsies and serve as a biomarker of radiation therapy efficacy. Approach: This study aimed to observe macrophage response in a mouse model by use of a fluorine nanoemulsion and 19F MRI. Results: It was shown that macrophage recruitment can be quantified through MRI. Moreover, the findings suggest that macrophage response to radiation therapy is dependent on several factors including tumor origin. Impact: Our
results demonstrate the potential of 19F MRI to non-invasively track
macrophages during radiation therapy and its prognostic value with regards to
tumor growth. This technique will be extremely beneficial in
future analysis of inflammation’s role in tumor recurrence. |
15:18 | | DiscussionJanio Szklaruk MD Anderson Cancer Center, United States |