19 Sep 2026

CRC Research Update — September 19, 2026

Creator: The CRC Digest
Published: 2026-09-19T11:24:35Z

Today's colorectal cancer research highlights

2 min read

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IMPORTANT: The CRC Digest curates and summarizes publicly available research for informational and educational purposes only. Nothing in this newsletter constitutes medical advice, diagnosis, or treatment recommendation. The information provided should not be used as a substitute for professional medical advice. Always seek the guidance of your physician or other qualified health provider with any questions regarding a medical condition or treatment. Content is generated with AI assistance and reviewed by the editorial team. We are not medical professionals. Individual results, treatments, and outcomes vary.

Signal Key

TRIAL DATA clinical trial results, efficacy data, survival endpoints TREATMENT new treatment options, regimen changes, combination therapies REGULATORY FDA/EMA approvals, guideline updates, NCCN/ESMO changes RESEARCH cancer biology, biomarker discoveries, resistance pathways SCREENING screening, colonoscopy guidelines, liquid biopsy, molecular profiling LIVING WITH CRC survivorship, quality of life, side effects, patient decision-making, caregiver support

CRC Research Update

RESEARCH
Gut microbiome may influence resistance to immunotherapy in MSI-H/dMMR colorectal cancer
A narrative review summarizes evidence that the gut microbiome-immune axis regulates antitumor immunity and may mediate both primary and acquired resistance to immune checkpoint inhibitors in MSI-H/dMMR CRC. (Front Cell Infect Microbiol)
LIVING WITH CRC
Study assesses impact of concurrent palliative care on metastatic CRC patients on systemic therapy
A retrospective study of 201 metastatic CRC patients assessed the impact of concurrent multidisciplinary palliative care alongside systemic therapy on patient-reported outcomes and healthcare utilization. (Front Oncol)
SCREENING
Newer colonoscope models and texture enhancement imaging improve adenoma detection
Analysis of 28,459 colonoscopies aimed to identify clinical and technological factors most strongly associated with increased adenoma detection rate, including newer colonoscope models and texture and color enhancement imaging. (Scand J Gastroenterol)
RESEARCH
Tumor mutational burden studied as prognostic marker in metastatic CRC receiving immunotherapy
A retrospective cohort study of 221 metastatic CRC patients receiving anti-PD-1/PD-L1 immunotherapy plus chemotherapy assessed tumor mutational burden as a biomarker for survival and quality of life outcomes. (Medicine)

🔬 Under 50 Spotlight

Research relevant to early-onset and younger CRC patients

German trial to test invitation strategies for CRC screening in adults under 50
The PETER trial will assess the effect of postal and digital invitations and reminders on faecal immunochemical test use and early detection among younger adults. (BMJ Open)
Machine learning models tested for mortality prediction in Tennessee early-onset CRC patients
A retrospective study of 3,467 Tennessee patients aged 20–49 compared machine learning algorithms for predicting all-cause mortality and 1-, 3-, and 5-year mortality. (Cancer Epidemiol)

🧬 Biomarker Spotlight

Research by genetic subtype. KRAS, BRAF, MSI-H, HER2, and more

Pathological complete response to pembrolizumab in dMMR CRC despite radiological residual disease
A case report describes a 70-year-old man with dMMR sigmoid colon cancer and liver metastases who achieved pathological complete response in both primary and metastatic lesions after preoperative pembrolizumab, despite imaging suggesting residual tumor. (Cureus)

Today's research spans microbiome mechanisms, supportive care integration, and screening technology advances.

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