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1.
Am J Clin Pathol ; 151(6): 561-573, 2019 05 03.
Article in English | MEDLINE | ID: mdl-30776071

ABSTRACT

OBJECTIVES: Limited literature is available on the tumor microenvironment (TM) of upper tract urothelial carcinoma (UTUC). This study comprehensively reviews programmed death 1 receptor (PD-1)-positive and CD8+ tumor-infiltrating lymphocytes (TILs) and programmed death ligand 1 (PD-L1) expression on tumor epithelium (TE). METHODS: Seventy-two nephroureterectomy specimens were analyzed for PD-L1, PD-1, and CD8. One percent or more tumor and lymphohistiocyte PD-L1 expression was considered positive. TIL density by H&E was scored semiquantitatively from 0 to 3, and CD8+ and PD-1+ TILs were quantified in hotspots. RESULTS: Of the cases, 37.5% demonstrated PD-L1+ on TE. PD-L1+ TE showed an association with pathologic stage (P = .01), squamous differentiation (SqD) (P < .001), TILs by H&E (P = .02), PD-1+ peritumoral TILs (P = .01), and PD-L1+ peritumoral lymphohistiocytes (P = .002). Finally, there was a significant difference in PD-1+ peritumoral TILs in cases with SqD vs no SqD (P = .03). CONCLUSIONS: Aggressive UTUC is associated with a distinct TM. Furthermore, TM of UTUC-SqD was distinctly different from those with no SqD, warranting study in a larger cohort.


Subject(s)
B7-H1 Antigen/analysis , Carcinoma/pathology , Urologic Neoplasms/pathology , Adult , Aged , Aged, 80 and over , Carcinoma/chemistry , Cell Differentiation , Female , Humans , Lymphocytes, Tumor-Infiltrating/pathology , Male , Middle Aged , Tumor Microenvironment , Urologic Neoplasms/chemistry , Urothelium/pathology
3.
Gac. méd. Méx ; Gac. méd. Méx;135(1): 31-51, ene.-feb. 1999. ilus, tab, graf
Article in Spanish | LILACS | ID: lil-256584

ABSTRACT

Se sabe que en los tumores sólidos ocurren frecuentemente cambios en el contenido de ADN, que reflejan cambios genéticos a nivel cromosómico, los que juegan un papel importante en el desarrollo y progresión de los mismos. El estudio citogenético de los tumores sólidos ha mostrado un cariotipo complejo, que ha dificultado la identificación de los cambios cromosómicos específicos. Sin embargo la genética molecular ha identificado a algunos genes asociados con la carcinogenesis y sus alteraciones en los tumores. La citometría de flujo se ha utilizado ampliamente en el análisis del contenido y distribución del ADN en tumores, tanto experimentalmente como en clínica, y relacionarlo en el pronóstico y su progresión. Su aplicación en oncología ha sido muy vasta, principalmente en ginecología, urología y gastroenterología, y se ha concentrado en la identificación de tumores en su estadio inicial y en su pronóstico. En este simposio se presentan la metodología empleada y los resultados obtenidos en el cáncer mamario, prostático y vesical principalmente


Subject(s)
Humans , Male , Female , Flow Cytometry/methods , DNA, Neoplasm/analysis , DNA, Neoplasm/genetics , Genetic Markers , Neoplasms/diagnosis , Biopsy, Needle , Genital Neoplasms, Female/chemistry , Genital Neoplasms, Female/diagnosis , Genital Neoplasms, Female/pathology , Neoplasms/chemistry , Neoplasms/pathology , Prognosis , Urologic Neoplasms/chemistry , Urologic Neoplasms/diagnosis , Urologic Neoplasms/pathology
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