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Saljooghi S, Heidari Z, Saravani M, Rezaei M, Salimi S. Association of AXIN1 rs12921862 C/A and rs1805105 G/A and CTSB rs12898 G/A polymorphisms with papillary thyroid carcinoma: A case-control study. J Clin Lab Anal 2022; 37:e24804. [PMID: 36510340 PMCID: PMC9833985 DOI: 10.1002/jcla.24804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Revised: 11/26/2022] [Accepted: 11/29/2022] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Papillary thyroid cancer (PTC) is the most common type of thyroid cancer which its precise etiology remains unknown. However, environmental and genetic factors contribute to the etiology of PTC. Axis inhibition protein 1 (Axin1) is a scaffold protein that exerts its role as a tumor suppressor. In addition, Cathepsin B (Ctsb) is a cysteine protease with higher expression in several types of tumors. Therefore, the aim of this study was to investigate the possible association of AXIN1 rs12921862 C/A and rs1805105 G/A and CTSB rs12898 G/A polymorphisms with PTC susceptibility. MATERIALS & METHODS In total, 156 PTC patients and 158 sex-, age-, and BMI-matched control subjects were enrolled in the study. AXIN1 rs12921862 C/A and rs1805105 G/A and CTSB rs12898 G/A polymorphisms were genotyped using the PCR-RFLP method. RESULTS There was a relationship between AXIN1 rs12921862 C/A polymorphism and an increased risk of PTC in all genetic models except the overdominant model. The AXIN1 rs1805105 G/A polymorphism was associated with an increased PTC risk only in codominant and overdominant models. The frequency of AXIN1 Ars12921862 Ars1805105 haplotype was higher in the PTC group and also this haplotype was associated with an increased risk of PTC. Moreover, the AXIN1 rs12921862 C/A polymorphism was not associated with PTC clinical and pathological findings, but AXIN1 rs1805105 G/A polymorphism was associated with almost three folds of larger tumor size (≥1 cm). There was no association between CTSB rs12898 G/A polymorphism and PTC and its findings. CONCLUSION The AXIN1 rs12921862 C/A and rs1805105 G/A polymorphisms were associated with PTC. AXIN1 rs1805105 G/A polymorphism was associated with higher tumor size.
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Affiliation(s)
- Shaghayegh Saljooghi
- Department of Clinical Biochemistry, School of MedicineZahedan University of Medical SciencesZahedanIran
| | - Zahra Heidari
- Department of Internal MedicineZahedan University of Medical SciencesZahedanIran
| | - Mohsen Saravani
- Department of Clinical Biochemistry, School of MedicineZahedan University of Medical SciencesZahedanIran,Cellular and Molecular Research CenterResistant Tuberculosis Institute, Zahedan University of Medical SciencesZahedanIran
| | - Mahnaz Rezaei
- Department of Clinical Biochemistry, School of MedicineZahedan University of Medical SciencesZahedanIran,Cellular and Molecular Research CenterResistant Tuberculosis Institute, Zahedan University of Medical SciencesZahedanIran
| | - Saeedeh Salimi
- Department of Clinical Biochemistry, School of MedicineShahid Beheshti University of Medical SciencesTehranIran
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Zhu Y, Rao J, Wei J, Liu L, Huang S, Lan J, Xue C, Li W. Gene polymorphisms in ULK1 and PIK3CA are associated with the risk of microscopic polyangiitis in the Guangxi Zhuang Autonomous Region in China. PeerJ 2021; 9:e12377. [PMID: 34820172 PMCID: PMC8588863 DOI: 10.7717/peerj.12377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Accepted: 10/03/2021] [Indexed: 11/20/2022] Open
Abstract
Background Microscopic polyangiitis (MPA) is a systemic autoimmune disease characterized by inflammation of small- and medium-sized blood vessels. Autophagy-related protein polymorphisms are involved in autoimmune disease. The aim of this study was to evaluate the effects of single-nucleotide polymorphisms (SNPs) in the ULK1 and PIK3CA genes on the risk of MPA. Method A total of 208 patients with MPA and 211 controls in the Guangxi Zhuang Autonomous Region were recruited and analyzed. The SNPs selected were detected by polymerase chain reaction and high-throughput sequencing. The differences in allele and genotype frequency, various genetic models, and stratification analyses were evaluated, haplotype evaluation was performed after linkage disequilibrium analysis, and the interaction between gene alleles was analyzed. Results A statistically significant difference was detected in the genotypic distribution of two SNPs between the two groups: ULK1rs4964879 (p = 0.019) and PIK3CArs1607237 (p = 0.002). The results of the genetic models revealed that ULK1rs4964879 and rs9481 were statistically significantly associated with an increased risk of MPA, whereas PIK3CArs1607237 was associated with a reduced risk. The association between SNPs and MPA risk was affected by age, sex, and ethnicity. The ULK1 haplotype (G-T-A-C-G-A) and PIK3CA haplotype (T-G) were associated with a reduced risk of MPA, while the PIK3CA haplotype (C-G) was associated with an increased risk. Conclusion In this study, polymorphisms in the autophagy-related genes ULK1 and PIK3CA and their association with MPA were examined. The results showed that the polymorphisms in ULK1 (rs4964879 and rs9481) and PIK3CA (rs1607237) were significantly associated with MPA risk in the Guangxi population. However, the molecular mechanisms are still unclear; basic science research and studies with larger samples are needed to confirm our conclusions and explore the underlying mechanisms.
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Affiliation(s)
- Yan Zhu
- The Second Affiliated Hospital of Guangxi Medical University, Department of Nephrology, Nanning, Guangxi, China.,The First Affiliated Hospital, Department of Nephrology, Hengyang Medical School, University of South China, Hengyang, Hunan, China
| | - Jinlan Rao
- The Second Affiliated Hospital of Guangxi Medical University, Department of Nephrology, Nanning, Guangxi, China
| | - Jingsi Wei
- The Second Affiliated Hospital of Guangxi Medical University, Department of Nephrology, Nanning, Guangxi, China
| | - Liu Liu
- The Second Affiliated Hospital of Guangxi Medical University, Department of Nephrology, Nanning, Guangxi, China
| | - Shanshan Huang
- The Second Affiliated Hospital of Guangxi Medical University, Department of Nephrology, Nanning, Guangxi, China
| | - Jingjing Lan
- The Second Affiliated Hospital of Guangxi Medical University, Department of Nephrology, Nanning, Guangxi, China
| | - Chao Xue
- The Second Affiliated Hospital of Guangxi Medical University, Department of Nephrology, Nanning, Guangxi, China
| | - Wei Li
- The Second Affiliated Hospital of Guangxi Medical University, Department of Nephrology, Nanning, Guangxi, China
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PIK3CA Gene Mutations in Solid Malignancies: Association with Clinicopathological Parameters and Prognosis. Cancers (Basel) 2019; 12:cancers12010093. [PMID: 31905960 PMCID: PMC7017171 DOI: 10.3390/cancers12010093] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2019] [Revised: 12/18/2019] [Accepted: 12/19/2019] [Indexed: 02/07/2023] Open
Abstract
Phosphoinositide kinases (PIKs) are a group of lipid kinases that are important upstream activators of various significant signaling pathways. Hyperactivation of the PI3K/AKT/mTOR pathways—either via mutations or genomic amplification—confers key oncogenic activity, essential for the development and progression of several solid tumors. Alterations in the PIK3CA gene are associated with poor prognosis of solid malignancies. Although the literature reports contradictory prognostic values of PIK3CA in aggressive cancers, most of the available data highlight the important role of PIK3CA mutation in mediating tumorigenesis via increased signaling of the PI3K/AKT/mTOR survival pathway. Several inhibitors of PI3K/AKT/mTOR pathways are investigated as potential therapeutic options in solid malignancies. This article reviews the role of PIK3CA mutations and inhibitors of PI3K/AKT/mTOR pathways in major cancer types and examines its association with clinicopathological parameters and prognosis.
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Hanafy SM, Abo Elwafa RAH, Abdelkader AA, Alowiri NH. PIK3CA Polymorphism (rs17849079 C/T) and Expression in Breast cancer Patients. GENE REPORTS 2019. [DOI: 10.1016/j.genrep.2019.100512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Singe nucleotide polymorphisms in osteosarcoma: Pathogenic effect and prognostic significance. Exp Mol Pathol 2019; 106:63-77. [DOI: 10.1016/j.yexmp.2018.12.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2018] [Revised: 08/14/2018] [Accepted: 12/05/2018] [Indexed: 12/26/2022]
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Figlioli G, Elisei R, Romei C, Melaiu O, Cipollini M, Bambi F, Chen B, Köhler A, Cristaudo A, Hemminki K, Gemignani F, Försti A, Landi S. A Comprehensive Meta-analysis of Case-Control Association Studies to Evaluate Polymorphisms Associated with the Risk of Differentiated Thyroid Carcinoma. Cancer Epidemiol Biomarkers Prev 2016; 25:700-13. [PMID: 26843521 DOI: 10.1158/1055-9965.epi-15-0652] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2015] [Accepted: 01/23/2016] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Linkage analyses and association studies suggested that inherited genetic variations play a role in the development of differentiated thyroid carcinoma (DTC). METHODS We combined the results from a genome-wide association study (GWAS) performed by our group and from published studies on DTC. With a first approach, we evaluated whether a SNP published as associated with the risk of DTC could replicate in our GWAS (using FDR as adjustment for multiple comparisons). With the second approach, meta-analyses were performed between literature and GWAS when both sources suggested an association, increasing the statistical power of the analysis. RESULTS rs1799814 (CYP1A1), rs1121980 (FTO), and 3 SNPs within 9q22 (rs965513, rs7048394, and rs894673) replicated the associations described in the literature. In addition, the meta-analyses between literature and GWAS revealed 10 more SNPs within 9q22, six within FTO, two within SOD1, and single variations within HUS1, WDR3, UGT2B7, ALOX12, TICAM1, ATG16L1, HDAC4, PIK3CA, SULF1, IL11RA, VEGFA, and 1p31.3, 2q35, 8p12, and 14q13. CONCLUSION This analysis confirmed several published risk loci that could be involved in DTC predisposition. IMPACT These findings provide evidence for the role of germline variants in DTC etiology and are consistent with a polygenic model of the disease. Cancer Epidemiol Biomarkers Prev; 25(4); 700-13. ©2016 AACR.
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Affiliation(s)
- Gisella Figlioli
- Molecular Genetic Epidemiology, German Cancer Research Center (DKFZ), Heidelberg, Germany. Department of Biology, University of Pisa, Pisa, Italy
| | - Rossella Elisei
- Department of Endocrinology and Metabolism, University of Pisa, Pisa, Italy
| | - Cristina Romei
- Department of Endocrinology and Metabolism, University of Pisa, Pisa, Italy
| | | | | | - Franco Bambi
- Blood Centre, Azienda Ospedaliero Universitaria A. Meyer, Firenze, Italy
| | - Bowang Chen
- Molecular Genetic Epidemiology, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Aleksandra Köhler
- Molecular Genetic Epidemiology, German Cancer Research Center (DKFZ), Heidelberg, Germany. II Medizinische Klinik, Gastrologie, Onkologie und Palliativmedizin, St.Agnes-Hospital Bocholt, Bocholt, Germany
| | - Alfonso Cristaudo
- Department of Endocrinology and Metabolism, University of Pisa, Pisa, Italy
| | - Kari Hemminki
- Molecular Genetic Epidemiology, German Cancer Research Center (DKFZ), Heidelberg, Germany. Center for Primary Health Care Research, Clinical Research Center, Lund University, Malmö, Sweden
| | | | - Asta Försti
- Molecular Genetic Epidemiology, German Cancer Research Center (DKFZ), Heidelberg, Germany. Center for Primary Health Care Research, Clinical Research Center, Lund University, Malmö, Sweden.
| | - Stefano Landi
- Department of Biology, University of Pisa, Pisa, Italy.
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Genetic alterations of the PIK3CA oncogene in human oral squamous cell carcinoma in an Indian population. Oral Surg Oral Med Oral Pathol Oral Radiol 2015; 120:628-35. [DOI: 10.1016/j.oooo.2015.08.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2015] [Revised: 07/25/2015] [Accepted: 08/04/2015] [Indexed: 12/23/2022]
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Wan X, Li X, Yang J, Lv W, Wang Q, Chen Y, Li Y. Genetic association between PIK3CA gene and oral squamous cell carcinoma: a case control study conducted in Chongqing, China. INTERNATIONAL JOURNAL OF CLINICAL AND EXPERIMENTAL PATHOLOGY 2015; 8:13360-13366. [PMID: 26722541 PMCID: PMC4680486] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 08/18/2015] [Accepted: 09/23/2015] [Indexed: 06/05/2023]
Abstract
PIK3CA has been shown to be involved in many malignant tumors. This study was designed to determine the expression level of PIK3CA in oral squamous cell carcinoma (OSCC) and the association of gene polymorphisms of PIK3CA with OSCC in Chinese population. The expression of PIK3CA was detected by real-time PCR in tumor and pericarcinomatous tissues of 10 OSCC patients. Nine single-nucleotide polymorphisms (SNPs) of PIK3CA (rs1607237, rs17849079, rs2677764, rs2699887, rs4855094, rs4975596, rs6443624, rs7651265 and rs7736074) in blood of 113 OSCC patients and 184 normal controls were genotyped using matrix-assisted laser desorption/ionization time of flight mass spectrometry (MALDI-TOF MS) assay. The gene expression of PIK3CA was significantly higher in tumor tissues of OSCC patients than that in pericarcinomatous tissues (P = 0.012). An increased frequency of the C allele of PIK3CA rs1607237 was observed in OSCC patients as compared with controls; However, the significance was lost after Bonferroni correction (P = 0.048, pc = 0.576). In further stratification analysis, although the frequencies of PIK3CA rs4975596 A allele in male patients and rs1607237 C allele in female patients were increased (P = 0.032, P = 0.020, respectively), the significance was also missing when Bonferroni correction was performed (P c = 0.384, (P c = 0.24, respectively). The prevalence of other SNPs of PIK3CA did not differ between OSCC patients and controls. The expression of PIK3CA was increased in OSCC tumors; however, none of the nine tested SNPs of PIK3CA was associated with susceptibility to OSCC in the studied population.
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Affiliation(s)
- Xiaoxiao Wan
- Departments of Oral and Maxillofacial Surgery, Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Stomatological Hospital of Chongqing Medical UniversityChongqing 401147, China
| | - Xian Li
- Departments of Oral and Maxillofacial Surgery, Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Stomatological Hospital of Chongqing Medical UniversityChongqing 401147, China
| | - Junyan Yang
- Departments of Laboratory Medicine, Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Stomatological Hospital of Chongqing Medical UniversityChongqing 401147, China
| | - Wei Lv
- Departments of Laboratory Medicine, Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Stomatological Hospital of Chongqing Medical UniversityChongqing 401147, China
| | - Qiming Wang
- Departments of Laboratory Medicine, Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Stomatological Hospital of Chongqing Medical UniversityChongqing 401147, China
| | - Ying Chen
- Departments of Laboratory Medicine, Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Stomatological Hospital of Chongqing Medical UniversityChongqing 401147, China
| | - Yong Li
- Departments of Oral and Maxillofacial Surgery, Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Stomatological Hospital of Chongqing Medical UniversityChongqing 401147, China
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He ML, Wu Y, Zhao JM, Wang Z, Chen YB. PIK3CA and AKT gene polymorphisms in susceptibility to osteosarcoma in a Chinese population. Asian Pac J Cancer Prev 2014; 14:5117-22. [PMID: 24175786 DOI: 10.7314/apjcp.2013.14.9.5117] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
PURPOSE To explore the association between PIK3CA and AKT single nucleotide polymorphisms(SNP) and osteosarcoma susceptibility. METHODS TaqMan polymerase chain reaction(PCR) was used to detect the genotypes of SNPs (rs7646409, rs6973569 and rs9866361) in peripheral blood samples from 59 patients with osteosarcoma and from 63 healthy controls. Unconditional logistic regression was used to analyze the correlation between SNPs and osteosarcoma risk. RESULTS No statistically significant difference was found between osteosarcoma patients and healthy controls in the genotype of AKT rs6973569 (P = 0.7). However, after stratified analysis, the genotype AA of AKT rs6973569 carried a higher risk of osteosarcoma metastasis (OR:2.94, 95%CL:1.00-8.59); the difference of rs7646409 genotype distributions between the case and control groups was statistically significant (P = 0.032). Taking genotype TT as a reference, the risk of osteosarcoma increased three fold in patients with genotype CC (OR:3.47, 95%CL:1.26-9.56). A statistically significant difference was found between the alleles C and T (P=0.005). Further analysis showed that the risk factor was more pronounced in male patients with Enneking's stage IIB and osteoblastic osteosarcoma. PIK3CA rs9866361 did not fit Hardy-Weinberg equilibrium (P < 0.05). CONCLUSIONS Genotype CC in locus PIK3CA rs7646409 may increase the risk of osteosarcoma in the Chinese population.
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Affiliation(s)
- Mao-Lin He
- Division of Spinal Surgery, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, China E-mail :
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A single nucleotide polymorphism in PIK3CA gene is inversely associated with P53 protein expression in breast cancer. Med Oncol 2014; 31:30. [PMID: 24908061 DOI: 10.1007/s12032-014-0030-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2014] [Accepted: 05/09/2014] [Indexed: 12/31/2022]
Abstract
Single nucleotide polymorphism (SNP) rs17849071 was recently reported to be inversely associated with PIK3CA amplification in follicular thyroid cancer, but the main function of this SNP remains unclear. In this study, by using PCR and sequencing method, we explored whether this SNP was associated with P53 expression status and other clinicopathological characteristics in 62 Chinese breast cancer (BCa) patients. In our results, P53 protein accumulation was significantly associated with HER2 overexpression (P = 0.013) and Ki-67 expression (P = 0.007), which were in accord with previous studies. Besides, there was a significantly inverse relationship between P53 protein expression and rs17849071 GT+GG genotype in Chinese BCa patients (P = 0.044). The SNP was not related to other important BCa markers such as estrogen receptor, progestin receptor, and HER2. Among different BCa intrinsic subtypes, no significant differences were found on P53 expression status (P = 0.356) or rs17849071 polymorphism (T>G) (P = 0.813). In conclusion, SNP rs17849071 GT+GG genotype was inversely associated with P53 protein accumulation in BCa samples. Studies with larger sample size focusing on exploring the relationship of rs17849071 polymorphisms, P53 accumulation, P53 mutations, and PIK3CA amplification might be needed.
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Gu Y, Yu Y, Ai L, Shi J, Liu X, Sun H, Liu Y. Association of the ATM gene polymorphisms with papillary thyroid cancer. Endocrine 2014; 45:454-61. [PMID: 23925578 DOI: 10.1007/s12020-013-0020-1] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/24/2013] [Accepted: 07/18/2013] [Indexed: 01/02/2023]
Abstract
Papillary thyroid cancer (PTC) is the most common type of thyroid cancer, yet few genetic markers of PTC risk useful for screening exist. Our study aimed to evaluate the association between single nucleotide polymorphisms (SNPs) of the ataxia telangiectasia mutated (ATM) gene and PTC risk. 358 patients with PTC and 360 healthy controls were included in the case-control study. Four ATM SNPs (rs664677, rs373759, rs4988099, and rs189037) were genotyped by matrix-assisted laser desorption/ionization time of flight mass spectrometry (MALDI-TOF-MS). The analysis of genetic data was performed using the SNPStats program. The allele frequencies and genotype distributions of the four ATM SNPs were not different between PTC patients and controls. We did not observe any tendency of increasing the frequency of the risk allele from controls, patients without metastasis to patients with metastasis (P(trend) > 0.05). Interestingly, the AG genotype of rs373759 was associated with PTC risk under an overdominant model of inheritance (adjusted OR = 1.38; 95 % CI, 1.03-1.87; P = 0.03). No haplotype was observed to be significantly associated with PTC risk. Our results suggest that heterozygosity for the ATM rs373759 polymorphism may be a potential risk factor for PTC.
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Affiliation(s)
- Yulu Gu
- Department of Epidemiology and Biostatistics, School of Public Health, Jilin University, Changchun, 130021, China
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Crowley EH, Arena S, Lamba S, Di Nicolantonio F, Bardelli A. Targeted knock-in of the polymorphism rs61764370 does not affect KRAS expression but reduces let-7 levels. Hum Mutat 2013; 35:208-14. [PMID: 24282149 DOI: 10.1002/humu.22487] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2013] [Accepted: 11/21/2013] [Indexed: 01/02/2023]
Abstract
Understanding the role of single-nucleotide polymorphisms (SNPs) in the pathological process represents a unique experimental challenge especially when the variants occur outside of coding regions. The noncoding SNP rs61764370 located in the 3'-untranslated region of Kirsten rat sarcoma viral oncogene homolog (KRAS) has been implicated as a risk factor for the development of cancer and the response to targeted therapies. This cancer-associated variant is thought to affect the binding of the microRNA let-7, which allegedly modulates KRAS expression. Using site-specific homologous recombination, we inserted the rs61764370:T>G KRAS gene variant in the colorectal cancer cell line SW48 (SW48 +SNP) and assessed the cellular and biochemical phenotype. We observed a significant increase in cellular proliferation, as well as a reduction in the levels of the microRNA let-7a, let-7b, and let-7c. Transcriptional and biochemical analysis showed no concomitant change in the KRAS protein expression or modulation of the downstream mitogen activated kinase or PI3K/AKT signaling. These results suggest that the cancer-associated rs61764370 variant exerts a biological effect not through transcriptional modulation of KRAS but rather by tuning the expression of the microRNA let-7.
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