RESUMO
Background: Early cancer diagnosis might improve survival rates. As circulating tumor DNA (ctDNA) carries cancer-specific modifications, it has great potential as a noninvasive biomarker for detection of incipient tumors. Patients and methods: We collected cell-free DNA (cfDNA) samples of 1002 elderly without a prior malignancy, carried out whole-genome massive parallel sequencing and scrutinized the mapped sequences for the presence of (sub)chromosomal copy number alterations (CNAs) predictive for a malignancy. When imbalances were detected, 6-monthly clinical follow-up was carried out. Results: In 3% of participants chromosomal imbalances were detected. Follow-up analyses, including whole-body MRI screening, confirmed the presence of five hematologic malignancies: one Hodgkin lymphoma (HL), stage II; three non-HL (type chronic lymphocytic leukemia, Rai I-Binet A; type SLL, stage III; type mucosa-associated lymphoid tissue, stage I) and one myelodysplastic syndrome with excess blasts, stage II. The CNAs detected in cfDNA were tumor-specific. Furthermore, one case was identified with monoclonal B-cell lymphocytosis, a potential precursor of B-cell malignancy. In 24 additional individuals, CNAs were identified but no cancer diagnosis was made. For 9 of them, the aberrant cfDNA profile originated from peripheral blood cells. For 15 others the origin of aberrations in cfDNA remains undetermined. Conclusion(s): Genomewide profiling of cfDNA in apparently healthy individuals enables the detection of incipient hematologic malignancies as well as clonal mosaicism with unknown clinical significance. CNA screening of cellular DNA of peripheral blood in elderly has established that clonal mosaicism for these chromosomal anomalies predicts a 5- to 10-fold enhanced risk of a subsequent cancer. We demonstrate that cfDNA screening detects CNAs, which are not only derived from peripheral blood, but even more from other tissues. Since the clinical relevance of clonal mosaics in other tissues remains unknown, long-term follow-up is warranted. Taken together, this study demonstrates that genomewide cfDNA analysis has potential as an unbiased screening approach for hematological malignancies and premalignant conditions.
Assuntos
DNA Tumoral Circulante/análise , Variações do Número de Cópias de DNA , DNA de Neoplasias/análise , Detecção Precoce de Câncer/métodos , Neoplasias/diagnóstico , Neoplasias/genética , Sequenciamento Completo do Genoma/métodos , Idoso , Idoso de 80 Anos ou mais , DNA Tumoral Circulante/genética , Estudos de Coortes , DNA de Neoplasias/genética , Feminino , Sequenciamento de Nucleotídeos em Larga Escala/métodos , Humanos , Masculino , Pessoa de Meia-Idade , Neoplasias/sangue , PrognósticoAssuntos
Resistencia a Medicamentos Antineoplásicos/efeitos dos fármacos , Imidazóis/farmacologia , Mutação/genética , Proteínas de Fusão Oncogênica/genética , Piperazinas/efeitos adversos , Células Precursoras de Linfócitos B/efeitos dos fármacos , Proteínas Tirosina Quinases/genética , Proteínas Proto-Oncogênicas c-kit/genética , Piridazinas/farmacologia , Pirimidinas/efeitos adversos , Receptor Tipo 1 de Fator de Crescimento de Fibroblastos/genética , Receptor alfa de Fator de Crescimento Derivado de Plaquetas/genética , Fatores de Poliadenilação e Clivagem de mRNA/genética , Animais , Benzamidas , Células Cultivadas , Humanos , Mesilato de Imatinib , Camundongos , Células Precursoras de Linfócitos B/citologia , Células Precursoras de Linfócitos B/metabolismo , Inibidores de Proteínas Quinases/efeitos adversos , Proteínas Tirosina Quinases/antagonistas & inibidoresRESUMO
Despite excessive rainfalls, Flanders is dealing with a water deficiency. A rational use of water is a necessity. Apart from the prevention principle, the re-use of biologically treated wastewater (bio-effluent) is increasingly considered. From earlier research it is known that reverse osmosis (RO) is necessary for the elimination of salts and low molecular compounds from the bio-effluent. A thorough pretreatment is necessary to remove drastically the suspended solids, which are harmful to the reverse osmosis modules. This case study describes the experiments performed by SEGHERSbetter technology for Water N.V. on the treatment of wastewater effluent from a brewery. A comparative study between sand filtration (SF), in-line coagulation with sand filtration and ultrafiltration (UF) as a pretreatment was made. UF proved to be the best pretreatment for RO for the treatment of brewery bio-effluent. Finally, an economic evaluation of the membrane system (UF followed by RO) was made. The calculated total cost for the system is 0.26 Euros per m3 produced water. Investment costs and operation cost are also discussed.
