Expression of Programmed Death Ligand 1 in Breast Cancer in Mexican Women.

Background: Breast cancer is one of the most common malignant forms of neoplasia worldwide; programmed death protein 1 (PD-1), an inhibitory receptor of T lymphocytes, and its ligand programmed death ligand 1 (PD-L1), play an important role in the ability of tumor cells to evade the host's immune system. Methods: We conducted a descriptive, observational study using retrospective data and an open evaluation using immunohistochemistry to determine the general prevalence of PD-L1 expression in 63 women with breast cancer who underwent a modified radical mastectomy, or quadrantectomy, with axillary lymph node removal. Results: The prevalence of PD-L1 expression was 32% in patients with breast cancer treated with radical mastectomy. PD-L1 expression was higher in patients with large tumor size (19% for pT1, 37% for pT2, 50% for pT3, and 100% for pT4), metastasis in regional lymph nodes (25% for N0, 38% for N1, 75% for pN2, and 38% for pN3), and higher histological grade carcinoma (0% for grade 1, 23% for grade 2, and 50% for grade 3). Conclusions: These findings suggest that PD-L1 expression is heterogeneous in breast cancer tumors and that its expression varies highly in tumor regions over time. The evaluation of PD-L1 expression is significant, because of the therapeutical implications that could improve the outcomes and prognosis of these patients.

El diagnóstico histológico e inmunohistoquímico de la neoplasia sólida pseudopapilar de páncreas y su diagnóstico diferencial / The histological and immunohistochemical diagnosis of solid pseudopapillary neoplasm of the pancreas and its differential diagnosis

La neoplasia pseudopapilar sólida del páncreas es un tumor poco frecuente de histogénesis incierta, descrita por separado por Gruber y Frantz, y representa aproximadamente entre el 1% y el 3% de las neoplasias pancreáticas. Se caracteriza por presentar un patrón de crecimiento sólido y quístico con formación de pseudopapilas. Principalmente se presenta en mujeres jóvenes, aunque hay casos informados en niños, en pacientes mayores y en hombres. Este tumor es de bajo grado en potencial maligno, ya que la mayoría de los casos se curan mediante resección quirúrgica completa. El conocimiento de las características morfológicas de esta neoplasia es esencial para el diagnóstico correcto. Revisamos en este artículo las características patológicas e inmunohistoquímicas de esta neoplasia y el diagnóstico diferencial con otros tumores pancreáticos

Solid pseudopapillary neoplasm of the pancreas is a rare tumor of uncertain histogenesis, described separately by Gruber and Frantz, that accounts for between approximately 1% and 3% of pancreatic neoplasms. It is characterized by a cystic and solid pattern of growth patterns with formation of pseudopapillae. It occurs primarily in young women, although cases in children and older patients and men have been reported. The tumor is of low-grade malignant potential, as the majority of the cases are cured by simple but complete surgical resection. Knowledge of the unique morphologic characteristics of this neoplasm is essential for the correct diagnosis. We review herein the pathologic and immunohistochemical features of this neoplasm and its differential diagnosis with other pancreatic tumors

[The histological and immunohistochemical diagnosis of solid pseudopapillary neoplasm of the pancreas and its differential diagnosis]. / El diagnóstico histológico e inmunohistoquímico de la neoplasia sólida pseudopapilar de páncreas y su diagnóstico diferencial.

Solid pseudopapillary neoplasm of the pancreas is a rare tumor of uncertain histogenesis, described separately by Gruber and Frantz, that accounts for between approximately 1% and 3% of pancreatic neoplasms. It is characterized by a cystic and solid pattern of growth patterns with formation of pseudopapillae. It occurs primarily in young women, although cases in children and older patients and men have been reported. The tumor is of low-grade malignant potential, as the majority of the cases are cured by simple but complete surgical resection. Knowledge of the unique morphologic characteristics of this neoplasm is essential for the correct diagnosis. We review herein the pathologic and immunohistochemical features of this neoplasm and its differential diagnosis with other pancreatic tumors.

Caso Clínico: Tumor Phyllodes / Case Report: Tumor Phyllodes

INTRODUCCIÓN: El tumor phyllodes representa menos del 1 % de los tumores mamarios, con una incidencia de 2.1 por millón a nivel mundial, la edad de presentación es entre los 35 a 55 años. Las mujeres latinas tienen mayor riesgo de tumor phyllodes que otros grupos étnicos. En Ecuador las ciudades con mayor incidencia son Quito, Guayaquil y Loja según el Registro Nacional de Tumores; en Cuenca se presenta un caso por año. CASO CLÍNICO: Paciente femenino de 46 años, con antecedente de resección de fibroadenoma en mama derecha 2 años antes, quien hace seis meses atrás, presenta tumor multilobulado de crecimiento rápido, móvil, definido, que ocupa el 80 % de la mama derecha, ecografía BIRADS II; mamografía BIRADS 0. Biopsia con aguja fina presenta resultado histopatológico de tumor phyllodes limítrofe. EVOLUCIÓN: Con el reporte de patología de tumor phyllodes maligno de alto grado con límites negativos, se realizó mastectomía; posteriormente paciente no necesito tratamiento adyuvante, al momento con buen pronóstico. CONCLUSIÓN: El tumor phyllodes maligno es poco frecuente, pero debe considerarse como diagnóstico diferencial en pacientes mayores de 35 años, su tratamiento estandarizado es quirúrgico, sin haberse demostrado que un tratamiento adyuvante pueda disminuir la recurrencia loco regional o a distancia.

BACKGROUND: The phyllodes tumor represents less than 1 % of mammary tumors, with an incidence of 2.1 per million worldwide, the age of presentation is between 35 to 55 years. Latina women are at higher risk of phyllodes tumor than other ethnic groups. In Ecuador, the cities with the highest incidence are Quito, Guayaquil and Loja according to the National Registry of Tumors. In Cuenca, one case is presented per year. CASE REPORT: Female patient of 46-year-old woman with a history of resection of fibroadenoma in the right breast 2 years; who 6 months ago, presented a rapidly growing, mobile, defined multi-lobed tumor that occupies 80 % of the right breast, BIRADS II ultrasound; mammography BIRADS 0. Fine needle biopsy presents histopathological result of phyllodes borderline tumor. EVOLUTION: Mastectomy was performed with high-grade malignant phyllodes tumor pathology report with negative limits, the patient does not need adjuvant treatment, and it remains good prognosis. CONCLUSION: Malignant phyllodes tumor is rare, but it should be considered as a differential diagnosis in patients older than 35 years, it is standardized treatment surgical, without having demonstrated that an adjuvant treatment can reduce loco or regional recurrence.

Caso Clínico: Carcinoma Papilar Sólido de Mama / Case Report: Breast Papillary Solid Carcinoma

INTRODUCCIÓN: El carcinoma papilar sólido de mama es un subtipo poco frecuente de carcinomas mamarios representando el 1 ­ 2 % y principalmente en mujeres postmenopáusicas. Su diagnóstico desde el punto de vista clínico, imagenológico y patológico es difícil. El tratamiento no está estandarizado por el bajo porcentaje de casos reportados, actualmente es aceptada la cirugía conservadora, la radioterapia, existiendo controversia en la hormonoterapia y el vaciamiento axilar, pues las metástasis ganglionares ascienden únicamente al 2 %. Su pronóstico es bueno y la complicación más común es la recidiva local. CASO CLÍNICO: Paciente femenina de 80 años, acudió a consulta por presentar una masa a nivel de mama izquierda al realizarse una autoexploración, donde identificó un nódulo de 2 cm aproximadamente. EVOLUCIÓN: Se realizó una mamografía, ecografía mamaria y la citología mamaria que dio como resultado un tumor, inicialmente se consideró como Phyllodes. Tras el diagnóstico se realizó una lumpectomía, y la patología de la pieza quirúrgica fue de un carcinoma papilar sólido, luego recibió radioterapia y vigilancia médica. CONCLUSIÓN: La autoexploración fue un pilar fundamental en el diagnóstico de este caso y alertó a la paciente a buscar valoración médica. Al tratarse de un caso poco frecuente el diagnóstico definitivo fue la patología.

BACKGROUND: Solid papillary carcinoma of the breast is a rare subtype of mammary carcinomas corresponding to 1 ­ 2 % and mainly in postmenopausal women. It is diagnosis from the clinical, imaging and pathological point of view is difficult. The treatment is not standardized due to the low percentage of cases reported, conservative surgery, radiotherapy is currently accepted, and controversy exists in hormone therapy and axillary emptying, as lymph node metastases amount to only 2 %. It is prognosis is good and the most common complication is local recurrence. CASE REPORT: An 80-year-old female patient attended the consultation by presented a mass at the level of the left breast when performing the self-examination, where identified a 2 cm nodule. EVOLUTION: Mammography, mammary ultrasound and mammary cytology outcome in a tumor, was initially considered as Phyllodes. After the diagnosis a lumpectomy was performed, and the pathology of the surgical piece was of a solid papillary carcinoma, then received radiotherapy and surveillance. CONCLUSIONS: Self-examination was a fundamental pillar in the diagnosis of this case and alerts the patient to seek medical assessment. Being a rare case, the definitive diagnosis was pathology.