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1. The Transcriptomic Portrait of Locally Advanced Breast Cancer and Its Prognostic Value in a Multi-Country Cohort of Latin American Patients

Author

Andrea Sabina Llera, Eliana Saul Furquim Werneck Abdelhay, Nora Artagaveytia, Adrián Daneri-Navarro, Bettina Müller, Carlos Velazquez, Elsa B. Alcoba, Isabel Alonso, Daniela B. Alves da Quinta, Renata Binato, Alicia Inés Bravo, Natalia Camejo, Dirce Maria Carraro, Mónica Castro, Juan M. Castro-Cervantes, Sandra Cataldi, Alfonso Cayota, Mauricio Cerda, Alicia Colombo, Susanne Crocamo, Alicia Del Toro-Arreola, Raúl Delgadillo-Cisterna, Lucía Delgado, Marisa Dreyer-Breitenbach, Laura Fejerman, Elmer A. Fernández, Jorge Fernández, Wanda Fernández, Ramón A. Franco-Topete, Carolina Gabay, Fancy Gaete, Adriana Garibay-Escobar, Jorge Gómez, Gonzalo Greif, Thomas G. Gross, Marisol Guerrero, Marianne K. Henderson, Miguel E. Lopez-Muñoz, Alejandra Lopez-Vazquez, Silvina Maldonado, Andrés J. Morán-Mendoza, Maria Aparecida Nagai, Antonio Oceguera-Villanueva, Miguel A. Ortiz-Martínez, Jael Quintero, Antonio Quintero-Ramos, Rui M. Reis, Javier Retamales, Ernesto Rivera-Claisse, Darío Rocha, Robinson Rodríguez, Cristina Rosales, Efrain Salas-González, Verónica Sanchotena, Laura Segovia, Juan Martín Sendoya, Aida A. Silva-García, Alejandra Trinchero, Olivia Valenzuela, Vidya Vedham, Livia Zagame, United States-Latin American Cancer Research Network (US-LACRN), Osvaldo L. Podhajcer, Juan Abarca, Pamela Acevedo, Graciela Acosta, Gissel Acosta, Gabriela Acosta Haab, Ana Lilian Acosta Silva, Marta Aghazarian, Carola Aguayo, Bernardo Aizen, Gustavo Alarcon Lopez, Liz Almeida, Ana Alvarez, Viviane Andrade, Wenceslao Angeles-Bueno, Roberto Arai, Priscila Elvira Arambula Barreras, Ma. Isabel Aramburo Rubio, Gonzalo Ardao, Lilia A. Arellano-Jimenez, Claudia Arias, Ricardo Armisen, Mauricio Aspee, Rodrigo Assar, Itzel Reneé Astiazarán Rascón, Sebastian Astorga, Maxwell Aviles Rodriguez, Antônio Bailão Junior, Adolfo E. Barragan-Curiel, Adelfo Barragan-Ruiz, Fernanda Bermudez, Julia Bernachin, Wilfrido Bernal Herrera, Mara Bonet, Sarah Brnich, Claudio Bustamante, Miguel Angel Bustamante, Julio Bustos-Gomez, Felipe de J Bustos-Rodriguez, Janett Caballero Jasso, Angie Calfuman, Antonio Hugo José Froes Marques, Mónica Campos, Soledad Cano, Juan C. Canton-Romero, Ricardo Cappetta, Paulina Carmona, Fernando Carrizo, André Lopes Carvalho, Erika Carvallo, Julio Carzoglio, Monica Casalnuovo, Benedicta Caserta, Alvaro Castillo, César Castillo, Roger Chammas, Mario Alberto Chavez Zamudio, Loreto Chia, Elisa Chiarello, Daniela Chirico, Esther Cisneros-Quirarter, Minor Raul Cordero Bautista, Valeria Cornejo, Baldemar Corral Villegas, Andrés Cortés, Sandra Cortés, Laura Cortes-Sanabria, German Salvador Cortez Zamorano, Alejandro Corvalan, Adolfo Cruz, Alba d'Aurora, Sandra De la Fuente, Soledad De la Peña, Roberto de Leon Caballero, Mirian de Souza, César Del Castillo, Azucena Del-Toro-Valero, Mirtha Di Pretoro, Andrea Digonzelli, Jose El Ters, Paula Escobar, Marcela Estolaza, Adriane Feijo Evangelista, Marcelo Fanelli, Paulo Farias, Graciela Fernandez, José R. Filassi, Natalia Filgueiras, Diego Flaks, Edgar G. Flores-Ayala, Maria R. Flores-Marquez, David Franco Hughes, Karina Franco-Topete, Jimena Freire, Cristobal Fresno, Romina Gabrielli, Mario Gallegos, Jorge Gamboa, Daiana Ganiewich, Carlos Garbovesky, Ruben Alejandro Garcia Munguia, Ricardo Garcia-Gaeta, Alma C. Garcia-Martinez, Liliana Gimenez, Hector Gómez Silveira, Mariana M. Gomez-Del Toro, Marcela Gonzalez, Alicia Gonzalez, Germán González, Cesar Osbaldo Gonzalez Mondaca, Leivy P. Gonzalez-Ramirez, Beatriz Gonzalez-Ulloa, Susana Gorostidy, Mariela Grass, Alfonso G. Guevara Torres, Lorena Gutierrez, Susan A. Gutierrez-Rubio, Adrián Hannois, Andrew Hart, Steffen Härtel, Marcos Henriquez, Rafael Hernandez Guevara, Miriam E. Hernandez-Franco, Manuel I. Herrera-Miramontes, Graciela Horton, Gladys Ibañez, Martín Ipiña, Beatriz Jalfin, Lilian Jara, Raul Jara, Maria Luisa Jaramillo, David Javalera-Castro, Maria Eugenia Jimenez, Hugo Ju, Nazareth Juárez Rusjan, Karen Juneman, Ligia Maria Kerr, Alejandra Krupelis, Flor Esmeralda Larios-Jimenez, Jose Domingo Latorre, Guillermo Laviña, Fernando Lavista, Irma Leticia León Duarte, Alberto Lescano, Verónica Lezano, Rossana Mendoza Lopez, Jose Guillermo Lopez Cervantes, Miguel Enrique Lopez Muñoz, Dora Loria, Alejandra Luque, Alejandro Maass, Maria do Socorro Maciel, Flavia Rotea Mangone, Jorge Mansilla, Katherine Marcelain, Carolina Mariani, Marcia Maria Chiquitelli Marques, Reyna J. Martinez-Arriaga, Hector R. Martinez-Ramirez, Marcela Martins, Alma G. Maya-Gonzalez, Brenda Mazzaferri, Yadira Medina-Mora, Mariana Menini, Silvia Míguez, Soledad Milans, Soledad Montes, Ana Verónica Morales Hernández, Giberto Morga-Villela, Carla Morong, Homero Muñoz, Ignacio Miguel Muse, Carina Mussetti, Eduardo Mussetti, Luis J. Najar-Acosta, Elisa Napolitano e Ferreira, Nancy E. Navarro-Ruiz, Cristina Noblía, João Soares Nunes, Daniela Núñez, Fabiola Núñez, Nilton Onari, Emma M. Oropeza-De Anda, David Ortega Tirado, Cynthia Aparecida Bueno de Toledo Osório, Carlos Eduardo Paiva, Paulina Peñaloza, Miguel Peredo-Navarro, David Pereira, Laura Perez Michel, Francisca Pino, Tania Pino, Natalia Pinto, Jessica Pizarro, Carlos Pressa, Enrique Ramirez, Gladys E. Ramirez-Rosales, Claudia Ramis, Maritza Ramos-Ramirez, Adela Rascon Alcantar, Silvana Ravaglio, Francois Richard, Omar Rios Méndez, Ramón Enrique Robles Zepeda, Iara Santana Rocha, Natalia Rodriguez, Vilma Rodriguez, Maria Teresa Rodriguez, Diego Rodriguez-Gonzalez, Rosemeire A Roela, Ana M Romero-Gomez, Ana M Rosales-Sandoval, Omar V Rubio-Plascencia, Florencia Russo, Gaciela Sabini, Isabel Saffie, Helena Salina Dias, Brenda Guadalupe Samaniego Soto, Julio San Martino, Benito Sanchez-Llamas, Daniel Sat-Muñoz, Mariana Savignano, Cristovam Scapulatempo Neto, Max Mano Senna, Carolina Silva, Jaime Silvera, Isabele Small, Fernando Soares, Iberê Soares, Silvana Soares dos Santos, Evandro Sobrosa de Mello, José Antonio Sola, Irene Sorín, Alejandra Sosa, Anabella Sosa, Claudio Sosa, Sandra Soto, Cristiano de Pádua Souza, Lucía Spangenberg, Gustavo Steffanof, Florencia Straminsky, Mónica Tapia, Raziel O. Tapia-Llanos, Geronimo M. Tavares-Macias, Guillermo Temperley, Veronica Terzieff, Vicente Teti, Javier Tognarelli, Verónica Toledo, Paulina Toro, Roberto Torres, Mariana Torres-Palomares, Rogelio Troyo-San Roman, Hernan Urbano, Nicolas Vacca, Daniel Vaimberg, María Lourdes Valencia Peña, Maria Lujan Vaselevich, Jaime Vazquez-Nares, Ezequiel Velez-Gomez, Laura N. Venegas-Godinez, Patricia Vercelli, Ricardo Verdugo, René Aloisio da Costa Vieira, Marta Vilensky, María José Villarubias, Manuel Isaac Villegas Gómez, Stella Viña, Silvia Vornetti, Anapaula Hidemi Uema Watanabe, Carlos Zamorano, Luis Zapata, and Zdenka Zlatar

Subjects
breast cancer, Latin America, PAM50 subtypes, risk of recurrence, biological pathways, Neoplasms. Tumors. Oncology. Including cancer and carcinogens, RC254-282
Abstract

PurposesMost molecular-based published studies on breast cancer do not adequately represent the unique and diverse genetic admixture of the Latin American population. Searching for similarities and differences in molecular pathways associated with these tumors and evaluating its impact on prognosis may help to select better therapeutic approaches.Patients and MethodsWe collected clinical, pathological, and transcriptomic data of a multi-country Latin American cohort of 1,071 stage II-III breast cancer patients of the Molecular Profile of Breast Cancer Study (MPBCS) cohort. The 5-year prognostic ability of intrinsic (transcriptomic-based) PAM50 and immunohistochemical classifications, both at the cancer-specific (OSC) and disease-free survival (DFS) stages, was compared. Pathway analyses (GSEA, GSVA and MetaCore) were performed to explore differences among intrinsic subtypes.ResultsPAM50 classification of the MPBCS cohort defined 42·6% of tumors as LumA, 21·3% as LumB, 13·3% as HER2E and 16·6% as Basal. Both OSC and DFS for LumA tumors were significantly better than for other subtypes, while Basal tumors had the worst prognosis. While the prognostic power of traditional subtypes calculated with hormone receptors (HR), HER2 and Ki67 determinations showed an acceptable performance, PAM50-derived risk of recurrence best discriminated low, intermediate and high-risk groups. Transcriptomic pathway analysis showed high proliferation (i.e. cell cycle control and DNA damage repair) associated with LumB, HER2E and Basal tumors, and a strong dependency on the estrogen pathway for LumA. Terms related to both innate and adaptive immune responses were seen predominantly upregulated in Basal tumors, and, to a lesser extent, in HER2E, with respect to LumA and B tumors.ConclusionsThis is the first study that assesses molecular features at the transcriptomic level in a multicountry Latin American breast cancer patient cohort. Hormone-related and proliferation pathways that predominate in PAM50 and other breast cancer molecular classifications are also the main tumor-driving mechanisms in this cohort and have prognostic power. The immune-related features seen in the most aggressive subtypes may pave the way for therapeutic approaches not yet disseminated in Latin America.Clinical Trial RegistrationClinicalTrials.gov (Identifier: NCT02326857).

Published
2022
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2. Socioeconomic, Clinical, and Molecular Features of Breast Cancer Influence Overall Survival of Latin American Women

Author

Liz Maria de Almeida, Sandra Cortés, Marta Vilensky, Olivia Valenzuela, Laura Cortes-Sanabria, Mirian de Souza, Rafael Alonso Barbeito, Eliana Abdelhay, Nora Artagaveytia, Adrian Daneri-Navarro, Andrea S. Llera, Bettina Müller, Osvaldo L. Podhajcer, Carlos Velazquez, Elsa Alcoba, Isabel Alonso, Alicia I. Bravo, Natalia Camejo, Dirce Maria Carraro, Mónica Castro, Sandra Cataldi, Alfonso Cayota, Mauricio Cerda, Alicia Colombo, Susanne Crocamo, Alicia Del Toro-Arreola, Raul Delgadillo-Cristerna, Lucia Delgado, Marisa Dreyer Breitenbach, Elmer Fernández, Jorge Fernández, Wanda Fernández, Ramon A. Franco-Topete, Fancy Gaete, Jorge Gómez, Leivy P. Gonzalez-Ramirez, Marisol Guerrero, Susan A. Gutierrez-Rubio, Beatriz Jalfin, Alejandra Lopez-Vazquez, Dora Loria, Silvia Míguez, Andres de J. Moran-Mendoza, Gilberto Morgan-Villela, Carina Mussetti, Maria Aparecida Nagai, Antonio Oceguera-Villanueva, Rui M. Reis, Javier Retamales, Robinson Rodriguez, Cristina Rosales, Efrain Salas-Gonzalez, Laura Segovia, Juan M. Sendoya, Aida A. Silva-Garcia, Stella Viña, Livia Zagame, Beth Jones, Moysés Szklo, United States-Latin American Cancer Research Network (US-LACRN), Juan Abarca, Pamela Acevedo, Graciela Acosta, Ana Acosta, Gabriela Acosta Haab, Keyla Teresa Acosta-Torres, Marta Aghazarian, Carola Aguayo, Gustavo Alarcon-Lopez, Viviane Andrade, Wenceslao Angeles Bueno, Roberto Arai, Priscila Elvira Arambula-Barreras, Maria Isabel Arámburo-Rubio, Estrellita Araus, Gonzalo Ardao, Lilia A. Arellano-Jimenez, Felipe Argandoña, Claudia Arias, Ricardo Armisen, Mauricio Aspee, Rodrigo Assar, Itzel Reneé Astiazarán-Rascón, Sebastian Astorga, Maxwell Avilés-Rodrıguez, Antônio Bailão Junior, Adolfo E. Barragan-Curiel, Adelfo Barragan-Ruiz, Julia Bernachin, Wilfrido Bernal-Herrera, Renata Binato, Sarah Brnich, Claudio Bustamante, Miguel Angel Bustamante, Julio Bustos Gomez, Felipe de J. Bustos Rodriguez, Janett Caballero-Jasso, Angie Calfuman, Antonio Hugo, José Froes Marques Campos, Mónica Campos, Soledad Cano, Juan C. Canton-Romero, Paulina Carmona, Fernando Carrizo, Andre Lopes Carvalho, Erika Carvallo, Julio Carzoglio, Monica Casalnuovo, Benedicta Caserta, Alvaro Castillo, César Castillo, Juan M. Castro-Cervantes, Yascara Cerda, Roger Chammas, Mario Alberto Chavez-Zamudio, Loreto Chia, Daniela Chirico, Esther Cisneros-Quirarter, Minor Raul Cordero-Bautista, Valeria Cornejo, Baldemar Corral-Villegas, Andrés Cortés, German Salvador Cortez-Zamorano, Alejandro Corvalan, Adolfo Cruz, Alba d’Aurora, Sandra De la Fuente, Soledad De la Peña, Roberto de Leon-Caballero, César Del Castillo, Azucena Del-Toro-Valero, Mirtha Di Pretoro, Andrea Digonzelli, Jose El Ters, Paula Escobar, Marcela Estolaza, Adriane Feijo Evangelista, Marcelo Fanelli, Paulo Farias, Diego Flaks, Edgar G. Flores-Ayala, Maria R. Flores-Marquez, David Franco-Hughes, Karina Franco-Topete, Cristobal Fresno, Carolina Gabay, Mario Gallegos, Jorge Gamboa, Daiana Ganiewich, Carlos Garbovesky, Ricardo Garcia-Gaeta, Alma C. Garcia-Martinez, Rubén Alejandro Garcıa-Munguıa, Adriana Garibay-Escobar, Liliana Gimenez, Mariana M. Gomez-Del Toro, Germán González, César Osbaldo González Mondaca, Beatriz Gonzalez-Ulloa, Susana Gorostidy, Gonzalo Greif, Alfonso G. Guevara-Torres, Lorena Gutierrez, Adrián Hannois, Andrew Hart, Steffen Härtel, Marcos Henriquez, Miriam E Hernandez-Franco, Rafael Hernandez-Guevara, Manuel I Herrera-Miramontes, Graciela Horton, Gladys Ibañez, Martın Ipiña, Lilian Jara, Raul Jara, Maria Luisa Jaramillo, Beatriz Jardim, Maria Eugenia Jimenez, Victor M. Jimenez-Moreno, Hugo Ju, Nazareth Juárez Rusjan, Karen Juneman, Ligia Maria Kerr, Alejandra Krupelis, Guillermo Laviña, Fernando Lavista, Irma Leticia León-Duarte, Alberto Lescano, Verónica Lezano, Rossana Mendoza Lopez, Jose Guillermo López-Cervantes, Miguel Enrique Lopez-Muñoz, Francisca Lucena, Alejandra Luque, Alejandro Maass, Maria do Socorro Maciel, Silvina Maldonado, Flavia Rotea Mangone, Jorge Mansilla, Katherine Marcelain, Carolina Mariani, Marcia Maria Chiquitelli Marques, Reyna J Martinez-Arriaga, Hector R Martinez-Ramirez, Marcela Martins, Alma G Maya-Gonzalez, Mariana Menini, Soledad Milans, Soledad Montes, Ana Verónica Morales Hernández, Carla Morong, Eduardo Mussetti, Luis J Najar-Acosta, Elisa Napolitano e Ferreira, Nancy E Navarro Ruiz, Cristina Noblıa, João Soares Nunes, Fabiola Núñez, Nilton Onari, Emma M Oropeza-De Anda, David Ortega-Tirado, Miguel Angel Ortiz-Martinez, Cynthia Aparecida Bueno de Toledo Osório, Carlos Eduardo Paiva, Paulina Peñaloza, Miguel Peredo Navarro, David Pereira, Laura Perez-Michel, Francisca Pino, Tania Pino, Natalia Pinto, Jessica Pizarro, Jael Quintero, Antonio Quintero-Ramos, Enrique Ramirez, Gladys E Ramirez-Rosales, Claudia Ramis, Maritza Ramos Ramirez, Adela Rascon-Alcantar, Francois Richard, Omar Rios-Méndez, Ernesto Rivera-Claisse, Ramón E. Robles-Zepeda, Iara Santana Rocha, Natalia Rodriguez, Vilma Rodriguez, Maria Teresa Rodriguez, Diego Rodriguez-Gonzalez, Rosemeire A Roela, Ana M. Romero-Gomez, Ana M. Rosales-Sandoval, Lidia A. Rubio-Chavez, Omar V. Rubio-Plascencia, Florencia Russo, Gaciela Sabini, Isabel Saffie, Brenda Samaniego, Benito Sanchez-Llamas, Verónica Sanchotena, Daniel Sat-Muñoz, Mariana Savignano, Cristovam Scapulatempo Neto, Max Mano Senna, Carolina Silva, Jaime Silvera, Isabele Small, Fernando Soares, Iberê Soares, Silvana Soares dos Santos, Evandro Sobrosa de Mello, José Antonio Sola, Irene Sorın, Alejandra Sosa, Claudio Sosa, Cristiano de Pádua Souza, Lucıa Spangenberg, Gustavo Steffanof, Florencia Straminsky, Mónica Tapia, Raziel O. Tapia-Llanos, Geronimo M. Tavares-Macias, Veronica Terzieff, Vicente Teti, Javier Tognarelli, Verónica Toledo, Paulina Toro, Roberto Torres, Mariana Torres-Palomares, Alejandra Trinchero, Rogelio Troyo-San Roman, Hernan Urbano, Nicolas Vacca, Marıa Lourdes Valencia-Peña, Jaime Vazquez Nares, Ezequiel Velez-Gomez, Laura N. Venegas-Godinez, Ricardo Verdugo, René Aloisio da Costa Vieira, Manuel Isaac Villegas-Gómez, Silvia Vornetti, Anapaula H. U. Watanabe, Carlos Zamorano, Luis Zapata, and Zdenka Zlatar

Subjects
global excellence, oncology, Latin America, breast cancer, molecular subtypes, risk factors, Neoplasms. Tumors. Oncology. Including cancer and carcinogens, RC254-282
Abstract

Molecular profile of breast cancer in Latin-American women was studied in five countries: Argentina, Brazil, Chile, Mexico, and Uruguay. Data about socioeconomic characteristics, risk factors, prognostic factors, and molecular subtypes were described, and the 60-month overall cumulative survival probabilities (OS) were estimated. From 2011 to 2013, 1,300 eligible Latin-American women 18 years or older, with a diagnosis of breast cancer in clinical stage II or III, and performance status ≦̸1 were invited to participate in a prospective cohort study. Face-to-face interviews were conducted, and clinical and outcome data, including death, were extracted from medical records. Unadjusted associations were evaluated by Chi-squared and Fisher’s exact tests and the OS by Kaplan–Meier method. Log-rank test was used to determine differences between cumulative probability curves. Multivariable adjustment was carried out by entering potential confounders in the Cox regression model. The OS at 60 months was 83.9%. Multivariable-adjusted death hazard differences were found for women living in Argentina (2.27), Chile (1.95), and Uruguay (2.42) compared with Mexican women, for older (≥60 years) (1.84) compared with younger (≤40 years) women, for basal-like subtype (5.8), luminal B (2.43), and HER2-enriched (2.52) compared with luminal A subtype, and for tumor clinical stages IIB (1.91), IIIA (3.54), and IIIB (3.94) compared with stage IIA women. OS was associated with country of residence, PAM50 intrinsic subtype, age, and tumor stage at diagnosis. While the latter is known to be influenced by access to care, including cancer screening, timely diagnosis and treatment, including access to more effective treatment protocols, it may also influence epigenetic changes that, potentially, impact molecular subtypes. Data derived from heretofore understudied populations with unique geographic ancestry and sociocultural experiences are critical to furthering our understanding of this complexity.

Published
2022
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3. Breast cancer incidence and the air pollution level in the communes of Chile: an ecological study

Author

Isabel Saffie Vega, Pedro Ferrer Rosende, Jorge Sapunar Zenteno, and Badir Chahuán Manzur

Subjects
Cancer Research, medicine.medical_specialty, Population, Air pollution, medicine.disease_cause, air environmental pollutants, 03 medical and health sciences, 0302 clinical medicine, Breast cancer, breast cancer, Environmental health, Epidemiology, medicine, Human Development Index, education, 0303 health sciences, education.field_of_study, business.industry, Incidence (epidemiology), Research, 030311 toxicology, Ecological study, Regression analysis, medicine.disease, Oncology, 030220 oncology & carcinogenesis, epidemiology, business
Abstract

There is evidence linking air pollutants associated with vehicular traffic such as polycyclic aromatic hydrocarbons with breast carcinogenesis. Epidemiological studies have shown conflicting results regarding air pollution and breast cancer risk, which could be explained by the multitude of other risk factors that could affect the association. In Chile, air pollution has reached alarming levels, either due to motorised vehicle traffic or the combustion of wood for heating; therefore, our objective was to evaluate the association between the incidence of breast cancer and the concentration of the main air pollutants monitored in the country. We carried out a cross-sectional ecological study that evaluated the association between the average incidence of breast cancer in years (2016 to 2018) and the average annual concentration of six atmospheric pollutants in the 5 years prior to the estimation of the rate in communes of Chile, using the population of beneficiaries of Instituto Oncologico Fundacion Arturo Lopez Perez. The annual incidence of breast cancer was 72.21 cases per 100,000 women and it varied significantly in the communes studied compared to the human development index (HDI) and to the proportion of women in the age group at highest risk. Assessing the relationship between the incidence of breast cancer and the average concentration of atmospheric pollutants, we only found a direct correlation between the level of nitrogen dioxide and the rate (R = 0.82; p = 0.044), whose significance tends to be lost when age and the communal HDI are included in a regression model.

Published
2021

4. Predictors of pathologic complete response to neoadjuvant treatment in HER2-overexpressing breast cancer: a retrospective analysis using real-world data.

Author

V., Isabel Saffie, Z., Jorge Sapunar, F., Felipe Buscaglia, C., Felipe Reyes, Ch., Rodrigo Lagos, and M., Badir Chahuán

Subjects
*NEOADJUVANT chemotherapy, *EPIDERMAL growth factor receptors, *BREAST cancer, *CANCER chemotherapy, *COMBINATION drug therapy, *RECTAL cancer
Abstract

The human epidermal growth factor receptor 2 (ERBB2, HER2 or HER2/neu) is a transmembrane tyrosine kinase receptor that is overexpressed in approximately 20% of breast cancers. The use of the anti-HER2 monoclonal antibodies Pertuzumab and Trastuzumab in association with chemotherapy has achieved a higher percentage of pathologic complete response (pCR) than conventional chemotherapy. The purpose of our study was to identify factors that could affect the therapeutic response of patients with breast cancer and HER2 overexpression treated with cytotoxic chemotherapy plus double HER2 blockade in neoadjuvant setting at Fundación Arturo López Pérez (FALP). A case–control study was designed to evaluate the effect of clinical and histopathological variables on the response to neoadjuvant therapy. Ninety-four women with non-metastatic breast cancer and HER2 overexpression received neoadjuvant combination chemotherapy with Trastuzumab and Pertuzumab at FALP during the period 2017–2020. Seventy percent of patients achieved pCR, and in the group of hormone receptor negative patients, 89% of patients achieved pCR. Different variables were analysed trying to look for clinicopathological predictors of complete response. This study provides us with real-world data on the efficacy of using this treatment combination in our population of HER2-overexpressing breast cancer patients. [ABSTRACT FROM AUTHOR]

Published
2022
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5. Breast cancer incidence and the air pollution level in the communes of Chile: an ecological study.

Author

Zenteno, Jorge Sapunar, Rosende, Pedro Ferrer, Manzur, Badir Chahuán, and Vega, Isabel Saffie

Subjects
*AIR pollution, *BREAST cancer, *AIR pollutants, *DISEASE risk factors, *WOOD combustion, *HUMAN carcinogenesis
Abstract

There is evidence linking air pollutants associated with vehicular traffic such as polycyclic aromatic hydrocarbons with breast carcinogenesis. Epidemiological studies have shown conflicting results regarding air pollution and breast cancer risk, which could be explained by the multitude of other risk factors that could affect the association. In Chile, air pollution has reached alarming levels, either due to motorised vehicle traffic or the combustion of wood for heating; therefore, our objective was to evaluate the association between the incidence of breast cancer and the concentration of the main air pollutants monitored in the country. We carried out a cross-sectional ecological study that evaluated the association between the average incidence of breast cancer in years (2016 to 2018) and the average annual concentration of six atmospheric pollutants in the 5 years prior to the estimation of the rate in communes of Chile, using the population of beneficiaries of Instituto Oncológico Fundación Arturo López Pérez. The annual incidence of breast cancer was 72.21 cases per 100,000 women and it varied significantly in the communes studied compared to the human development index (HDI) and to the proportion of women in the age group at highest risk. Assessing the relationship between the incidence of breast cancer and the average concentration of atmospheric pollutants, we only found a direct correlation between the level of nitrogen dioxide and the rate (R = 0.82; p = 0.044), whose significance tends to be lost when age and the communal HDI are included in a regression model. [ABSTRACT FROM AUTHOR]

Published
2021
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