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1.
J Gastrointest Cancer ; 52(1): 374-380, 2021 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-33225411

RESUMO

PURPOSE: Over the last decades, cytotoxic chemotherapy has been the cornerstone of metastatic pancreatic adenocarcinoma treatment. In late-stage disease, a range of treatment regimens still offers minor benefits. Molecular profiling studies have shown that pancreatic adenocarcinoma (PDAC) is a mutation-driven tumor type, with KRAS mutations found in approximately 90% of cases, which could partially explain the resistance to chemotherapy. Preclinical data on selective targeting of a downstream point of the RAF-MEK-ERK pathway with a MEK inhibitor along with the concurrent use of an autophagy inhibitor such as hydroxychloroquine appears to be one alternative approach to overcome resistance and inhibit cell proliferation. METHODS: We herein aim to investigate the rationale of autophagy inhibitors use and describe the outcomes of patients who received this experimental treatment. RESULTS: Two patients have received this experimental regimen from January 2020 to the present date, achieving disease stabilization that is clinically meaningful, considering the chemoresistance scenario of the included patients. CONCLUSIONS: Our real-life data regarding KRAS-mutated PDAC patients who received treatment with the MEK inhibitor trametinib combined with hydroxychloroquine after experiencing disease progression are consistent with the preclinical data, pointing to the clinical benefits of this regimen.


Assuntos
Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , Carcinoma Ductal Pancreático/tratamento farmacológico , Hidroxicloroquina/farmacologia , Hidroxicloroquina/uso terapêutico , Neoplasias Pancreáticas/tratamento farmacológico , Piridonas/uso terapêutico , Pirimidinonas/uso terapêutico , Idoso de 80 Anos ou mais , Protocolos de Quimioterapia Combinada Antineoplásica/farmacologia , Autofagia/efeitos dos fármacos , Autofagia/genética , Antígeno CA-19-9/sangue , Carcinoma Ductal Pancreático/diagnóstico , Carcinoma Ductal Pancreático/genética , Carcinoma Ductal Pancreático/secundário , Progressão da Doença , Relação Dose-Resposta a Droga , Resistencia a Medicamentos Antineoplásicos/efeitos dos fármacos , Resistencia a Medicamentos Antineoplásicos/genética , Feminino , Humanos , Sistema de Sinalização das MAP Quinases/efeitos dos fármacos , Sistema de Sinalização das MAP Quinases/genética , Masculino , Pessoa de Meia-Idade , Mutação , Estadiamento de Neoplasias , Pâncreas/diagnóstico por imagem , Pâncreas/patologia , Neoplasias Pancreáticas/diagnóstico , Neoplasias Pancreáticas/genética , Neoplasias Pancreáticas/patologia , Tomografia por Emissão de Pósitrons combinada à Tomografia Computadorizada , Proteínas Proto-Oncogênicas p21(ras)/genética , Proteínas Proto-Oncogênicas p21(ras)/metabolismo , Piridonas/farmacologia , Pirimidinonas/farmacologia , Resultado do Tratamento
2.
Lung Cancer ; 90(2): 161-6, 2015 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-26358312

RESUMO

OBJECTIVE: Sixteen percent of US population is Hispanic, mostly Mexican. Recently, two independent American reports demonstrated a higher overall survival (OS) in Hispanic populations compared with non-Hispanic-white populations (NHW) with non-small-cell lung cancer (NSCLC), even when most Hispanic patients are diagnosed at advanced disease stages and have lower income status. We analyzed the clinical, pathological, and molecular characteristics as well as outcomes in a cohort of NSCLC Hispanic patients from the National Cancer Institute of Mexico that could explain this "Hispanic Paradox". MATERIAL AND METHODS: A cohort of 1260 consecutive NSCLC patients treated at the National Cancer Institute of Mexico from 2007 to 2014 was analyzed. Their clinical-pathological characteristics, the presence of EGFR and KRAS mutations and the prognosis were evaluated. RESULTS: Patients presented with disease stages II, IIIa, IIIb and IV at rates of 0.6, 4.8, 18.4 and 76.3%, respectively. NSCLC was associated with smoking in only 56.5% of the patients (76.7% of male vs. 33.0% of female patients). Wood smoke exposure (WSE) was associated with 37.2% of the cases (27.3% in men vs. 48.8% in women). The frequency of EGFR mutations was 27.0% (18.5% in males vs. 36.9% in females, p<0.001) and the frequency for KRAS mutations was 10.5% (10.3% men vs. 10.1% in women p=0.939). The median OS for all patients was 23.0 [95% CI 19.4-26.2], whereas for patients at stage IV, it was 18.5 months [95% CI 15.2-21.8]. The independent factors associated with the OS were the ECOG, disease stage, EGFR and KRAS mutation status. CONCLUSION: The high frequency of EGFR mutations and low frequency of KRAS mutations in Hispanic populations and different prevalence in lung cancer-related-developing risk factors compared with Caucasian populations, such as the lower frequency of smoking exposure and higher WSE, particularly in women, might explain the prognosis differences between foreign-born-Hispanics, US-born-Hispanics and NHWs.


Assuntos
Carcinoma Pulmonar de Células não Pequenas/genética , Carcinoma Pulmonar de Células não Pequenas/patologia , Neoplasias Pulmonares/genética , Neoplasias Pulmonares/patologia , Mutação/genética , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Carcinoma de Células Grandes/genética , Carcinoma de Células Grandes/patologia , Carcinoma de Células Escamosas/genética , Carcinoma de Células Escamosas/patologia , Receptores ErbB/genética , Feminino , Hispânico ou Latino , Humanos , Masculino , México , Pessoa de Meia-Idade , Prognóstico , Fumaça/efeitos adversos , Fumar/efeitos adversos , Adulto Jovem , Proteínas ras/genética
3.
Rev. méd. Chile ; 143(3): 310-319, mar. 2015. ilus, graf, tab
Artigo em Espanhol | LILACS | ID: lil-745628

RESUMO

Background: In Chile, colorectal cancer (CRC) is often diagnosed in late stages. Thus, surgical treatment must be complemented with chemotherapy. KRAS mutations and microsatellite instability have been detected in these tumors. However, the response to treatment in patients without KRAS mutations varies and requires a better understanding. Aim: To determine the frequency and distribution of somatic point mutations in KRAS, BRAF and PIK3CA genes and microsatellite instability status (MSI) in patients with colon cancer (CC). Material and Methods: A prospective observational study of patients undergoing surgery for colon cancer. Tumor-derived DNA was analyzed by polymerase chain reaction (PCR) for the most frequent mutations of KRAS, BRAF and PIK3CA. PCR was also used to analyze MSI. Results: Fifty-eight patients with sporadic CC were analyzed, 16 showed KRAS mutations (G12R, G12D, G12V, G13D) and out of the 42 patients that did not show any mutation, 10 had mutations in BRAF (V600E) and PIK3CA (E542K, E545D, E545K, Q546E, H1047R). BRAF mutations alone or in combination with PIK3CA mutations were observed in 27% of high MSI tumors and in 2% of tumors without instability (p < 0.049). A higher percentage of high MSI tumors were located in the right colon (p < 0.001), and showed BRAF mutation (p < 0.020). Conclusions: The highest percentage of high MSI and BRAF mutations was observed in the right colon. Therefore, this study suggests the presence of different molecular features between right and left colon tumors that should be considered when defining the therapeutic management.


Assuntos
Animais , Camundongos , Interferon Tipo I/imunologia , Interferon gama/imunologia , /imunologia , /imunologia , Interleucinas/imunologia , Macrófagos/imunologia , Mycobacterium tuberculosis/imunologia , Tuberculose/imunologia , Interferon Tipo I/genética , Interferon gama/genética , /genética , /genética , Interleucina-1beta/imunologia , Interleucinas/genética , Ativação de Macrófagos/imunologia , Macrófagos/microbiologia , Macrófagos/patologia , Camundongos Knockout , Tuberculose/genética , Tuberculose/patologia , Fator de Necrose Tumoral alfa/genética , Fator de Necrose Tumoral alfa/imunologia
4.
Rev. méd. Chile ; 142(11): 1407-1414, nov. 2014. ilus, tab
Artigo em Espanhol | LILACS | ID: lil-734876

RESUMO

Background: The molecular testing of KRAS mutation status in metastatic colorectal cancer patients is mandatory to identify patients eligible for anti-epidermal growth factor receptor monoclonal antibody therapy. Aim: To report the frequency of KRAS gene mutations in Chilean patients with colorectal cancer (CRC). Material and Methods: A cohort of 262 Chilean patients with CRC aged 26 to 90 years (53% males), was studied. KRAS mutation status was analyzed by real-time polymerase chain reaction and correlated with clinicopathological data. Results: Ninety-eight patients (37%) were positive for KRAS mutations. G12D was the most common mutation with a frequency of 36.7%, followed by G12V (25.5%), G13D (17.3%), G12A (7.1%), G12C (6.1%), G12S (5.1%) and G12R (2%). The frequency of the mutation in left, right colon and rectal tumors was 37.8, 32.6 and 44.9%, respectively. Among tumors with mutations, 86.7% were well or moderately differentiated tumors and the rest were poorly differentiated. No significant associations between KRAS gene mutations and other clinicopathological features of the tumor were observed. Conclusions: The frequencies of KRAS mutations reported in this study are similar to frequencies reported for European and North-American populations, lower than in a Spanish study and higher than in a Peruvian study.


Assuntos
Adulto , Idoso , Idoso de 80 Anos ou mais , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Neoplasias Colorretais/genética , Mutação , Proteínas Proto-Oncogênicas/genética , Proteínas ras/genética , Fatores Etários , Chile/etnologia , Neoplasias Colorretais/etnologia , Neoplasias Colorretais/patologia , Análise Mutacional de DNA , DNA de Neoplasias/genética , Fator de Crescimento Epidérmico/genética , Invasividade Neoplásica/genética , Estudos Prospectivos , Reação em Cadeia da Polimerase em Tempo Real , Fatores Sexuais
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