Whole genome sequencing reveals potential targets for therapy in patients with refractory KRAS mutated metastatic colorectal cancer

BMC Medical Genomics

John D Carpten²  David W Craig²  Daniel D Von Hoff²  Galen Hostetter¹  Christopher Murray²  Angela Baker²  Lori Phillips²  Hollie Benson²  Alexis Christoforides²  Tyler Izatt²  Ahmet Kurdoglu²  Winnie S Liang²  Manpreet Chadha³  Shripad Sinari²  Nicole A Lavender²  Ramesh K Ramanathan³  Vijayalakshmi Shanmugam² 

[1] Van Andel Research Institute (VARI), Grand Rapids, MI, USA;Translational Genomics Research Institute (TGen), 445 N Fifth Street, Phoenix, AZ 85004, USA;Virginia G Piper Cancer Center, Scottsdale, AZ, USA

关键词: KRAS mutations;    Whole genome sequencing;    Metastatic colorectal cancer;   

Others  :  796969
DOI  :  10.1186/1755-8794-7-36

 received in 2013-05-20, accepted in 2014-05-29,  发布年份 2014

【 摘 要 】

Background

The outcome of patients with metastatic colorectal carcinoma (mCRC) following first line therapy is poor, with median survival of less than one year. The purpose of this study was to identify candidate therapeutically targetable somatic events in mCRC patient samples by whole genome sequencing (WGS), so as to obtain targeted treatment strategies for individual patients.

Methods

Four patients were recruited, all of whom had received > 2 prior therapy regimens. Percutaneous needle biopsies of metastases were performed with whole blood collection for the extraction of constitutional DNA. One tumor was not included in this study as the quality of tumor tissue was not sufficient for further analysis. WGS was performed using Illumina paired end chemistry on HiSeq2000 sequencing systems, which yielded coverage of greater than 30X for all samples. NGS data were processed and analyzed to detect somatic genomic alterations including point mutations, indels, copy number alterations, translocations and rearrangements.

Results

All 3 tumor samples had KRAS mutations, while 2 tumors contained mutations in the APC gene and the PIK3CA gene. Although we did not identify a TCF7L2-VTI1A translocation, we did detect a TCF7L2 mutation in one tumor. Among the other interesting mutated genes was INPPL1, an important gene involved in PI3 kinase signaling. Functional studies demonstrated that inhibition of INPPL1 reduced growth of CRC cells, suggesting that INPPL1 may promote growth in CRC.

Conclusions

Our study further supports potential molecularly defined therapeutic contexts that might provide insights into treatment strategies for refractory mCRC. New insights into the role of INPPL1 in colon tumor cell growth have also been identified. Continued development of appropriate targeted agents towards specific events may be warranted to help improve outcomes in CRC.

【 授权许可】

   
2014 Shanmugam et al.; licensee BioMed Central Ltd.

【 图 表 】

Figure 1.

Figure 2.

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