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    Evaluation of metabolic parameters of microsatellites stable and instable colorectal cancer patients via PET/CT
    (2024) Tuzcu, Şadiye Altun; Çetin, İlbey Erkin; Güzel, Fatih; Çetinkaya, Erdal; Taşdemir, Bekir; Büyükbayram, Hüseyin
    Aims: Microsatellite instability has been determined as an important indicator in selecting chemotherapy drugs in colorectal cancer. Within the scope of this research, we aimed to elucidate the pathology reports and determine whether the metabolic parameters detected by PET/CT differ in MSI-positive and negative patients. Methods: A total of 35 patients were analyzed retrospectively. The patient population consisted of patients who applied to the Nuclear Medicine Department with a diagnosis of colon or rectum cancer, underwent PET/CT imaging for staging purposes, and were operated on. Results: A total of 35 colon or rectum cancer patients were included in this retrospective analysis. When microsatellite instability was analyzed among the patients, it was found that female patients comprised 4 microsatellite instability-positive and 16 microsatellite instability-negative individuals. On the other hand, 5 of the males were microsatellite instability positive, and 10 were microsatellite instability negative. The mean SUVmax value was 16.4±8.2, SUVmean was 8.1±1.9, TLG was 392.4±520.8, and MTV was 26.5±25.4 in the microsatellite instability-positive individuals. On the other hand, the mean SUVmax value was 22.7±9.7, SUVmean was 5.2±2.2, TLG was 316.4±325.7, and MTV was 21.7±21.7 in the microsatellite instability-negative individuals. Conclusion: With the advancement of image analysis technology, MTV, and TLG, volumetric indexes derived from 18F-FDG PET have been proposed for risk stratification of cancer patients. Regarding the outcomes of this research, the semiquantitative and metabolic parameters obtained by PET/CT are not different in colorectal cancer cases with instable and stable microsatellites.
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    Öğe
    Evaluation of metabolic parameters of microsatellites stable and instable colorectal cancer patients via PET/CT
    (MediHealth Academy Yayıncılık, 2024) Tuzcu, Şadiye Altun; Çetin, İlbey Erkin; Güzel, Fatih; Çetinkaya, Erdal; Taşdemir, Bekir; Büyükbayram, Hüseyin
    Aims: Microsatellite instability has been determined as an important indicator in selecting chemotherapy drugs in colorectal cancer. Within the scope of this research, we aimed to elucidate the pathology reports and determine whether the metabolic parameters detected by PET/CT differ in MSI-positive and negative patients. Methods: A total of 35 patients were analyzed retrospectively. The patient population consisted of patients who applied to the Nuclear Medicine Department with a diagnosis of colon or rectum cancer, underwent PET/CT imaging for staging purposes, and were operated on. Results: A total of 35 colon or rectum cancer patients were included in this retrospective analysis. When microsatellite instability was analyzed among the patients, it was found that female patients comprised 4 microsatellite instability-positive and 16 microsatellite instability-negative individuals. On the other hand, 5 of the males were microsatellite instability positive, and 10 were microsatellite instability negative. The mean SUVmax value was 16.4±8.2, SUVmean was 8.1±1.9, TLG was 392.4±520.8, and MTV was 26.5±25.4 in the microsatellite instability-positive individuals. On the other hand, the mean SUVmax value was 22.7±9.7, SUVmean was 5.2±2.2, TLG was 316.4±325.7, and MTV was 21.7±21.7 in the microsatellite instability-negative individuals. Conclusion: With the advancement of image analysis technology, MTV, and TLG, volumetric indexes derived from 18F-FDG PET have been proposed for risk stratification of cancer patients. Regarding the outcomes of this research, the semiquantitative and metabolic parameters obtained by PET/CT are not different in colorectal cancer cases with instable and stable microsatellites.
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    Öğe
    Exploring 18F-FDG uptake patterns in liver, spleen, and bone marrow: Implications for inflammatory and infectious conditions
    (2024) Tuzcu, Şadiye Altun; Çetinkaya, Erdal; GÇzel, Fatih; Çetin, İlbey Erkin; Mete, Ümit; Argın, Eşref; Taşdemir, Bekir
    OBJECTIVE: This study aimed to explore the relationship between fluorine-18-fluorodeoxyglucose (18F-FDG) uptake in the liver, spleen, and bone marrow and inflammatory markers such as c-reactive protein (CRP), albumin, and erythrocyte sedimentation rate (ESR) in patients undergoing positron emission tomography/computed tomography (PET/CT) imaging for cancer diagnosis. SUBJECTS AND METHODS: This retrospective cross-sectional study included a total of 708 patients with a diagnosis of malignancy. Fluorine-18-FDG PET/CT images acquired between January 2021 and December 2022. Exclusion criteria comprised prior chemotherapy, radiotherapy, hematological malignancies, or liver/spleen tumors. Statistical analysis included correlation analysis, univariate, and multivariate regression analysis. RESULTS: C-reactive protein levels demonstrated a significant positive correlation with 18F-FDG uptake in the spleen (r=0.104, P=0.006) and bone marrow (r=0.112, P=0.003). Albumin showed a negative correlation with liver 18F-FDG uptake (r=-0.220, P<0.001). Regression analysis revealed ESR's impact on spleen-to-liver (P=0.023) and bone marrow-to-liver (P=0.012) 18F-FDG uptake. CONCLUSION: This study demonstrates the association between inflammatory markers and 18F-FDG uptake in liver, spleen and bone marrow. C-reactive protein and ESR showing significant correlations with spleen and bone marrow 18F-FDG uptake, and albumin correlated with liver 18F-FDG uptake negatively. Erythrocyte sedimentation rate had significant impact on spleen and bone marrow 18F-FDG uptakes. These findings suggest the potential of 18F-FDG PET/CT in diagnosing inflammatory conditions, warranting further investigation into its clinical implications.