scholarly journals Current and emerging biomarkers in metastatic colorectal cancer

2019 ◽  
Vol 26 (1) ◽  
Author(s):  
M.K.C. Lee ◽  
J. M. Loree
Keyword(s):  
Colorectal Cancer ◽  
Metastatic Colorectal Cancer ◽  
Her2 Amplification ◽  
Liquid Biopsies ◽  
Braf Mutations ◽  
Pik3ca Mutations ◽  
Improved Outcomes ◽  
Therapeutic Choice ◽  
Novel Biomarkers ◽  
Deficient Mismatch Repair

Background The incorporation of novel biomarkers into therapy selection for patients with metastatic colorectal cancer (mcrc) has significantly improved outcomes. Optimal treatment planning now takes into account diverse characteristics of patients and their tumours to create personalized therapeutic plans.Discussion This review is split into two sections. In the first section, we review the prognostic and predictive significance of expanded RAS mutation testing, BRAF mutations, ERBB2 (her2) amplification, microsatellite instability (msi) and deficient mismatch repair (dmmr) protein, NTRK fusions, PIK3CA mutations, and met amplifications. The therapeutic implication of each of those biomarkers for personalizing therapies for each patient with mcrc is discussed. In the second section, we touch on testing methods and considerations of relevance to clinicians when they interpret companion diagnostics meant to guide therapy selection. The advantages and pitfalls of various methods are evaluated, and we also look at the potential of liquid biopsies and circulating tumour dna (ctdna) to change the landscape of therapeutic choice and biologic understanding of the disease.Summary Routine testing for extended RAS, BRAF, dmmr or high msi, and NTRK fusions is necessary to determine the best sequencing of chemotherapy and biologic agents for patients with mcrc. Although next generation sequencing and ctdna are increasingly being adopted, other techniques such as immunohistochemistry retain their relevance in detection of her2 amplification, NTRK fusions, and dmmr.

scholarly journals Molecular Targets for the Treatment of Metastatic Colorectal Cancer

Cancers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2350
Author(s):  
Romain Cohen ◽  
Thomas Pudlarz ◽  
Jean-François Delattre ◽  
Raphaël Colle ◽  
Thierry André
Keyword(s):  
Colorectal Cancer ◽  
Molecular Targets ◽  
Predictive Biomarkers ◽  
Therapeutic Strategies ◽  
Her2 Amplification ◽  
Liquid Biopsies ◽  
Braf Mutations ◽  
Genetic Characteristics ◽  
New Developments ◽  
The Past

Over the past years, colorectal cancer (CRC) was subtyped according to its molecular and genetic characteristics, allowing the development of therapeutic strategies, based on predictive biomarkers. Biomarkers such as microsatellite instability (MSI), RAS and BRAF mutations, HER2 amplification or NTRK fusions represent major tools for personalized therapeutic strategies. Moreover, the routine implementation of molecular predictive tests provides new perspectives and challenges for the therapeutic management of CRC patients, such as liquid biopsies and the reintroduction of anti-EGFR monoclonal antibodies. In this review, we summarize the current landscape of targeted therapies for metastatic CRC patients, with a focus on new developments for EGFR blockade and emerging biomarkers (MSI, HER2, NTRK).

Molecular characteristics of complete PTEN loss in metastatic colorectal cancer.

2013 ◽  
Vol 31 (4_suppl) ◽  
pp. 389-389
Author(s):  
Zhi-Qin Jiang ◽  
Laurel Deaton ◽  
Nastaran Neishaboori ◽  
Jean-Nicolas Vauthey ◽  
Michael J. Overman ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Metastatic Colorectal Cancer ◽  
Cpg Island ◽  
Pik3ca Mutation ◽  
The Cancer Genome Atlas ◽  
Akt Pathway ◽  
Molecular Characteristics ◽  
Braf Mutations ◽  
Pik3ca Mutations ◽  
Pten Loss

389 Background: Loss of expression of phosphatase and tensin homolog (PTEN) is associated with activation of the PI3K/AKT pathway, and has been identified as a potential modulator of response to targeted therapies in metastatic colorectal cancer (mCRC). The association of PTEN loss with other molecular characteristics and outcomes has not been described for mCRC. Methods: Tumor from 229 mCRC patients (pts) were included for analysis of PTEN staining by IHC from whole-mounts, across two cohorts of unresectable mCRC or resectable liver-limited disease. PTEN loss was defined as complete loss of staining with preservation of expression of stromal components. Mutation status was defined using mass-spectroscopy or next-generation sequencing platforms. CpG island methylation (CIMP) status was determined using a previously defined 6-marker panel, with methylation of ≥3 markers denoting CIMP-High. Methylation findings where confirmed in 193 pts from the Cancer Genome Atlas (TCGA) database, using previously defined classifications. Results: The overall frequency of complete PTEN loss was 12% in the primary tumor and 15% when assayed from metastatic sites (P=NS). There was no difference in clinical characteristics in patients with PTEN-loss tumors. Complete PTEN loss and PIK3CA mutations were not mutually exclusive, with PIK3CA mutation rate of 24% and 14% in PTEN loss and intact, respectively (p=0.3). There was no association of PTEN loss with KRAS mutations (p=0.3), although there were non-significant trends toward higher rates of CIMP-High, BRAF mutations, and R-sided tumors (OR 3.2, 2.7, and 1.6, respectively; p<0.2), consistent with an association with the serrated adenoma pathway and epigenetic inactivation. In the TCGA, PTEN protein loss (defined by the lowest 12% of expression) was associated with increased AKT signaling (77% increase in pAKT/AKT, p<0.01) and a similar trend with CIMP-H tumors (OR 3.1, p=0.13). Conclusions: In patient samples, PTEN loss is independent of KRAS and PIK3CA mutations, associated with robust AKT pathway activation, and may be more prominent in tumors with hypermethylation and BRAF mutations.

Survival outcome in HER2-amplified metastatic colorectal cancer (mCRC).

2018 ◽  
Vol 36 (4_suppl) ◽  
pp. 642-642
Author(s):  
Kentaro Sawada ◽  
Wataru Okamoto ◽  
Yoshiaki Nakamura ◽  
Takeharu Yamanaka ◽  
Satoshi Yuki ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Metastatic Colorectal Cancer ◽  
Primary Tumor ◽  
Survival Outcome ◽  
Braf V600e ◽  
Her2 Status ◽  
Her2 Amplification ◽  
Braf Mutations ◽  
Signal Ratio ◽  
Group B

642 Background: HER2 amplifications have been observed in approximately 3% of patients (pts) with metastatic colorectal cancer (mCRC). Early clinical trials with combined HER2-targeted therapies showed promising activities. However, it remains unclear whether HER2 amplification in mCRC is as prognostic as RAS or BRAF V600E mutant (mt). We aimed to evaluate survival outcome for mCRC pts with HER2 amplification compared to those with RAS or BRAF mt. Methods: mCRC pts who received a palliative resection of the primary tumor with metastatic diseases at presentation, or recurred after curative resection of the primary tumor between 2005 and 2015, were analyzed. HER2 immunohistochemistry (IHC) was performed using formalin-fixed and paraffin-embedded (FFPE) sections obtained from the primary tumor, and HER2 amplification was confirmed by fluorescence in situ hybridization (FISH) in case of IHC 2+ or 3+. Criteria for HER2 amplification were a HER2- to CEP17- signal ratio of 2.0 or higher. RAS / BRAF status was centrally assessed by a PCR-based method. The pts were classified into four subgroups based on RAS, BRAF and HER2 status: Group R , RAS mt; Group B, BRAF V600E mt; Group H, HER2 amplification with RAS / BRAF wild-type (wt); and Group W, RAS / BRAF wt. Results: Among 370 pts, 359 pts (97%) were successfully analyzed. A total of 15 pts (4%) had HER2 amplifications, out of which four pts had overlapped RAS mt (subclassified as Group R). RAS or BRAF mutations are mutually exclusive. The number in Group R, B, H and W was 204 (57%), 13 (4%), 11 (3%) and 131 (36%), respectively. There was no remarkable difference in baseline characteristics among groups. With a median follow-up time of 63 months (mos), the median overall survival of the 359 pts was 27 mos (95%CI 24 - 29 mos); Group R, 24 mos; Group B, 14 mos; Group H, 20 mos; and Group W, 39 mos. The HR of R vs. H is 0.83 (95%CI 0.41-1.70, p= 0.618), B vs. H is 1.16 (95%CI 0.47-2.84, p= 0.748), and W vs. H is 0.52 (95%CI 0.25-1.08, p= 0.080), respectively. Conclusions: This study suggests that the prognosis of mCRC pts with HER2 amplification tends to be worse as compared to those with RAS / BRAF wt, similar to those with RAS mt, and better than those with BRAF mt, although these comparisons were not statistical significant.

Predictive biomarkers of response to cetuximab in Chinese patients with metastatic colorectal cancer.

2012 ◽  
Vol 30 (15_suppl) ◽  
pp. e14085-e14085
Author(s):  
Brigette Ma ◽  
Herbert Loong ◽  
Giok Siong Liem ◽  
Frankie Mo ◽  
Joanna Tong ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Metastatic Colorectal Cancer ◽  
Kras Mutation ◽  
Drug Response ◽  
Direct Sequencing ◽  
Pik3ca Mutation ◽  
Predictive Biomarkers ◽  
Chinese Patients ◽  
Braf Mutations ◽  
Pik3ca Mutations

e14085 Background: The paraffin-embedded tumor samples of 183 Chinese patients (pts) with metastatic colorectal cancer (mCRC) who had chemotherapy (chemo) over a period of 3.3 years were analyzed for the presence of KRAS, PIK3CA and BRAF mutations. Methods: PCR-direct sequencing was performed in micro-dissected tumor cells. The relationship between mutation and survival was evaluated using the Proportional Hazard Model, and relationship with drug response was evaluated with logistic regression. Multivariate analysis was used to adjust for the influence of age, sex, prior lines of chemo, use of bevacizumab (Bev) and the number of sites of metastases. Results: The median age was 58 yrs, over 50% of pts had > 2 lines of chemo and 50% had cetuximab. The prevalence of KRAS, BRAF and PI3KCA mutations were: 55%, 5%, 20% respectively. The prevalence of each KRAS mutation subtype was: G12D (36%), G12V (22%) and G13D (16%). KRAS mutation and prior use of Bev were independent prognostic factors with respective hazard ratios (HR) of 1.5 (95% CI = 1.05-2.16, p = 0.03) and 0.51 (95% CI = 0.3-0.87, p = 0.01). In the subgroup of patients who received cetuximab and chemotherapy in the first-line setting, KRAS mutation was associated with a lack of response to chemo with odd ratio (OR) of 0.1 (95% CI = 0.01-0.79, p=0.03). There was no correlation between the presence of BRAF and/ or PIK3CA mutations and OS or drug response. Five pts had co-expression of KRAS and PIK3CA mutations and none of them responded to cetuximab. Of the 14 pts who had complete response or prolonged disease stabilization to cetuximab-chemo, 4 had KRAS mutation, 1 had PIK3CA mutation and none had BRAF mutations. Conclusions: The prevalence of KRAS, BRAF and PIK3CA mutations reported in this Chinese cohort is consistent with reports from other non-Asian populations. KRAS mutation is an independent negative prognostic factor in chemo-treated pts with mCRC. KRAS mutation was associated with poorer response to 1st line cetuximab-based chemo.

Left- versus right-side metastatic colorectal cancer: Teasing out clinicopathologic drivers of disparity in survival.

2019 ◽  
Vol 37 (4_suppl) ◽  
pp. 623-623
Author(s):  
Shehara Ramyalini Mendis ◽  
Belinda Lee ◽  
Margaret Lee ◽  
Rachel Wong ◽  
Suzanne Kosmider ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Metastatic Colorectal Cancer ◽  
Progression Free Survival ◽  
Outcome Data ◽  
First Line ◽  
Braf Mutations ◽  
Primary Tumors ◽  
Multiple Factors ◽  
Rectal Cancers ◽  
Deficient Mismatch Repair

623 Background: Patients with metastatic colorectal cancer (mCRC) arising from a right sided colorectal cancer (RC) have an inferior survival versus patients with a left sided colorectal cancer (LC). Previous analyses have suggested that multiple factors contribute. Methods: The Treatment of Recurrent and Advanced Colorectal Cancer (TRACC) Registry has prospectively captured comprehensive data on consecutive mCRC patients since 2009. For this analysis LC were defined as primary tumors at or distal to the splenic flexure and included rectal cancers. We analysed patient, tumor, treatment and outcome data. Results: Of 2306 patients enrolled from July 2009–March 2018, median age 67 years (range 18–100), 1559 (67.6%) had a LC. Patients with a RC were older (median 71 vs 65 years, p < 0.001), more likely to be female (50.2% vs 36.9%, p < 0.001) and to have a Charlson score ≥ 3 (67.5% vs 54.6%, p < 0.001). More common in RC, where tested, were BRAF mutations (22.3% vs 7.2%, p < 0.001) and deficient mismatch repair (6.4% vs 1.5%, p < 0.001), but not RAS mutations. Peritoneal metastases were more frequent in RC (29.7% vs 14.9%, p < 0.001). RC patients were more likely to have their primary tumor resected (77.9% vs 70.6%, p < 0.001) and to receive less first-line chemotherapy (72.2% vs 78.7%, p = 0.001). Progression-free survival on first-line systemic therapy was inferior for RC patients (8.1 vs 10.8 months, HR 1.38, p < 0.001). Median overall survival (OS) for all RC patients was inferior (19.6 vs 27.5 months, HR 1.44, p < 0.001). Primary side remained a significant factor for OS in multivariate analysis. Conclusions: Our data confirms the poor prognosis associated with RC, contributed to by multiple factors. However, primary side remains significant even when adjusting for these, indicating the existence of further as yet undefined differences. [Table: see text]

A Critical Review of Second-generation anti-EGFR Monoclonal Antibodies in Metastatic Colorectal Cancer

2020 ◽  
Vol 21 ◽  
Author(s):  
Daniel Sur ◽  
Andrei Havasi ◽  
Alecsandra Gorzo ◽  
Claudia Burz
Keyword(s):  
Colorectal Cancer ◽  
Drug Resistance ◽  
Clinical Trials ◽  
Monoclonal Antibodies ◽  
Metastatic Colorectal Cancer ◽  
Second Generation ◽  
Current Data ◽  
Braf Mutations ◽  
Durable Response ◽  
Ongoing Research

Background: Anti-EGFR monoclonal antibodies (mAbs) have become a relevant solution for the treatment of patients with metastatic colorectal cancer. Current anti-EGFR monoclonal antibodies face a series of problems, including resistance and non-durable response, and RAS and BRAF mutations serve as exclusion criteria for treatment with anti-EGFR mAbs. Advances in molecular tumor profiling and information on subsequent pathways responsible for disease progression and drug resistance helped develop a new generation of anti-EGFR mAbs. These second-generation mAbs have been developed to overcome existing resistance mechanisms and to limit common side effects. For the moment, existing literature suggests that these novel anti-EGFR mAbs are far from finding their way to clinical practice soon. Objective: In this review, we summarize and evaluate current data regarding ongoing research and completed clinical trials for different second-generation anti-EGFR monoclonal antibodies. Conclusion: Anti-EGFR mAbs exhibit efficacy in advanced colorectal cancer, but second-generation mAbs failed to prove their benefit in the treatment of metastatic colorectal cancer. Understanding the biological basis of primary and acquired drug resistance could allow scientists to design better clinical trials and develop improved second-generation mAbs.

scholarly journals Evidence-Based Second-Line Treatment in RAS Wild-Type/Mutated Metastatic Colorectal Cancer in the Precision Medicine Era

2021 ◽  
Vol 22 (14) ◽  
pp. 7717
Author(s):  
Guido Giordano ◽  
Pietro Parcesepe ◽  
Giuseppina Bruno ◽  
Annamaria Piscazzi ◽  
Vincenzo Lizzi ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Metastatic Colorectal Cancer ◽  
Checkpoint Inhibitors ◽  
Line Treatment ◽  
Second Line ◽  
Wild Type ◽  
First Line ◽  
Braf Mutations ◽  
Mutational Status ◽  
First Line Treatment

Target-oriented agents improve metastatic colorectal cancer (mCRC) survival in combination with chemotherapy. However, the majority of patients experience disease progression after first-line treatment and are eligible for second-line approaches. In such a context, antiangiogenic and anti-Epidermal Growth Factor Receptor (EGFR) agents as well as immune checkpoint inhibitors have been approved as second-line options, and RAS and BRAF mutations and microsatellite status represent the molecular drivers that guide therapeutic choices. Patients harboring K- and N-RAS mutations are not eligible for anti-EGFR treatments, and bevacizumab is the only antiangiogenic agent that improves survival in combination with chemotherapy in first-line, regardless of RAS mutational status. Thus, the choice of an appropriate therapy after the progression to a bevacizumab or an EGFR-based first-line treatment should be evaluated according to the patient and disease characteristics and treatment aims. The continuation of bevacizumab beyond progression or its substitution with another anti-angiogenic agents has been shown to increase survival, whereas anti-EGFR monoclonals represent an option in RAS wild-type patients. In addition, specific molecular subgroups, such as BRAF-mutated and Microsatellite Instability-High (MSI-H) mCRCs represent aggressive malignancies that are poorly responsive to standard therapies and deserve targeted approaches. This review provides a critical overview about the state of the art in mCRC second-line treatment and discusses sequential strategies according to key molecular biomarkers.

scholarly journals Atypical, Non-V600 BRAF Mutations as a Potential Mechanism of Resistance to EGFR Inhibition in Metastatic Colorectal Cancer

2019 ◽  
pp. 1-10 ◽  
Author(s):  
Benny Johnson ◽  
Jonathan M. Loree ◽  
Alexandre A. Jacome ◽  
Shehara Mendis ◽  
Muddassir Syed ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Metastatic Colorectal Cancer ◽  
Stable Disease ◽  
Kinase Activity ◽  
Class Ii ◽  
Activity Level ◽  
Class Iii ◽  
Braf Mutations ◽  
Egfr Inhibition ◽  
Mechanism Of Resistance

PURPOSE Atypical, non-V600 BRAF ( aBRAF) mutations represent a rare molecular subtype of metastatic colorectal cancer (mCRC). Preclinical data are used to categorize aBRAF mutations into class II (intermediate to high levels of kinase activity, RAS independent) and III (low kinase activity level, RAS dependent). The clinical impact of these mutations on anti-EGFR treatment efficacy is unknown. PATIENTS AND METHODS Data from 2,084 patients with mCRC at a single institution and from an external cohort of 5,257 circulating tumor DNA (ctDNA) samples were retrospectively analyzed. Overall survival (OS) was calculated using Kaplan-Meier and log-rank tests. Statistical tests were two-sided. RESULTS BRAF mutations were harbored by 257 patients, including 36 with aBRAF mutations: 22 class III, 10 class II, four unclassified. For patients with aBRAF mCRC, median OS was 36.1 months, without a difference between classes, and median OS was 21.0 months for patients with BRAFV600E mCRC. In contrast to right-sided predominance of tumors with BRAFV600E mutation, 53% of patients with aBRAF mCRC had left-sided primary tumors. Concurrent RAS mutations were noted in 33% of patients with aBRAF mCRC, and 67% of patients had microsatellite stable disease. Among patients with aBRAF RAS wild-type mCRC who received anti-EGFR antibodies (monotherapy, n = 1; combination therapy, n = 10), no responses to anti-EGFR therapy were reported, and six patients (four with class III aBRAF mutations, one with class II, and one unclassified) achieved stable disease as best response. Median time receiving therapy was 4 months (range, 1 to 16). In the ctDNA cohort, there was an increased prevalence of aBRAF mutations and subclonal aBRAF mutations ( P < .001 for both) among predicted anti-EGFR exposed compared with nonexposed patients. CONCLUSION Efficacy of anti-EGFR therapy is limited in class II and III aBRAF mCRC. Detection of aBRAF mutations in ctDNA after EGFR inhibition may represent a novel mechanism of resistance.

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