Molecular subtypes of breast cancer: metabolic correlation with ¹8F-FDG PET/CT.

PURPOSE: To determine whether the metabolic features of breast tumours differ among molecular subtypes. METHODS: This prospective study included 168 women diagnosed with locally advanced breast cancer. PET/CT was requested in the initial staging before neoadjuvant treatment (multicentre study, FISCAM grant). All patients underwent an ¹8F-FDG PET/CT scan with a dual time-point acquisition. Both examinations (PET-1 and PET-2) were evaluated qualitatively and semiquantitatively with calculation of SUVmax (SUV-1 and SUV-2, respectively), and the percentage variation in the SUVs and retention indexes (RI) between PET-1 and PET-2 in the breast tumour were calculated. Biological prognostic parameters, including the steroid receptor status, HER-2 expression, proliferation rate (Ki-67) and grading, were determined from primary tumour tissue. Tumour subtypes were classified following the recommendations of the 12th International Breast Conference, by immunohistochemical surrogates as luminal A, luminal B-HER2(-), luminal B-HER2(+), HER2(+) or basal. Metabolic semiquantitative parameters and molecular subtypes were correlated. RESULTS: Of the 168 tumours, 151 were classified: 16 were luminal A, 53 were luminal B-HER2(-), 29 were luminal B-HER2(+), 18 were HER2(+) and 35 were basal. There were significant differences between SUV-1 and SUV-2 and the different subtypes, with higher SUVs in HER2(+) and basal tumours. No significant differences were found with respect to RI. CONCLUSION: Semiquantitative metabolic parameters showed statistically significant differences among the molecular subtypes of the tumours evaluated. Therefore, there seems to be a relationship between molecular and glycolytic phenotypes.

HHV8 and EBV-negative primary effusion-based lymphoma: A case report of a new provisional entity and review of literature.

Key Clinical Message: HHV8- and EBV-negative primary effusion lymphoma is an extremely rare neoplasm involving body cavities without detectable tumor mass. It usually presents in elderly patients without known immunodeficiency. Compared to primary effusion lymphoma, it has a better prognosis.Primary effusion lymphoma (PEL) is a rare non-Hodgkin lymphoma confined exclusively to body cavities without detectable tumor masses. The term PEL-like is an entity similar to PEL in clinical presentation but without relation to human herpesvirus 8 (HHV8). We report a case of HHV8- and EBV-negative primary effusion-based lymphoma.

SPECT-CT metabolic and morphological study of 2 types of cemented hip stem prostheses in primary total hip arthroplasty patients: A protocol for a randomized controlled clinical trial (SPECT-PROTMA).

BACKGROUND: Cemented hip arthroplasty requires applying a layer of polymethylmethacrylate (cement) in the space between the bone and the prosthetic stem. This can be achieved using 2 techniques: the thick-layer technique (requires a layer of at least 2 mm to surround an undersized prosthetic stem), and the thin-layer technique (requires a thin layer of cement, so that the prosthetic stem fills the femoral medullary canal). Both approaches have excellent long-term clinical and radiological outcomes, although an implant's insertion into the bone generates inevitable bone mass and bone metabolic changes around it. Combination of single photon emission computed tomography and computed tomography scan (SPECT-CT) imaging combines the single photon emission computed tomography's ability to provide detailed bone metabolism assessment with the computed tomography scan's capacity to provide a meticulous anatomical study. METHODS: This is a single center, open label, randomized clinical trial, performed in the premises of the Bellvitge University Hospital. Participants will be randomly assigned to the Thick-layer technique group (Exeter V40 Cemented Femoral Stem) or to the French paradox technique group (Müller Straight Stem). All participants will have a SPECT-CT scan study at 3, 6, 12, and 24 months after the surgery. DISCUSSION: Surgical distress itself and the implant's insertion into the bone may cause microvascular changes that alter periprosthetic bone mass and bone metabolism. To the best of our knowledge, there are no studies using SPECT-CT to compare bone metabolism evolution in the postoperative period between these 2 surgical cementation techniques. We aim to provide information in this regard that could help decision making in complicated implant cases and, maybe, pave the way for larger, and methodologically improved studies. TRIAL REGISTRATION: NCT05010733 (August 18, 2021).

Comparison of different automatic methods for the delineation of the total metabolic tumor volume in I-II stage Hodgkin Lymphoma.

Total metabolic tumor volume (TMTV) is a promising quantitative biomarker for therapy assessment and prognosis in Hodgkin Lymphoma affected patients that allows prediction of patient outcome. The aim of this study was to evaluate the TMTV reproducibility between different sources of variability in tumor delimitation such as SUV-based thresholds (2.5, 41% and 50%) and software tools (Beth Israel plugin (BI) and LIFEx). Effect of contouring procedure both including single and multiple regions of interest was also studied in patients with multiple lesions, and optimal cut-offs for each studied method were displayed to compare the effect on prognosis. Strong alikeness in TMTV was found for 2.5 under software choice. Best accuracy in contouring compared to visual assessment of the disease was found for BI multiple ROI and LIFEx single ROI drawing. Similar cut-offs were found between both software for all considered thresholds, but best resemblance and highest cut-off due to an overestimation of the TMTV was found for 2.5 SUV. Our findings suggest that optimal reproducibility in TMTV is found for SUV > 2.5 threshold under choice of contouring methodology or software tool, meaning that overestimation of the TMTV threshold using 2.5 looks to be preferable than underestimation with 41% and 50%.

Clinical and pathological features of Kaposi sarcoma herpesvirus-associated inflammatory cytokine syndrome.

: Kaposi sarcoma Herpesvirus (KSHV)-associated inflammatory cytokine syndrome (KICS) is an uncommon but aggressive human Kaposi sarcoma herpesvirus associated disorder that is mostly reported in people living with HIV. The diagnosis of KICS is based on clinical criteria, and, in contrast to other KSHV-related malignancies, characteristic pathological features have not yet been described. We report novel clinical and pathological features in an HIV-1 infected patient diagnosed with KICS.

Usefulness of CA125 and its kinetic parameters and positron emission tomography/computed tomography (PET/CT) with fluorodeoxyglucose ([18F] FDG) in the detection of recurrent ovarian cancer.

BACKGROUND AND OBJECTIVE: To assess the usefulness of cancer antigen 125 (CA125) serum levels and kinetic values, velocity (CA125vel) and doubling time (CA125dt), as well as fluorodeoxyglucose ([18F]FDG) positron emission tomography/computed tomography (PET/CT), in the detection of ovarian cancer recurrence. To assess the optimal cut-off for CA125, CA125vel and CA125dt to detect relapse with [18F]FDG-PET/CT. MATERIAL AND METHODS: A retrospective analysis was performed of 59 [18F]FDG-PET/CT (48 patients) for suspected recurrence of ovarian cancer. Receiver operating characteristic (ROC) curves were plotted and area-under-the curve (AUC) statistics were computed for CA125, CA125vel and CA125dt. The results obtained in the group with normal and high (>35U/ml) CA125 levels were compared. RESULTS: Forty-four cases of recurrence were diagnosed (7 had CA125 ≤35U/ml), whereas 15 showed no disease. All of them were correctly catalogued by PET/CT. In ROC analysis, the discriminatory power of CA125 was relatively high (AUC 0.835) and the optimal cut-off point to reflect active disease was 23.9U/ml. The ROC analyses for the CA125vel and CA125dt showed an AUC of 0.849 and 0.728, respectively, with an optimal cut-off point of 1.96U/ml/month and 0.76 months, respectively. In patients with normal CA125 and recurrence of ovarian cancer, the CA125vel was significantly higher than in patients without recurrence (p=0.029). CONCLUSION: [18F]FDG-PET/CT is more accurate than CA125 parameters in the detection of ovarian cancer recurrence. CA125 serum levels are essential; nevertheless, CA125 kinetic values must be considered to detect relapse. Particularly in patients with CA125 within normal values, in which a higher CA125vel is indicative of recurrence.

Value of [18F]FDG-PET/CT and CA125, serum levels and kinetic parameters, in early detection of ovarian cancer recurrence: Influence of histological subtypes and tumor stages.

To assess the diagnostic accuracy of CA125, its kinetic values and positron emission tomography/computed tomography with 2-deoxy-2-[F]fluoro-D-glucose ([F]FDG-PET/CT), in relation with tumor characteristics for suspected recurrence of ovarian cancer. To evaluate the performance of CA125-related parameters as a selection criteria to perform a [F]FDG-PET/CT.A retrospective analysis of 69 [F]FDG-PET/CT for suspected recurrence of ovarian cancer was performed. All patients had 2 measurements of CA125, before PET/CT, to calculate kinetic values, as CA125vel (CA125vel = [CA125a - CA125b]/time) and CA125dt (CA125dt = [log2 × time]/[logCA125a - CA125b]). Maximum standard uptake value (SUVmax) was calculated. The diagnostic accuracy was calculated for all the variables and the optimal cut-off value of each of them by the receiver-operating characteristics (ROC) analysis. All the tests were compared with tumor characteristics and clinical-radiological evolution during follow-up of at least 6 months.Fifty-five cases were diagnosed of recurrence (11 with CA125 <35 U/mL), while 14 showed no disease (11 with CA125 < 35 U/mL). All of them were correctly cataloged by PET/CT. CA125, CA125vel, and SUVmax showed higher levels in recurrent patients (mean 129.54 U/mL, 24.58 U/mL per mo, and 8.69 g/mL, respectively) than in nonrecurrent (mean 20.35 U/mL, 0.60 U/mL per mo, and 0.64 g/mL, respectively). No statistical differences in CA125dt were found. Patients with recurrence of high-grade serous carcinoma (HGSC) showed higher CA125 and CA125vel, without differences in the rest of subtypes and International Federation of Gynecology and Obstetrics stages. The ROC analyses for CA125, CA125vel, and CA125dt showed an area under the curve (AUC) of 0.873 (95% confidence interval [CI] 0.77-0.969), 0.903 (95% CI 0.813-0.994), and 0.727 (95% CI 0.542-0.913), respectively, with an optimal cut-off point of 23.95 U/mL, 4.49 U/mL per mo, and 3.36 months, respectively, while for the SUVmax the AUC was of 0.982 (95% CI 0.948-1.000), and the cut-off point of 2. Multivariate regression analysis identified CA125 and CA125vel as predictors of recurrence.[F]FDG-PET/CT is more accurate than the parameters obtained from the CA125 to detect early recurrence. CA125vel is the most suitable parameter, mainly in HGSC. Levels of CA125vel ≥ 4.49 U/mL per mo facilitate earlier detection by the execution of a [F]FDG-PET/CT. The calculation of these parameters is independent of tumor stage at diagnosis.

Role of 99mTc-HYNIC-Tyr3-octreotide scintigraphy in neuroendocrine tumors based on localization of the primary tumor.

BACKGROUND: The aim of our work was to determine the accuracy of 99mTc-HYNIC Tyr3 octreotide scintigraphy (TcOS) in detecting active disease in neuroendocrine tumors (NETs) based on embryological origin of the primary tumor (foregut, midgut or hindgut). METHODS: We analyzed retrospectively 45 studies (12 staging, 26 suspicion of recurrence, and 7 treatment response) belonging to 33 patients with histological confirmation of NETs. Whole body scan and a SPECT-CT were acquired 4 hours post-injection of 740 MBq of 99mTc-HYNIC Tyr3 octreotide. The studies were divided into 3 groups based on the embryological origin of primary tumor (foregut [group 1], midgut [group 2] and hindgut [group 3]). The accuracy of TcOS in each group was assessed, included chi-square analyses. The final diagnosis was established by histopathology or clinical/radiological follow-up greater than 6 months. RESULTS: The localization of the primary tumor per patient revealed that 58% were from the foregut, 30% from the midgut and 12% from the hindgut. In study-based analysis (45 studies), TcOS showed an overall sensitivity, specificity and accuracy of 95%, 92% and 93% respectively. The accuracy per studies for the groups 1, 2 and 3 were: 100%, 92% and 66% respectively, demonstrating a better detection of active disease in primary tumors from foregut and midgut compared to hindgut (P=0.02). CONCLUSIONS: The accuracy of TcOS in the assessment of NETs seems to be better in tumors with foregut and midgut origin, showing a possible relationship between the embryological origin of NETs and detection of active disease by TcOS.

Comparison of different predictive tools of axillary status in breast cancer with micrometastatic sentinel node.

AIM: To compare the performance of six different nomograms and one score in the prediction of non-sentinel lymph node status in a subset of women with breast cancer and micrometastatic sentinel nodes (SN). MATERIAL AND METHODS: Twenty-five patients were included in the study. Five different nomograms not specifically designed for micrometastatic SN, one recently published nomogram specially developed for this type of patients and one score were analyzed, and the corresponding receiver operating characteristic curves were obtained. The area under the curve (AUC) was calculated, as well as the false negative and false positive results and their corresponding rates (FNR and FPR) for a cutoff of ≤10% or ≤4 points. RESULTS: The Memorial Sloan Kettering Cancer Center (MSKCC) nomogram showed the best performance in this low-risk group of patients (AUC 0.900, FPR 64%, FNR 0%), followed by the French nomogram. CONCLUSIONS: The MSKCC nomogram seems to have the highest accuracy in the identification of patients with low risk of further axillary disease in the subgroup of women with micrometastatic SN.

[Usefulness of (18)F-fluorodeoxyglucose-positron emission tomography-computerized tomography in the identification of the primary tumor in patients with cancer of unknown origin]. / Utilidad de la tomografía por emisión de positrones con (18)F-fluorodesoxiglucosa-tomografía computarizada en la identificación del tumor primario en pacientes con cáncer de origen desconocido.

BACKGROUND AND OBJECTIVE: We determined the utility of the (18)F-fluorodeoxyglucose ((18)F-FDG) positron emission tomography (PET)-computerized tomography (CT) in the localization of the primary tumor in patients with tumor of unknown origin (TUO). PATIENTS AND METHOD: (18)F-FDG PET-CT scans, performed between November 2006 and November 2010, in search for the primary tumor in patients with TUO, were retrospectively evaluated. Patients underwent a standard PET-CT, 50-60minutes after intravenous injection of 296-370MBq (18)F-FDG. PET-CT studies were assessed as pathological, with/without identification of the primary tumour and no pathological. Final diagnosis was established by histological confirmation and/or clinical/radiologic follow-up longer than 6 months. RESULTS: We studied 74 patients (59 males, 15 females), with ages ranging from 41-89 years. In 38 (51%) patients the PET-CT assessed the correct origin of the primary tumour. In 8 cases, a histological confirmation in the primary lesion was obtained. In 4 patients the PET-CT showed a false positive result. CONCLUSION: PET-CT scanning identified 51% of the primary sites in our sample of patients.

Usefulness of CA125 and its kinetic parameters and positron emission tomography/computed tomography (PET/CT) with fluorodeoxyglucose ([18F] FDG) in the detection of recurrent ovarian cancer / Utilidad del CA125 y sus parámetros cinéticos y de la tomografía por emisión de positrones/tomografía computarizada (PET/TC) con fluorodesoxiglucosa ([18F]FDG) en la detección de la recidiva del cáncer de ovario

Background and objective: To assess the usefulness of cancer antigen 125 (CA125) serum levels and kinetic values, velocity (CA125vel) and doubling time (CA125dt), as well as fluorodeoxyglucose ([18F]FDG) positron emission tomography/computed tomography (PET/CT), in the detection of ovarian cancer recurrence. To assess the optimal cut-off for CA125, CA125vel and CA125dt to detect relapse with [18F]FDG-PET/CT. Material and methods: A retrospective analysis was performed of 59 [18F]FDG-PET/CT (48 patients) for suspected recurrence of ovarian cancer. Receiver operating characteristic (ROC) curves were plotted and area-under-the curve (AUC) statistics were computed for CA125, CA125vel and CA125dt. The results obtained in the group with normal and high (>35U/ml) CA125 levels were compared. Results: Forty-four cases of recurrence were diagnosed (7 had CA125 ≤35U/ml), whereas 15 showed no disease. All of them were correctly catalogued by PET/CT. In ROC analysis, the discriminatory power of CA125 was relatively high (AUC 0.835) and the optimal cut-off point to reflect active disease was 23.9U/ml. The ROC analyses for the CA125vel and CA125dt showed an AUC of 0.849 and 0.728, respectively, with an optimal cut-off point of 1.96U/ml/month and 0.76 months, respectively. In patients with normal CA125 and recurrence of ovarian cancer, the CA125vel was significantly higher than in patients without recurrence (p=0.029). Conclusion: [18F]FDG-PET/CT is more accurate than CA125 parameters in the detection of ovarian cancer recurrence. CA125 serum levels are essential; nevertheless, CA125 kinetic values must be considered to detect relapse. Particularly in patients with CA125 within normal values, in which a higher CA125vel is indicative of recurrence

Fundamento y objetivo: Valorar en la recidiva del cáncer de ovario la utilidad del CA125 y sus parámetros cinéticos, velocidad (CA125vel) y tiempo de duplicación (CA125td), y de la tomografía por emisión de positrones/tomografía computarizada (PET/TC) con fluorodesoxiglucosa ([18F]FDG). Determinar el valour óptimo del CA125, CA125vel y CA125td para detectar recidiva con [18F]FDG-PET/TC. Material y métodos: Análisis retrospectivo de 59 estudios [18F]FDG-PET/TC en 48 pacientes con sospecha de recidiva de cáncer de ovario platino-sensible. Realizamos un análisis ROC (Receiver operating characteristic) y el área bajo la curva (AUC) para el CA125, CA125vel, CA125td. Comparamos los resultados entre los grupos con CA125 dentro de la normalidad y CA125 patológico (>35U/ml). Resultados: Fueron diagnosticados de recidiva 44 casos (7 con CA125 ≤35U/ml), mientras que 15 no mostraron recurrencia. Todos ellos fueron correctamente catalogados mediante la PET/TC. La curva ROC demostró una capacidad discriminatoria del CA125 relativamente alta (AUC 0.835), con un valour óptimo de referencia de 23.9U/ml. El análisis ROC para la CA125vel y el CA125td mostró un AUC de 0.849 y 0.728, con un valour de referencia de 1.96U/ml/mes y 0.76 meses, respectivamente. En las pacientes con CA125 en límites normales la CA125vel fue significativamente mayor en las pacientes con recidiva que en aquellas sin enfermedad (p=0.029). Conclusión: La [18F]FDG-PET/TC es más exacta que los parámetros de CA125 en la detección de recurrencia de cáncer de ovario. Los niveles séricos de CA125 resultan esenciales, no obstante, los parámetros cinéticos deben ser tenidos en cuenta en la detección de la recidiva

Utilidad de la tomografía por emisión de positrones con 18F-fluorodesoxiglucosa-tomografía computarizada en la identificación del tumor primario en pacientes con cáncer de origen desconocido / Usefulness of 18F-fluorodeoxiglucose-positron emission tomography-computerized tomography in the identification of the primary tumor in patients with cancer of unknown origin

Fundamento y objetivo: Valorar la utilidad de la técnica positron emission tomography (PET, «tomografía por emisión de positrones») con 18F-fluorodesoxiglucosa (18F-FDG) combinada con tomografía computarizada (TC) en la localización del tumor primario en pacientes diagnosticados de tumor de origen desconocido (TOD). Pacientes y método: Se analizaron retrospectivamente los estudios PET-TC con 18F-FDG realizados, entre noviembre de 2006 y noviembre de 2010, a pacientes con el diagnóstico de TOD para búsqueda de tumor primario. A todos los pacientes se les realizó un estudio estándar PET-TC, 50-60 minutos después de la administración intravenosa de 296-370MBq de 18F-FDG. Se valoraron los estudios PET-TC en patológicos, con/sin identificación del tumor primario, y no patológicos. El diagnóstico final se estableció mediante confirmación histológica y/o seguimiento clínico/radiológico superior a 6 meses. Resultados: Setenta y cuatro pacientes fueron estudiados (59 varones, 15 mujeres), con un intervalo de edad de 41-89 años. En 38 (51%) pacientes la PET-TC determinó correctamente el origen del tumor primario, realizándose confirmación histológica en 8 casos sobre el mismo. En 4 pacientes la PET-TC mostró un resultado falso positivo. Conclusión: La técnica PET-TC permitió identificar el 51% de los tumores primarios en nuestra muestra de pacientes (AU)

Background and objective: We determined the utility of the18F-fluorode oxyglucose (18F-FDG) positron emission tomography (PET)-computerized tomography (CT) in the localization of the primary tumor in patients with tumor of unknown origin (TUO).Patients and method:18F-FDG PET-CT scans, performed between November 2006 and November 2010, in search for the primary tumor in patients with TUO, were retrospectively evaluated. Patients underwent a standard PET-CT, 50-60 minutes after intravenous injection of 296-370 MBq18F-FDG. PET-CT studies were assessed as pathological, with/without identification of the primary tumour and no pathological. Final diagnosis was established by histological confirmation and/or clinical/radiologic follow-up longer than 6 months. Results: We studied 74 patients (59 males, 15 females), with ages ranging from 41-89 years. In 38 (51%) patients the PET-CT assessed the correct origin of the primary tumour. In 8 cases, a histological confirmation in the primary lesion was obtained. In 4 patients the PET-CT showed a false positive result. Conclusion: PET-CT scanning identified 51% of the primary sites in our sample of patients (AU)