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Delmonico L, Costa MASM, Fournier MV, Romano SDO, Nascimento CMD, Barbosa AS, Moreira ADS, Scherrer LR, Ornellas MHF, Alves G. Mutation profiling in the PIK3CA, TP53, and CDKN2A genes in circulating free DNA and impalpable breast lesions. Ann Diagn Pathol 2019; 39:30-35. [PMID: 30634138 DOI: 10.1016/j.anndiagpath.2018.12.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Revised: 12/21/2018] [Accepted: 12/30/2018] [Indexed: 01/05/2023]
Abstract
Breast impalpable lesions have become a clinical dilemma because they are small, presenting a heterogeneous cellular phenotype. The aim of this study was to evaluate the mutational profile of the PIK3CA, TP53, and CDKN2A genes, comparing the mammary tissue with the respective circulating free DNA (cfDNA). The PIK3CA, TP53, and CDKN2A genes were sequenced (PCR-Sanger) in 58 women with impalpable lesions (49 malignant and 9 benign) with the respective cfDNA. The chi-square or Fisher's exact test was used to evaluate statistical significance between the clinical variables and mutational profile. A total of 51 out of 58 samples generated successful mutation profiles in both breast lesion and cfDNA. Of the 37 mutations detected, 10 (27%) and 16 (43%) mutations were detected in benign and malignant breast lesions, respectively, while 2 (5%) and 9 (24%) were found in cfDNA of women with benign and malignant lesions, respectively. The lymph node involvement with mutations in the PIK3CA in malignant lesions (P = 0.001), and the relationship between mutations in PIK3CA, comparing ductal tumors with benign lesions (P = 0.05), were statistically significant. This study detected different mutations in PIK3CA, TP53, and CDKN2A genes, which represent, in part, the heterogeneity of impalpable lesions. The results confirm that more studies should be conducted on the functional role of cfDNA in the impalpable lesions.
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Affiliation(s)
- Lucas Delmonico
- Circulating Biomarkers Laboratory, Faculty of Medical Sciences, Rio de Janeiro State University, Rio de Janeiro 20550-170, Brazil; Graduate Program in Medical Sciences, Rio de Janeiro State University, Rio de Janeiro 20550-170, Brazil.
| | | | | | | | | | | | - Aline Dos Santos Moreira
- Laboratory of Functional Genomics and Bioinformatics, PTDIS/FIOCRUZ, Rio de Janeiro 21040-900, Brazil
| | | | - Maria Helena Faria Ornellas
- Circulating Biomarkers Laboratory, Faculty of Medical Sciences, Rio de Janeiro State University, Rio de Janeiro 20550-170, Brazil; Graduate Program in Medical Sciences, Rio de Janeiro State University, Rio de Janeiro 20550-170, Brazil
| | - Gilda Alves
- Circulating Biomarkers Laboratory, Faculty of Medical Sciences, Rio de Janeiro State University, Rio de Janeiro 20550-170, Brazil; Graduate Program in Medical Sciences, Rio de Janeiro State University, Rio de Janeiro 20550-170, Brazil.
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