Molecular profiling of early-stage colorectal cancer (CRC) using targeted next generation sequencing (NGS) to predict signatures of recurrence.

Authors

null

Michael C. Burns

Northwestern University, Chicago, IL

Michael C. Burns , Kristen Carroll , Ryan Jones , Masha Kocherginsky , Kirsten Bell Burdett , Guang-Yu Yang , Al Bowen Benson III, Deva Mahalingam

Organizations

Northwestern University, Chicago, IL, Northwestern University, Feinberg School of Medicine, Chicago, IL, Northwestern University Feinberg School of Medicine, Chicago, IL, Northwestern Medicine, Chicago, IL

Research Funding

U.S. National Institutes of Health
U.S. National Institutes of Health

Background: While the 5-year recurrence rate in early stage CRC is low (12%) and there is currently limited role of adjuvant chemotherapy in such cases, a unique subset of patients (pts) will have late recurrences. To identify molecular signatures predictive of late recurrence after pts undergo intended curative resection, we employed a 22 targeted gene NGS panel in pts with early CRC. Association between mutation status and recurrence free survival (RFS) was analyzed. Methods: Pts with stage I-II CRC had their tumor prospectively sequenced between 09/2015-12/2018 by an ion torrent targeted 22 gene hotspot NGS panel, including KRAS, EGFR, BRAF, PIK3CA, AKT1, ERBB2/4, PTEN, NRAS, STK11, MAP2K1, ALK, DDR2, CTNNB1, MET, TP53, SMAD4, FBX7, NOTCH1, and FGFR1/2/3. Associations were analyzed with unadjusted p-values (p) and Benjamini & Hochberg adjusted (BHp) shown. Results: Clinical and pathologic data from 180 pts were analyzed: median age 66 (range 24-86), male (47%), stage I (41%), stage II (69%), left (54%) vs right (36%) sided primary tumors, and microsatellite stable (85%). 35 (19%) pts had adjuvant therapy (n = 21 rectal, n = 14 colon). Pathological mutations were found in 160 (89%) of pts, including TP53 (56%), KRAS (44%), PIK3CA (22%), BRAF (12%), SMAD4 (8%), MET (6%) and NRAS (3%). There was only 1 case of ERBB2 mutation. 33 pts (18%) had evidence of recurrence. 36 month RFS was 82%. Common sites of recurrence included liver (13 pts, 39%), lung (10 pts, 30%), and bone (2 pts, 6%). Alterations in MET cDNA and protein were associated with recurrence-free survival (RFS) (HR = 4.1; p =0.0026, BHp= 0.057). Interestingly, while TP53 mutations are typically associated with worse prognosis in metastatic colorectal cancers, it was not associated with RFS (HR = 0.8; p = 0.55, BHp= 0.98). There was also no association between the number of gene alterations and RFS (p = 0.45). Conclusions: These data highlight that targeted NGS tumor profiling of early stage CRC, including sequencing MET among other genes, may be utilized alongside known prognostic pathological factors to predict pts with a higher risk of recurrence and may facilitate tailored adjuvant chemotherapy to mitigate this risk.

Disclaimer

This material on this page is ©2024 American Society of Clinical Oncology, all rights reserved. Licensing available upon request. For more information, please contact licensing@asco.org

Abstract Details

Meeting

2020 Gastrointestinal Cancers Symposium

Session Type

Poster Session

Session Title

Poster Session C: Anal and Colorectal Cancer

Track

Colorectal Cancer,Anal Cancer

Sub Track

Tumor Biology, Biomarkers, and Pathology

Citation

J Clin Oncol 38, 2020 (suppl 4; abstr 242)

Abstract #

242

Poster Bd #

L20

Abstract Disclosures

Similar Abstracts

Abstract

2023 ASCO Gastrointestinal Cancers Symposium

Circulating tumor DNA–based genomic landscape of KRAS wild-type pancreatic adenocarcinoma.

First Author: Brendon Fusco

First Author: Kristen Carroll

First Author: Ke He