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Updated: Jan 27, 2026
Spatial and Temporal Analysis of Active ERK in the C. elegans Germline
Published on: November 29, 2016
Phospho-ERK levels as predictors for chemotherapy of rectal carcinoma
Susanne Holck1, Louise Laurberg Klarskov2, Lars-Inge Larsson1,3
1Department of Pathology, Copenhagen University Hospital Hvidovre, DK-2650 Hvidovre, Denmark.
Abstract:
Treatment of rectal cancer has been vastly improved by advances in surgery and radiochemotherapy but remains an important cause of morbidity and mortality worldwide. A particular problem is the lack of predictive markers that can help to individualize treatment. The growth- and apoptosis-regulating signaling molecules ERK 1 and 2 are important to cancer growth and progression. They are activated through phosphorylation, which is initiated by a cascade involving the EGF receptor and RAS as upstream regulators. Moreover, in vitro studies indicate that phospho-ERKs interfere with 5-fluorouracil-based chemotherapy. Recently, we showed that high levels of phospho-ERKs in rectal cancer cells predict poor responses to neoadjuvant (preoperative) radiochemotherapy. We now report that preoperative phospho-ERK levels also can subdivide high-risk rectal cancer patients into a favorable and a poor prognostic group with respect to recurrence-free survival. Importantly, phospho-ERK levels were of predictive significance only in high-risk patients, who received adjuvant (postoperative) chemotherapy, but not in high-risk patients not receiving such therapy. Our results suggest that high cancer cell levels of phospho-ERK predict poor responsiveness to both preoperative and postoperative chemotherapy of rectal cancer.
Insights
High levels of phosphorylated ERK proteins in rectal cancer cells indicate poor response to chemotherapy. This finding helps identify patients who may benefit from tailored treatment strategies for better outcomes.
Area of Science:
- Oncology
- Molecular Biology
- Cancer Signaling
Background:
- Rectal cancer treatment faces challenges due to a lack of predictive markers for personalized therapy.
- ERK 1 and 2 signaling molecules regulate cancer growth and apoptosis, with activation via phosphorylation.
- Phospho-ERKs may interfere with 5-fluorouracil chemotherapy, impacting treatment efficacy.
Purpose of the Study:
- To investigate the predictive value of preoperative phospho-ERK levels in rectal cancer patients.
- To determine if phospho-ERK levels can stratify high-risk patients based on prognostic outcomes.
- To assess the association between phospho-ERK levels and response to neoadjuvant and adjuvant chemotherapy.
Main Methods:
- Analysis of preoperative phospho-ERK levels in rectal cancer cells.
- Correlation of phospho-ERK levels with treatment response and recurrence-free survival.
- Stratification of high-risk patients based on phospho-ERK levels and adjuvant chemotherapy status.
Main Results:
- High preoperative phospho-ERK levels predict poor response to neoadjuvant radiochemotherapy.
- Preoperative phospho-ERK levels can stratify high-risk patients into favorable and poor prognostic groups for recurrence-free survival.
- Phospho-ERK levels showed predictive significance in high-risk patients receiving adjuvant chemotherapy.
Conclusions:
- High cancer cell phospho-ERK levels predict poor responsiveness to both preoperative and postoperative chemotherapy in rectal cancer.
- Phospho-ERK levels serve as a potential predictive marker for individualizing rectal cancer treatment.
- Further research is warranted to integrate phospho-ERK assessment into clinical decision-making for rectal cancer patients.
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