Basal (18)F-FDG PET/CT as a predictive biomarker of tumor response for neoadjuvant therapy in breast cancer.

PURPOSE: To explore the relation between tumor kinetic assessed by (18)F-FDG PET and final neoadjuvant chemotherapy (NC) response within a molecular phenotype perspective. MATERIAL AND METHODS: Prospective study included 144 women with breast cancer. All patients underwent a dual-time point (18)F-FDG PET/CT previous to NC. The retention index (RI), between SUV-1 and SUV-2 was calculated. Molecular subtypes were re-grouped in low, intermediate and high-risk biological phenotypes. After NC, all residual primary tumor specimens were histopathologically classified in tumor regression grades (TRG) and response groups. The relation between SUV-1, SUV-2 and RI with the TRG and response groups was evaluated in all molecular subtypes and in accordance with the risk categories. RESULTS: Responder's lesions showed significant greater SUVmax compared to non-responders. The RI value did not show any significant relation with response. Attending to molecular phenotypes, statistical differences were observed with greater SUV for responders having high-risk molecular subtypes. CONCLUSION: Glycolytic tumor characteristics showed a significant correlation with NC response and dependence of risk phenotype.

[Adenoid cystic carcinoma. Presentation of three clinical cases]. / Carcinoma adenoide quístico. Presentación de tres casos clínicos.

Adenoid cystic carcinomas are malignant epithelial tumors that originate in body regions containing exocrine and eccrine glands. Their most common location is the salivary glands. These tumors have specific, highly individualized histopathological and clinical features. Three cases of adenoid cystic carcinoma in different sites, palate, sublingual gland, and nasal cavity, are reported. The literature is reviewed for information about the fundamental clinical, diagnostic, and therapeutic aspects of these tumors.

18F-FDG semi-quantitative parameters and biological prognostic factors in locally advanced breast cancer.

AIM: To analyse the correlation between (18)F-FDG uptake assessed by PET/CT in locally advanced breast tumours and histopathological and immunohistochemical prognostic factors. MATERIAL AND METHODS: Thirty-six women with breast cancer were prospectively evaluated. PET/CT was requested in the initial staging previous to adjuvant chemotherapy (multicentric study). All the patients underwent an (18)F-FDG PET/CT with a dual-time-point acquisition. Both examinations were evaluated qualitatively and semiquantitatively with calculation of SUVmax values in PET-1 (SUV-1) and in PET-2 (SUV-2) and the percentage variation of the standard uptake values (retention index) between PET-1 and PET-2. Clinical and metabolic stages were assessed according to TNM classification. The biological prognostic parameters, such as the steroid receptor status, p53 and c-erbB-2 expression, proliferation rate (Ki-67), and grading were determined from tissue of the primary tumour. Metabolic and biological parameters were correlated. RESULTS: A positive relationship was found between semiquantitative metabolic parameters and biological parameters. SUV-1 and SUV-2 values did not show significant statistical correlation (p<.05) except for the clinical tumour size. About the biological parameters, retention index showed the best results with positive and significant relation (p<.05) with estrogen and progesterone receptor status and Ki-67. Isolated SUV values did not show significant relation to these parameters. CONCLUSION: Retention index showed the best relation with biological parameters compared to isolated SUVmax values. These data suggest that SUV change over time is a prognostic marker.

Basal 18F-FDG PET/CT as a predictive biomarker of tumor response for neoadjuvant therapy in breast cancer / 18F-FDG PET/TC basal como biomarcador predictor de respuesta tumoral al tratamiento neoadyuvante en el cáncer de mama

Purpose. To explore the relation between tumor kinetic assessed by 18F-FDG PET and final neoadjuvant chemotherapy (NC) response within a molecular phenotype perspective. Material and Methods. Prospective study included 144 women with breast cancer. All patients underwent a dual-time point 18F-FDG PET/CT previous to NC. The retention index (RI), between SUV-1 and SUV-2 was calculated. Molecular subtypes were re-grouped in low, intermediate and high-risk biological phenotypes. After NC, all residual primary tumor specimens were histopathologically classified in tumor regression grades (TRG) and response groups. The relation between SUV-1, SUV-2 and RI with the TRG and response groups was evaluated in all molecular subtypes and in accordance with the risk categories. Results. Responder's lesions showed significant greater SUVmax compared to non-responders. The RI value did not show any significant relation with response. Attending to molecular phenotypes, statistical differences were observed with greater SUV for responders having high-risk molecular subtypes. Conclusion. Glycolytic tumor characteristics showed a significant correlation with NC response and dependence of risk phenotype (AU)

Objetivo. Estudiar la relación entre la cinética tumoral valorada por 18F-FDG PET y la respuesta final al tratamiento neoadyuvante (TN) bajo la perspectiva del fenotipo molecular. Material y métodos. Estudio prospectivo que incluye 144 mujeres con cáncer de mama. A todas las pacientes se les realizó una 18F-FDG PET/CT de doble fase previa al TN. El índice de retención (IR) entre el SUV-1 y el SUV-2 fue calculado. Los subtipos moleculares se agruparon en bajo, intermedio y alto riesgo. Tras el TN, los especímenes residuales tumorales se clasificaron histológicamente en grados de regresión tumoral (GRT) y grupos de respuesta. La relación entre el SUV-1, SUV-2 y el IR con los GRT y los grupos de respuesta se evaluó para todos los subtipos moleculares y las categorías de riesgo. Resultados. Las lesiones que experimentaron respuesta mostraron mayores valores de SUVmax comparadas con las no respondedoras. El IR no mostró ninguna relación significativa con la respuesta. De acuerdo con los fenotipos moleculares, se observaron diferencias significativas con mayores valores de SUV en los respondedores pertenecientes a los subtipos moleculares de alto riesgo. Conclusión. Las características glucolíticas tumorales mostraron una relación significativa con la respuesta al TN y dependencia del fenotipo de riesgo (AU)

18F-FDG semi-quantitative parameters and biological prognostic factors in locally advanced breast cancer

Objetivo. Analizar la correlación entre la captación de 18FFDG valorada por la PET-TC en cáncer de mama localmente avanzado y factores pronósticos histopatológicos e inmunohistoquímicos. Material y métodos. Se valoraron prospectivamente 36 mujeres con cáncer de mama. La PET-TC fue requerida en la estadificación previamente al tratamiento quimioterápico (estudio multicéntrico). A todas se les realizó una PET-TC con 18FFDG en 2 fases. Ambas fueron valoradas cualitativa y semicuantitativamente con cálculo del SUVmax en la PET-1 (SUV-1) y en la PET-2 (SUV-2) así como el índice de retención. Los estadios clínicos y metabólicos fueron evaluados siguiendo la clasificación TNM. Se determinaron los parámetros biológicos pronósticos del tumor primario, como el estado de los receptores esteroideos, la expresión del p53 y c-erbB-2, el índice de proliferación (Ki-67) y el grado histológico. Los parámetros biológicos e histológicos fueron correlacionados. Resultados. Se encontró una relación positiva entre los parámetros metabólicos semicuantitativos y los biológicos. Los valores de SUV-1 y SUV-2 no mostraron una correlación estadísticamente significativa excepto para el tamaño clínico tumoral. Acerca de los parámetros biológicos, el índice de retención mostró los mejores resultados con relación positiva y significativa (p<0,05) con el estado de los receptores estrogénicos y progestágenos y el Ki-67. Los valores aislados del SUV no mostraron relación significativa con esos parámetros. Conclusión. El índice de retención mostró la mayor relación con los parámetros biológicos comparados con los valores aislados de SUVmax. Estos datos sugieren que el cambio del SUV es un marcador pronóstico(AU)

Aim. To analyse the correlation between 18F-FDG uptake assessed by PET/CT in locally advanced breast tumours and histopathological and immunohistochemical prognostic factors. Material and methods. Thirty-six women with breast cancer were prospectively evaluated. PET/CT was requested in the initial staging previous to adjuvant chemotherapy (multicentric study). All the patients underwent an 18F-FDG PET/CT with a dual-time-point acquisition. Both examinations were evaluated qualitatively and semiquantitatively with calculation of SUVmax values in PET-1 (SUV-1) and in PET-2 (SUV-2) and the percentage variation of the standard uptake values (retention index) between PET-1 and PET-2. Clinical and metabolic stages were assessed according to TNM classification. The biological prognostic parameters, such as the steroid receptor status, p53 and c-erbB-2 expression, proliferation rate (Ki-67), and grading were determined from tissue of the primary tumour. Metabolic and biological parameters were correlated. Results. A positive relationship was found between semiquantitative metabolic parameters and biological parameters. SUV-1 and SUV-2 values did not show significant statistical correlation (p<.05) except for the clinical tumour size. About the biological parameters, retention index showed the best results with positive and significant relation (p<.05) with estrogen and progesterone receptor status and Ki-67. Isolated SUV values did not show significant relation to these parameters. Conclusion. Retention index showed the best relation with biological parameters compared to isolated SUVmax values. These data suggest that SUV change over time is a prognostic marker(AU)