Colorectal cancer
The cancer where screening works best and where immunotherapy can make some tumours disappear entirely, yet most metastatic disease still depends on chemotherapy.
Colorectal cancer is the third most common cancer and second leading cause of cancer death worldwide (about 1.9 million cases and 900,000 deaths a year). It is the disease where screening works best: removing adenomas at colonoscopy prevents cancer, and stool and blood tests catch it early. Most cases arise through the adenoma-carcinoma sequence driven by APC loss, KRAS mutation, and TP53 loss (chromosomal instability); about 15% arise through mismatch-repair deficiency (dMMR/MSI-high), either sporadically via MLH1 methylation or through Lynch syndrome. Incidence is rising sharply in adults under 50 for reasons that remain unexplained.
Treatment splits along biology. Localised disease is cured by surgery, with adjuvant FOLFOX or CAPOX for stage III (3 months suffices for low-risk disease) and, since ATOMIC (2025), atezolizumab added for dMMR stage III. Rectal cancer uses total neoadjuvant therapy with chemoradiation and increasingly organ preservation; dMMR rectal cancer can be treated with six months of dostarlimab and no surgery at all (AZUR-1, FDA priority review). Metastatic disease is stratified by RAS, BRAF, HER2, MSI, and sidedness: left-sided RAS/BRAF wild-type tumours get chemotherapy with an EGFR antibody (PARADIGM); others get bevacizumab; BRAF V600E disease gets encorafenib + cetuximab + chemotherapy first line (BREAKWATER, OS doubled to 30 months); KRAS G12C disease gets sotorasib or adagrasib with an EGFR antibody; HER2-amplified disease gets tucatinib + trastuzumab or T-DXd; dMMR disease gets pembrolizumab or nivolumab + ipilimumab first line, with 5-year survival above 50%. Later lines: trifluridine/tipiracil + bevacizumab (SUNLIGHT), fruquintinib (FRESCO-2), regorafenib. Liver-limited metastases are resected or ablated with curative intent in a meaningful minority.
Unsolved: the 95% of metastatic tumours that are microsatellite-stable remain immunotherapy-resistant; KRAS G12D (the commonest mutation) is undrugged; early-onset CRC has no explanation and no screening; ctDNA can identify who will relapse after surgery but no escalation strategy has yet been shown to change that (ALTAIR negative); and anti-EGFR resistance via RAS/EGFR ectodomain clones, MET amplification, and HER2 amplification is universal in metastatic disease.
State of the art today
- ctDNA-guided adjuvant therapy.
- Immunotherapy cures in dMMR without surgery.
- First-line targeted therapy for BRAF V600E.
- Adjuvant atezolizumab for dMMR stage III colon cancer halves recurrence (ATOMIC, 2025): the first adjuvant IO success in CRC.
- ctDNA-guided de-escalation is proven (DYNAMIC); blood-based screening is FDA-approved (Shield, 2024) and Medicare-covered.
- KRAS G12C and HER2 have approved targeted combinations; RAS(ON) inhibitors are entering phase 3 for the remaining KRAS alleles.
Show survival figures (3)
Averages across everyone diagnosed, often years ago. Your stage, subtype, age, fitness and the treatment you receive matter more than the average, and the numbers are improving quickly.
- dMMR disease: immunotherapy first line gives median OS over 6 years (KEYNOTE-177); neoadjuvant IO achieves 68% pCR and 100% 3-year DFS in colon (NICHE-2) and complete organ preservation in rectal cancer (dostarlimab, AZUR-1).
- BRAF V600E first-line targeted triplet doubled survival to 30 months (BREAKWATER); full approval in 2026.
- Sidedness plus RAS/BRAF status selects anti-EGFR therapy, yielding median OS near 38 months first line (PARADIGM).
Show survival figures (1)
Averages across everyone diagnosed, often years ago. Your stage, subtype, age, fitness and the treatment you receive matter more than the average, and the numbers are improving quickly.
- ~1.9 million cases and ~900,000 deaths per year worldwide; third most common cancer, second leading cause of cancer death; incidence rising ~2% per year in adults under 50 in high-income countries.
Where the cases are
Site: Colorectum (colon, rectum, anus). World: 1,926,425 new cases, 904,019 deaths.
| # | Country | New cases | Deaths | Incidence ASR |
|---|---|---|---|---|
| 1 | China | 517,106 | 240,010 | |
| 2 | United States of America | 160,186 | 54,614 | |
| 3 | Japan | 145,756 | 60,473 | |
| 4 | Russian Federation | 83,693 | 41,447 | |
| 5 | India | 70,038 | 40,993 | |
| 6 | Germany | 62,544 | 26,544 | |
| 7 | Brazil | 60,118 | 28,884 | |
| 8 | Italy | 54,784 | 24,188 | |
| 9 | France (metropolitan) | 51,636 | 21,218 | |
| 10 | United Kingdom | 49,429 | 22,868 |
Colonoscopy, FIT, Cologuard, Shield blood test from age 45.
Surgery; adjuvant chemotherapy guided by risk and (in trials) ctDNA; exercise programme.
Doublet/triplet chemotherapy + biologic by genotype; targeted combinations for BRAF, KRAS G12C, HER2.
Checkpoint inhibitors; organ preservation in rectal cancer.
Colonoscopy every 10 years, annual FIT, multitarget stool DNA every 3 years, CT colonography, or the Shield blood test every 3 years; start at 45 (USPSTF 2021). Lynch carriers: colonoscopy every 1-2 years from age 20-25.
Surgical resection; observation for stage I and low-risk stage II. High-risk stage II (T4, obstruction, <12 nodes, LVI): consider 3-6 months fluoropyrimidine ± oxaliplatin; ctDNA-negative patients can safely omit (DYNAMIC). dMMR stage II derives no benefit from 5-FU alone.
Resection then adjuvant CAPOX for 3 months (T1-3 N1, low risk) or FOLFOX/CAPOX for 6 months (T4 or N2), per IDEA.
Resection then FOLFOX + atezolizumab for 12 months (ATOMIC, 3-year DFS 86% vs 77%). Neoadjuvant nivolumab + ipilimumab (NICHE-2) is an alternative under evaluation.
Total neoadjuvant therapy: short-course radiation or long-course chemoradiation plus FOLFOX/CAPOX, then TME surgery or watch-and-wait for clinical complete response (OPRA). Non-operative management for select cCR.
Dostarlimab monotherapy for 6 months with organ preservation (MSK cohort 100% cCR; AZUR-1 registrational, PDUFA February 2027). Chemoradiation and surgery reserved for non-responders.
Pembrolizumab (KEYNOTE-177) or nivolumab + ipilimumab (CheckMate 8HW, PFS 54 months); nivolumab monotherapy alternative. Chemotherapy reserved for IO-refractory disease.
FOLFOX or FOLFIRI + panitumumab or cetuximab (PARADIGM OS 37.9 months); bevacizumab if anti-EGFR contraindicated. Maintenance fluoropyrimidine ± biologic after induction.
FOLFOX, FOLFIRI, or FOLFOXIRI + bevacizumab; anti-EGFR contraindicated. KRAS G12D and other alleles: RAS(ON) inhibitors in trials.
First line: encorafenib + cetuximab + mFOLFOX6 or FOLFIRI (BREAKWATER, OS 30.3 vs 15.1 months). Later line: encorafenib + cetuximab (BEACON).
Sotorasib + panitumumab (CodeBreaK 300) or adagrasib + cetuximab after chemotherapy; first-line trials ongoing.
Tucatinib + trastuzumab (MOUNTAINEER) or trastuzumab deruxtecan 5.4 mg/kg (DESTINY-CRC02) after chemotherapy; MOUNTAINEER-03 tests first-line use.
Trifluridine/tipiracil + bevacizumab (SUNLIGHT, OS 10.8 months), then fruquintinib (FRESCO-2) or regorafenib; NTRK inhibitor if fusion; clinical trials.
Resection, thermal ablation, or SBRT with curative intent after multidisciplinary review; perioperative chemotherapy; 5-year survival 30-50% after complete resection of liver metastases.
Subtypes & biomarkers
top- Chromosomal instability / APC-KRAS-TP53 pathway (~80%)
- Mismatch-repair deficient / MSI-high (~15% localised, ~5% metastatic)
- Lynch syndrome (hereditary dMMR, ~3%)
- BRAF V600E (~8-10%, right-sided, poor prognosis)
- KRAS-mutant (~45%; G12C ~3-4%, G12D ~13%)
- HER2-amplified (~3-5%, RAS wild-type, left-sided)
- Left-sided vs right-sided (embryologic origin drives biology)
- Consensus molecular subtypes CMS1-4
- Early-onset (<50 years)
- Rectal vs colon (different local therapy)
- RAS (KRAS/NRAS)
- BRAF V600E
- MSI/dMMR
- HER2
- NTRK
- sidedness
- ctDNA MRD
- RAS (KRAS and NRAS exons 2-4) for anti-EGFR eligibility
- MMR/MSI status (universal testing at diagnosis)
- HER2 amplification (IHC/ISH or NGS)
- Primary tumour sidedness
- NTRK fusions (rare)
- POLE/POLD1 (ultramutated, IO-responsive)
- ctDNA MRD after surgery (Signatera, Guardant Reveal)
- CEA (monitoring)
- UGT1A1*28 (irinotecan dosing) and DPYD (fluoropyrimidine toxicity)
- Germline testing for Lynch when dMMR or young onset
Target prevalence in this cancer
| Target / alteration | Prevalence | Measure | Source |
|---|---|---|---|
| EGFR Benefit restricted to RAS/BRAF wild-type (~40%) | 100% | Wild-type EGFR is the antibody target | Wikipedia |
| CEACAM5 | 80-90% | IHC, moderate-high | Wikipedia |
| TP53 | 55-60% | TP53 mutation | cBioPortal (TCGA) |
| KRAS G12C ~3-4% | 40-45% | Any KRAS mutation | cBioPortal (TCGA) |
| PIK3CA / PI3K-alpha | 15-20% | Activating mutation | cBioPortal (TCGA) |
| WRN helicase (MSI-high cancers) | 15% | MSI-H (WRN-dependent) | |
| BRAF | 8-12% | V600E mutation | cBioPortal (TCGA) |
| HER2 RAS wild-type enriched | 3-5% | Amplification/IHC 3+ | Wikipedia |
| NTRK Enriched in MSI-high | <1% | Fusion | Wikipedia |
| VEGF / VEGFR | n/a | No selection biomarker for bevacizumab | Wikipedia |
How common each drug target or alteration is in this cancer. Population-level and approximate; see the target page for detail. Full matrix.
- 19575-Fluorouracil synthesised
Heidelberger; still the backbone of colorectal chemotherapy 70 years later.
- 1988Vogelstein's adenoma-carcinoma sequence
APC → KRAS → TP53 model of colorectal tumorigenesis defines the genetic paradigm of cancer.
- 1990MOSAIC and the adjuvant era; Lynch syndrome genes identified (1993)
Adjuvant 5-FU/levamisole shown to improve survival in stage III (1990); MSH2/MLH1 cloned 1993.
- 2000Irinotecan and oxaliplatin combinations
FOLFIRI and FOLFOX double median metastatic survival from ~12 to ~20 months.
- 2004Bevacizumab and cetuximab approved
- 2004Bevacizumab and cetuximab approved
First anti-angiogenic and first anti-EGFR antibodies; MOSAIC establishes adjuvant FOLFOX.
- 2008KRAS mutation predicts anti-EGFR failure
Retrospective CRYSTAL/OPUS analyses; first negative predictive biomarker in CRC; RAS testing becomes mandatory.
- 2014Extended RAS and sidedness
FIRE-3 and CALGB 80405 subgroups show anti-EGFR benefit only in left-sided RAS wild-type tumours.
- 2015Consensus molecular subtypes; trifluridine/tipiracil approved
CMS1-4 classification; RECOURSE establishes TAS-102 in refractory disease.
- 2017Pembrolizumab for MSI-high tumours
- 2017Pembrolizumab: first tumour-agnostic approval, dMMR
Based on KEYNOTE-016/164 and others; dMMR CRC becomes the model immunotherapy-responsive GI tumour.
- 2018IDEA: 3 months of adjuvant CAPOX suffices for low-risk stage III
- 2020KEYNOTE-177: chemotherapy-free first line for dMMR; BEACON: encorafenib + cetuximab for BRAF
- 2022Dostarlimab: 100% complete response in dMMR rectal cancer
- 2022Dostarlimab: 100% complete responses in dMMR rectal cancer; PARADIGM; DYNAMIC
Organ preservation without surgery (Cercek, NEJM); panitumumab beats bevacizumab in left-sided disease; ctDNA-guided de-escalation.
- 2023SUNLIGHT and FRESCO-2 expand late-line options; tucatinib + trastuzumab first HER2 regimen; NICHE-2 pCR 68%
- 2024Shield: first blood test for CRC screening
- 2024Shield blood test approved for screening; BREAKWATER accelerated approval; CheckMate 8HW
- 2025ATOMIC: adjuvant atezolizumab for dMMR stage III; sotorasib + panitumumab approved; CHALLENGE exercise trial
- 2026BREAKWATER full approval; first-line BRAF targeted therapy
- 2026BREAKWATER FOLFIRI cohort and full approval; AZUR-1 priority review; T-DXd and RAS(ON) inhibitors advance
Open problems
- MSS metastatic disease is immunotherapy-resistant.
- Early-onset CRC causes unknown.
- KRAS G12D (most common) undrugged.
- Microsatellite-stable metastatic disease (95%) remains immunotherapy-resistant; liver metastases actively suppress systemic immunity.
- KRAS G12D and G12V, the most common drivers, have no approved inhibitor; RAS(ON) inhibitors are the first credible attempt.
- Early-onset colorectal cancer is rising ~2% per year with no established cause and no screening before 45.
- ctDNA identifies who will relapse but no escalation strategy has changed outcomes (ALTAIR negative).
- Anti-EGFR resistance is universal; rechallenge and ctDNA-guided sequencing are unproven in phase 3.
- Rectal cancer organ preservation lacks randomised comparison against surgery in pMMR disease.
- Peritoneal metastases respond poorly to systemic therapy; HIPEC with oxaliplatin failed (PRODIGE 7).
- Disparities: screening uptake and outcomes differ sharply by race, income, and geography.
Trials
topRecruiting now (live from ClinicalTrials.gov)
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Landmark trials in OnCo
Expert centres
topCentres linked to this cancer in OnCo
- via this cancer, AZUR-1, Dostarlimab
- via Trastuzumab deruxtecan
- Johns Hopkins Hospital / Sidney Kimmel Comprehensive Cancer CenterBaltimore, USNewsweek oncology #10NCI comprehensivevia this cancer, Pembrolizumab, Microsatellite instability (MSI-H) / mismatch repair deficiency (dMMR)
- via this cancer, CIRCULATE-Japan (GALAXY / VEGA / ALTAIR), Trastuzumab deruxtecan
- via Robotic & minimally invasive surgery
- via Encorafenib
- via SBRT / SABR (stereotactic radiotherapy)
- UCSF Helen Diller Family Comprehensive Cancer CenterSan Francisco, USNewsweek oncology #33NCI comprehensivevia KRAS
- via this cancer, NICHE-2
- via this cancer, DYNAMIC, MRD / molecular residual disease testing, Cytotoxic chemotherapy
- National Cancer Center Hospital EastKashiwa, Chiba, JPvia this cancer, Trastuzumab deruxtecan, Nivolumab, MRD / molecular residual disease testing
- A.C. Camargo Cancer CenterSão Paulo, BRvia this cancer, Robotic & minimally invasive surgery, TP53
- Alliance for Clinical Trials in OncologyChicago, IL, USvia this cancer, Pembrolizumab, ATOMIC (Alliance A021502)
- Canadian Cancer Trials Group (CCTG)Kingston, ON, CAvia this cancer, Exercise & lifestyle oncology, SBRT / SABR (stereotactic radiotherapy)
- via this cancer, SBRT / SABR (stereotactic radiotherapy), Robotic & minimally invasive surgery
- Comprehensive Cancer Center Freiburg (CCCF)Freiburg im Breisgau, DEvia this cancer, IMRT / IGRT (modern external beam), SBRT / SABR (stereotactic radiotherapy)
- IRCCS Humanitas Research HospitalRozzano (Milan), ITvia Atezolizumab, IMRT / IGRT (modern external beam), SBRT / SABR (stereotactic radiotherapy)
- Istituto di Candiolo IRCCS – FPOCandiolo, ITvia this cancer, Trastuzumab, KRAS
- via this cancer, Nivolumab, Ipilimumab
- via this cancer, IMRT / IGRT (modern external beam), TP53
- Rajiv Gandhi Cancer Institute and Research CentreNew Delhi, INvia IMRT / IGRT (modern external beam), SBRT / SABR (stereotactic radiotherapy), Robotic & minimally invasive surgery
- Tawam HospitalAl Ain, AEvia this cancer, IMRT / IGRT (modern external beam), Johns Hopkins Hospital / Sidney Kimmel Comprehensive Cancer Center
- UMC Utrecht Cancer CenterUtrecht, NLvia this cancer, IMRT / IGRT (modern external beam), SBRT / SABR (stereotactic radiotherapy)
- via this cancer, IMRT / IGRT (modern external beam), Cytotoxic chemotherapy
- Velindre Cancer CentreCardiff, GBvia this cancer, IMRT / IGRT (modern external beam), SBRT / SABR (stereotactic radiotherapy)
- Zhongshan Hospital, Fudan UniversityShanghai, CNvia this cancer, Thermal ablation (RFA, microwave, cryo), Robotic & minimally invasive surgery
- Aarhus University HospitalAarhus, DKvia IMRT / IGRT (modern external beam), SBRT / SABR (stereotactic radiotherapy)
- American Society for Radiation OncologyArlington, VA, USvia IMRT / IGRT (modern external beam), SBRT / SABR (stereotactic radiotherapy)
- Apollo Hospitals (Apollo Cancer Centres)Chennai, INvia SBRT / SABR (stereotactic radiotherapy), Robotic & minimally invasive surgery
- via this cancer, SBRT / SABR (stereotactic radiotherapy)
- via this cancer, KRAS
- via this cancer, Colorectal cancer screening (colonoscopy, FIT, stool DNA, blood)
- Centre Oscar LambretLille, FRvia IMRT / IGRT (modern external beam), SBRT / SABR (stereotactic radiotherapy)
- via KRAS, TP53
- via MRD / molecular residual disease testing, IMRT / IGRT (modern external beam)
- Cleveland Clinic Abu DhabiAbu Dhabi, AEvia this cancer, Robotic & minimally invasive surgery
- via Nivolumab, Ipilimumab
- via KRAS, TP53
- European Society for Radiotherapy and OncologyBrussels, BEvia IMRT / IGRT (modern external beam), SBRT / SABR (stereotactic radiotherapy)
- FDA Oncology Center of ExcellenceSilver Spring, MD, USvia MRD / molecular residual disease testing, Tumour-agnostic (tissue-agnostic) approval
- First Affiliated Hospital of Sun Yat-sen UniversityGuangzhou, CNvia this cancer, Robotic & minimally invasive surgery
- Fundación Arturo López PérezSantiago, CLvia SBRT / SABR (stereotactic radiotherapy), Robotic & minimally invasive surgery
- German Hodgkin Study GroupCologne, DEvia Nivolumab, Cytotoxic chemotherapy
- GOG FoundationPhiladelphia, PA, USvia Pembrolizumab, Dostarlimab
- via IMRT / IGRT (modern external beam), Robotic & minimally invasive surgery
- Hacettepe University Cancer InstituteAnkara, TRvia IMRT / IGRT (modern external beam), SBRT / SABR (stereotactic radiotherapy)
- via this cancer, IMRT / IGRT (modern external beam)
- Ho Chi Minh City Oncology HospitalHo Chi Minh City, VNvia this cancer, IMRT / IGRT (modern external beam)
- Hokkaido University HospitalSapporo, JPvia IMRT / IGRT (modern external beam), SBRT / SABR (stereotactic radiotherapy)
- Hospital de Clínicas de Porto AlegrePorto Alegre, BRvia this cancer, TP53
- via this cancer, Trastuzumab
- Hospital Universitari i Politècnic La FeValencia, ESvia this cancer, SBRT / SABR (stereotactic radiotherapy)
- Hunan Cancer HospitalChangsha, CNvia this cancer, IMRT / IGRT (modern external beam)
- via this cancer, MRD / molecular residual disease testing
- Institut Jules BordetBrussels, BEvia Pembrolizumab, Trastuzumab
- Institut National d'Oncologie, RabatRabat, MAvia this cancer, IMRT / IGRT (modern external beam)
- Institut Salah AzaïezTunis, TNvia this cancer, IMRT / IGRT (modern external beam)
- Institute of Oncology LjubljanaLjubljana, SIvia this cancer, IMRT / IGRT (modern external beam)
- Instituto Alexander FlemingBuenos Aires, ARvia this cancer, Trastuzumab
- via this cancer, IMRT / IGRT (modern external beam)
- IRCCS Ospedale San RaffaeleMilan, ITvia Trastuzumab, Robotic & minimally invasive surgery
- via Robotic & minimally invasive surgery, TP53
- Istituto Oncologico Veneto IRCCSPadua, ITvia this cancer, Trastuzumab
- via MRD / molecular residual disease testing, IMRT / IGRT (modern external beam)
- Kaiser Permanente Division of ResearchOakland, CA, USvia this cancer, Colorectal cancer screening (colonoscopy, FIT, stool DNA, blood)
- Keio University HospitalTokyo, JPvia this cancer, Robotic & minimally invasive surgery
- via Nivolumab, KRAS
- via this cancer, IMRT / IGRT (modern external beam)
- via this cancer, IMRT / IGRT (modern external beam)
- via this cancer, Colorectal cancer screening (colonoscopy, FIT, stool DNA, blood)
- National Institute of Oncology, HungaryBudapest, HUvia this cancer, IMRT / IGRT (modern external beam)
- National Taiwan University HospitalTaipei, TWvia this cancer, Atezolizumab
- via this cancer, IMRT / IGRT (modern external beam)
- NSABP FoundationPittsburgh, PA, USvia this cancer, Trastuzumab
- via this cancer, Exercise & lifestyle oncology
- Osaka International Cancer InstituteOsaka, JPvia this cancer, Robotic & minimally invasive surgery
- via this cancer, IMRT / IGRT (modern external beam)
- Rambam Health Care CampusHaifa, ILvia this cancer, IMRT / IGRT (modern external beam)
- Royal Adelaide HospitalAdelaide, AUvia this cancer, IMRT / IGRT (modern external beam)
- via this cancer, Robotic & minimally invasive surgery
- via IMRT / IGRT (modern external beam), SBRT / SABR (stereotactic radiotherapy)
- Siriraj Hospital, Mahidol UniversityBangkok, THvia IMRT / IGRT (modern external beam), Robotic & minimally invasive surgery
- Tel Aviv Sourasky Medical CenterTel Aviv, ILvia this cancer, IMRT / IGRT (modern external beam)
- via IMRT / IGRT (modern external beam), Robotic & minimally invasive surgery
- TROG Cancer ResearchNewcastle, NSW, AUvia IMRT / IGRT (modern external beam), SBRT / SABR (stereotactic radiotherapy)
- via this cancer, Autogene cevumeran
- via this cancer, Cytotoxic chemotherapy
- University of Malaya Medical CentreKuala Lumpur, MYvia this cancer, IMRT / IGRT (modern external beam)
- Weizmann Institute of ScienceRehovot, ILvia this cancer, TP53
- via Nivolumab, Ipilimumab
- via Nivolumab
- Aichi Cancer CenterNagoya, JPvia this cancer
- American Society of HematologyWashington, DC, USvia MRD / molecular residual disease testing
- via this cancer
- via this cancer
- via Robotic & minimally invasive surgery
- Breast Cancer TrialsNewcastle, NSW, AUvia Trastuzumab
- Breast International Group (BIG)Brussels, BEvia Trastuzumab
- Butaro Cancer Center of ExcellenceButaro, RWvia Cytotoxic chemotherapy
- Cancer Care Alberta (Alberta Health Services)Calgary, AB, CAvia this cancer
- via MRD / molecular residual disease testing
- Cancer Council AustraliaSydney, AUvia this cancer
- Cancer Grand ChallengesLondon, GBvia this cancer
- via this cancer
- via MRD / molecular residual disease testing
- Cancer Research UK Manchester InstituteManchester, GBvia MRD / molecular residual disease testing
- Central Drugs Standard Control OrganizationNew Delhi, INvia Trastuzumab
- Centre Antoine LacassagneNice, FRvia IMRT / IGRT (modern external beam)
- Chang Gung Memorial HospitalTaoyuan, TWvia Robotic & minimally invasive surgery
- via this cancer
- via IMRT / IGRT (modern external beam)
- Children's Cancer and Leukaemia GroupLeicester, GBvia MRD / molecular residual disease testing
- Chinese PLA General HospitalBeijing, CNvia Robotic & minimally invasive surgery
- Chris O'Brien LifehouseSydney, AUvia Robotic & minimally invasive surgery
- via this cancer
- Edinburgh Cancer Centre / CRUK Scotland CentreEdinburgh, GBvia this cancer
- ETOP IBCSG Partners FoundationBern, CHvia Atezolizumab
- European Hematology AssociationThe Hague, NLvia MRD / molecular residual disease testing
- European Society for Clinical Nutrition and MetabolismLuxembourg, LUvia Exercise & lifestyle oncology
- via Robotic & minimally invasive surgery
- European Society of Surgical OncologyBrussels, BEvia Robotic & minimally invasive surgery
- Frederick National Laboratory for Cancer ResearchFrederick, MD, USvia KRAS
- GEICAM Spanish Breast Cancer GroupMadrid, ESvia Cytotoxic chemotherapy
- Geneva University Hospitals (HUG)Geneva, CHvia IMRT / IGRT (modern external beam)
- via Trastuzumab
- German Lymphoma AllianceHomburg, DEvia Cytotoxic chemotherapy
- GIMEMARome, ITvia MRD / molecular residual disease testing
- Groote Schuur Hospital / University of Cape TownCape Town, ZAvia IMRT / IGRT (modern external beam)
- Hadassah Medical CenterJerusalem, ILvia SBRT / SABR (stereotactic radiotherapy)
- via SBRT / SABR (stereotactic radiotherapy)
- HealthCare Global EnterprisesBengaluru, INvia SBRT / SABR (stereotactic radiotherapy)
- Hospital Universitario 12 de OctubreMadrid, ESvia MRD / molecular residual disease testing
- HOVONRotterdam, NLvia MRD / molecular residual disease testing
- Howard Hughes Medical InstituteChevy Chase, MD, USvia Johns Hopkins Hospital / Sidney Kimmel Comprehensive Cancer Center
- via this cancer
- via this cancer
- Indiana University Melvin and Bren Simon Comprehensive Cancer CenterIndianapolis, IN, USNCI comprehensivevia Cytotoxic chemotherapy
- Institut BergoniéBordeaux, FRvia IMRT / IGRT (modern external beam)
- Institut National du CancerBoulogne-Billancourt, FRvia Tumour-agnostic (tissue-agnostic) approval
- via this cancer
- via IMRT / IGRT (modern external beam)
- International Extranodal Lymphoma Study GroupBellinzona, CHvia IMRT / IGRT (modern external beam)
- Istanbul University Institute of OncologyIstanbul, TRvia IMRT / IGRT (modern external beam)
- Juravinski Cancer Centre / Escarpment Cancer Research InstituteHamilton, ON, CAvia IMRT / IGRT (modern external beam)
- Kenyatta National HospitalNairobi, KEvia IMRT / IGRT (modern external beam)
- via this cancer
- King Hussein Cancer CenterAmman, JOvia this cancer
- Koo Foundation Sun Yat-Sen Cancer CenterTaipei, TWvia SBRT / SABR (stereotactic radiotherapy)
- Korean Cancer Study GroupSeoul, KRvia this cancer
- Korle Bu Teaching HospitalAccra, GHvia IMRT / IGRT (modern external beam)
- Kyoto University HospitalKyoto, JPvia Nivolumab
- Kyushu University HospitalFukuoka, JPvia Robotic & minimally invasive surgery
- Lagos University Teaching HospitalLagos, NGvia IMRT / IGRT (modern external beam)
- via Pembrolizumab
- Leiden University Medical CenterLeiden, NLvia this cancer
- Lustgarten FoundationWoodbury, NY, USvia Johns Hopkins Hospital / Sidney Kimmel Comprehensive Cancer Center
- via this cancer
- via this cancer
- Multinational Association of Supportive Care in CancerAurora, ON, CAvia Exercise & lifestyle oncology
- via this cancer
- National Cancer Center KoreaGoyang, KRvia this cancer
- National Cancer Centre SingaporeSingapore, SGvia this cancer
- via IMRT / IGRT (modern external beam)
- via Robotic & minimally invasive surgery
- Nordic Lymphoma GroupStockholm, SEvia Cytotoxic chemotherapy
- Ocean Road Cancer InstituteDar es Salaam, TZvia IMRT / IGRT (modern external beam)
- Ontario Institute for Cancer ResearchToronto, ON, CAvia this cancer
- via this cancer
- Peking Union Medical College HospitalBeijing, CNvia Robotic & minimally invasive surgery
- Peking University Cancer HospitalBeijing, CNvia this cancer
- via Trastuzumab deruxtecan
- via this cancer
- Queen Mary Hospital / University of Hong KongHong Kong, HKvia Robotic & minimally invasive surgery
- Ramathibodi Hospital, Mahidol UniversityBangkok, THvia this cancer
- Rigshospitalet – Copenhagen University HospitalCopenhagen, DKvia IMRT / IGRT (modern external beam)
- Rosalind and Morris Goodman Cancer Institute, McGill UniversityMontréal, QC, CAvia this cancer
- Seoul St. Mary's HospitalSeoul, KRvia Robotic & minimally invasive surgery
- Shaare Zedek Medical CenterJerusalem, ILvia this cancer
- Shanghai Chest HospitalShanghai, CNvia Robotic & minimally invasive surgery
- Shanghai Pulmonary HospitalShanghai, CNvia Robotic & minimally invasive surgery
- Shizuoka Cancer CenterNagaizumi, Shizuoka, JPvia this cancer
- via this cancer
- Society of Gynecologic OncologyChicago, IL, USvia Robotic & minimally invasive surgery
- Society of Surgical OncologyRosemont, IL, USvia Robotic & minimally invasive surgery
- SOLTI Cancer Research GroupBarcelona, ESvia Trastuzumab
- Sunnybrook Odette Cancer CentreToronto, ON, CAvia SBRT / SABR (stereotactic radiotherapy)
- SWOG Cancer Research NetworkPortland, OR, USvia Nivolumab
- via MRD / molecular residual disease testing
- via MRD / molecular residual disease testing
- Taipei Veterans General HospitalTaipei, TWvia this cancer
- Tata Medical Center, KolkataKolkata, INvia IMRT / IGRT (modern external beam)
- via this cancer
- Tohoku University HospitalSendai, JPvia this cancer
- via this cancer
- via Trastuzumab
- Uganda Cancer InstituteKampala, UGvia Cytotoxic chemotherapy
- UNICANCERParis, FRvia this cancer
- via this cancer
- University of Maryland Marlene and Stewart Greenebaum Comprehensive Cancer CenterBaltimore, MD, USNCI comprehensivevia SBRT / SABR (stereotactic radiotherapy)
- via Cetuximab
- via this cancer
- via this cancer
- UZ Leuven / Leuven Cancer InstituteLeuven, BEvia this cancer
- via this cancer
- via IMRT / IGRT (modern external beam)
- Walter and Eliza Hall Institute of Medical ResearchMelbourne, AUvia this cancer
- Wellcome Sanger InstituteHinxton, GBvia this cancer
- West Japan Oncology GroupOsaka, JPvia this cancer
- via Exercise & lifestyle oncology
- Zhejiang Cancer HospitalHangzhou, CNvia IMRT / IGRT (modern external beam)
Questions to ask
topQuestions to ask your oncologist about Colorectal cancer
Newly diagnosed
- What is my exact diagnosis, stage, and grade, and which tests established them?Why: Everything else follows from an accurate stage and subtype.
- Which biomarkers have been tested on my tumour (for example RAS, BRAF V600E, MSI/dMMR, HER2, NTRK), and what were the results?Why: These results decide eligibility for targeted therapy, immunotherapy, and trials.
- Which subtype is my cancer, and does that change the recommended treatment?Why: Recognised subtypes for this cancer include Chromosomal instability / APC-KRAS-TP53 pathway, Mismatch-repair deficient / MSI-high, Lynch syndrome.
- Is germline (inherited) genetic testing recommended for me or my family?Why: Inherited variants can change treatment and matter for relatives.
Screening
- For my situation (screening), which of the standard options do you recommend and why?Why: Guideline options include: Colonoscopy, FIT, Cologuard, Shield blood test from age 45.
- Am I a candidate for Shield, and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
Stage II-III
- For my situation (stage ii-iii), which of the standard options do you recommend and why?Why: Guideline options include: Surgery; adjuvant chemotherapy guided by risk and (in trials) ctDNA; exercise programme.
- Am I a candidate for Signatera, and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
- How do the results of DYNAMIC apply to someone like me?Why: Trial populations differ from individual patients; ask how closely you match.
Metastatic, MSS
- For my situation (metastatic, mss), which of the standard options do you recommend and why?Why: Guideline options include: Doublet/triplet chemotherapy + biologic by genotype; targeted combinations for BRAF, KRAS G12C, HER2.
- Am I a candidate for Encorafenib, Sotorasib, Adagrasib or related drugs, and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
Metastatic, dMMR
- For my situation (metastatic, dmmr), which of the standard options do you recommend and why?Why: Guideline options include: Checkpoint inhibitors; organ preservation in rectal cancer.
- Am I a candidate for Pembrolizumab, Nivolumab, Dostarlimab, and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
Screening (average risk, age 45-75)
- For my situation (screening (average risk, age 45-75)), which of the standard options do you recommend and why?Why: Guideline options include: Colonoscopy every 10 years, annual FIT, multitarget stool DNA every 3 years, CT colonography, or the Shield blood test every 3 years; start at 45 (USPSTF 2021). Lynch carriers: colonoscopy every 1-2 years from age 20-25.
- Am I a candidate for Shield, and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
Stage I-II colon
- For my situation (stage i-ii colon), which of the standard options do you recommend and why?Why: Guideline options include: Surgical resection; observation for stage I and low-risk stage II. High-risk stage II (T4, obstruction, <12 nodes, LVI): consider 3-6 months fluoropyrimidine ± oxaliplatin; ctDNA-negative patients can safely omit (DYNAMIC). dMMR stage II derives no benefit from 5-FU alone.
- Am I a candidate for CAPOX (capecitabine, oxaliplatin), and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
- How do the results of DYNAMIC apply to someone like me?Why: Trial populations differ from individual patients; ask how closely you match.
Stage III colon, pMMR
- For my situation (stage iii colon, pmmr), which of the standard options do you recommend and why?Why: Guideline options include: Resection then adjuvant CAPOX for 3 months (T1-3 N1, low risk) or FOLFOX/CAPOX for 6 months (T4 or N2), per IDEA.
- Am I a candidate for FOLFOX (5-FU, leucovorin, oxaliplatin), CAPOX (capecitabine, oxaliplatin), and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
Stage III colon, dMMR
- For my situation (stage iii colon, dmmr), which of the standard options do you recommend and why?Why: Guideline options include: Resection then FOLFOX + atezolizumab for 12 months (ATOMIC, 3-year DFS 86% vs 77%). Neoadjuvant nivolumab + ipilimumab (NICHE-2) is an alternative under evaluation.
- Am I a candidate for Atezolizumab, FOLFOX (5-FU, leucovorin, oxaliplatin), and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
- How do the results of ATOMIC (Alliance A021502) and NICHE-2 apply to someone like me?Why: Trial populations differ from individual patients; ask how closely you match.
Locally advanced rectal, pMMR
- For my situation (locally advanced rectal, pmmr), which of the standard options do you recommend and why?Why: Guideline options include: Total neoadjuvant therapy: short-course radiation or long-course chemoradiation plus FOLFOX/CAPOX, then TME surgery or watch-and-wait for clinical complete response (OPRA). Non-operative management for select cCR.
- Am I a candidate for FOLFOX (5-FU, leucovorin, oxaliplatin), and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
Locally advanced rectal, dMMR
- For my situation (locally advanced rectal, dmmr), which of the standard options do you recommend and why?Why: Guideline options include: Dostarlimab monotherapy for 6 months with organ preservation (MSK cohort 100% cCR; AZUR-1 registrational, PDUFA February 2027). Chemoradiation and surgery reserved for non-responders.
- Am I a candidate for Dostarlimab, and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
- How do the results of AZUR-1 apply to someone like me?Why: Trial populations differ from individual patients; ask how closely you match.
Metastatic, dMMR/MSI-high, first line
- For my situation (metastatic, dmmr/msi-high, first line), which of the standard options do you recommend and why?Why: Guideline options include: Pembrolizumab (KEYNOTE-177) or nivolumab + ipilimumab (CheckMate 8HW, PFS 54 months); nivolumab monotherapy alternative. Chemotherapy reserved for IO-refractory disease.
- Am I a candidate for Pembrolizumab, Nivolumab, Ipilimumab, and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
- How do the results of KEYNOTE-177 and CheckMate 8HW apply to someone like me?Why: Trial populations differ from individual patients; ask how closely you match.
Metastatic, RAS/BRAF wild-type, left-sided
- For my situation (metastatic, ras/braf wild-type, left-sided), which of the standard options do you recommend and why?Why: Guideline options include: FOLFOX or FOLFIRI + panitumumab or cetuximab (PARADIGM OS 37.9 months); bevacizumab if anti-EGFR contraindicated. Maintenance fluoropyrimidine ± biologic after induction.
- Am I a candidate for Panitumumab, Cetuximab, FOLFOX (5-FU, leucovorin, oxaliplatin) or related drugs, and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
- How do the results of PARADIGM and CRYSTAL & FIRE-3 apply to someone like me?Why: Trial populations differ from individual patients; ask how closely you match.
Metastatic, RAS-mutant or right-sided (non-G12C)
- For my situation (metastatic, ras-mutant or right-sided (non-g12c)), which of the standard options do you recommend and why?Why: Guideline options include: FOLFOX, FOLFIRI, or FOLFOXIRI + bevacizumab; anti-EGFR contraindicated. KRAS G12D and other alleles: RAS(ON) inhibitors in trials.
- Am I a candidate for Bevacizumab, FOLFOX (5-FU, leucovorin, oxaliplatin), FOLFIRI (5-FU, leucovorin, irinotecan) or related drugs, and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
Metastatic, BRAF V600E
- For my situation (metastatic, braf v600e), which of the standard options do you recommend and why?Why: Guideline options include: First line: encorafenib + cetuximab + mFOLFOX6 or FOLFIRI (BREAKWATER, OS 30.3 vs 15.1 months). Later line: encorafenib + cetuximab (BEACON).
- Am I a candidate for Encorafenib, Cetuximab, FOLFOX (5-FU, leucovorin, oxaliplatin) or related drugs, and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
- How do the results of BREAKWATER apply to someone like me?Why: Trial populations differ from individual patients; ask how closely you match.
Metastatic, KRAS G12C
- For my situation (metastatic, kras g12c), which of the standard options do you recommend and why?Why: Guideline options include: Sotorasib + panitumumab (CodeBreaK 300) or adagrasib + cetuximab after chemotherapy; first-line trials ongoing.
- Am I a candidate for Sotorasib, Adagrasib, Panitumumab or related drugs, and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
- How do the results of CodeBreaK 300 apply to someone like me?Why: Trial populations differ from individual patients; ask how closely you match.
Metastatic, HER2-amplified, RAS wild-type
- For my situation (metastatic, her2-amplified, ras wild-type), which of the standard options do you recommend and why?Why: Guideline options include: Tucatinib + trastuzumab (MOUNTAINEER) or trastuzumab deruxtecan 5.4 mg/kg (DESTINY-CRC02) after chemotherapy; MOUNTAINEER-03 tests first-line use.
- Am I a candidate for Tucatinib, Trastuzumab, Trastuzumab deruxtecan, and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
- How do the results of MOUNTAINEER & MOUNTAINEER-03 and DESTINY-CRC02 apply to someone like me?Why: Trial populations differ from individual patients; ask how closely you match.
Metastatic, refractory (third line and beyond)
- For my situation (metastatic, refractory (third line and beyond)), which of the standard options do you recommend and why?Why: Guideline options include: Trifluridine/tipiracil + bevacizumab (SUNLIGHT, OS 10.8 months), then fruquintinib (FRESCO-2) or regorafenib; NTRK inhibitor if fusion; clinical trials.
- Am I a candidate for Trifluridine/tipiracil, Fruquintinib, Regorafenib or related drugs, and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
- How do the results of SUNLIGHT and FRESCO-2 apply to someone like me?Why: Trial populations differ from individual patients; ask how closely you match.
Oligometastatic liver or lung disease
- For my situation (oligometastatic liver or lung disease), which of the standard options do you recommend and why?Why: Guideline options include: Resection, thermal ablation, or SBRT with curative intent after multidisciplinary review; perioperative chemotherapy; 5-year survival 30-50% after complete resection of liver metastases.
Any stage
- Are there clinical trials I could join, for example of Daraxonrasib, Autogene cevumeran, Signatera, AZUR-1?Why: Trials are how the next standard of care is set; asking early keeps options open.
- Would a second opinion at a high-volume centre change anything, and can you help arrange it?Why: Rare or high-stakes decisions benefit from a centre that treats many similar patients.
- What supportive care (symptom control, nutrition, exercise, mental health, financial help) is available from the start?Why: Supportive care improves quality of life and helps patients complete treatment.
- I read that “MSS metastatic disease is immunotherapy-resistant”. How does that affect my plan?Why: Open problems are where trials and second opinions matter most.
- I read that “Early-onset CRC causes unknown”. How does that affect my plan?Why: Open problems are where trials and second opinions matter most.
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Direct links plus the targets, companies, and technologies of this cancer's products.
technologies
51targets
17drugs
38companies
34institutions
101pathways
7terms
19trials
20pairings
5roadmaps
1ideas
80collections
1people
41bottlenecks
15key papers
19Patients with newly diagnosed metastatic colorectal cancer whose tumour carries a BRAF V600E mutation, which is about 8-12% of cases, should now be offered encorafenib and cetuximab together with FOLFOX from the start rather than after chemotherapy fails; median survival has roughly doubled to about two and a half years. BRAF testing at diagnosis is therefore essential, alongside RAS and mismatch repair testing. The regimen is more toxic than chemotherapy alone.
For colon cancer survivors, a prescribed, supported exercise programme is now an evidence-based treatment with a survival benefit comparable to many drugs. Health systems will need to fund exercise consultants as they fund chemotherapy. The trial does not tell us whether unsupervised advice achieves the same.
For colon cancer that is mismatch-repair deficient (about 10-15% of colon cancers, more in older patients), a single short course of immunotherapy before surgery is now a reasonable standard and is far more effective than chemotherapy, which barely works in this subtype. It requires testing every colon cancer for mismatch repair at diagnosis, before surgery. Whether some patients can safely skip surgery, as in dMMR rectal cancer, is the next question.
NICHE-2 shows that a month of immunotherapy before surgery can effectively cure locally advanced dMMR colon cancer, where chemotherapy after surgery has limited benefit. It is changing guidelines towards neoadjuvant checkpoint blockade for this group and raises the question of whether surgery can be omitted altogether, as in dMMR rectal cancer. Whether the same applies to MMR-proficient tumours is being tested but is not established.
Patients with metastatic colorectal cancer carrying a KRAS G12C mutation (about 3-4% of cases) who have exhausted standard chemotherapy now have a targeted option that works far better than trifluridine-tipiracil or regorafenib. The higher sotorasib dose is clearly superior, and the EGFR antibody is essential because KRAS inhibition alone barely works in bowel cancer. Responses are still modest and short-lived compared with EGFR or ALK inhibitors in lung cancer.
The blood test stratifies risk far better than stage or pathology. It supports treating ctDNA-positive patients and suggests ctDNA-negative patients gain little from chemotherapy, but because treatment was not randomised the de-escalation claim needs the randomised trials that are now under way.
Cercek's dostarlimab study is the clearest demonstration that immunotherapy can replace surgery in a solid tumour: patients with dMMR rectal cancer can keep their rectum and avoid the permanent effects of pelvic radiotherapy and surgery. Non-operative management after PD-1 blockade is now in guidelines for this group, and MMR testing before treatment of rectal cancer is essential. The approach applies only to the 5-10% of rectal cancers that are dMMR.
Patients with rectal cancer whose tumour is mismatch-repair deficient (about 5-10% of rectal cancers) can now be offered immunotherapy alone with the realistic expectation of avoiding surgery, radiotherapy and a permanent stoma. This requires mismatch repair testing on the diagnostic biopsy, close endoscopic and MRI surveillance, and treatment in an experienced centre. It does not apply to the 90% of rectal cancers that are mismatch-repair proficient.
For stage II colon cancer, where most patients are cured by surgery alone, a blood test can identify the minority who benefit from chemotherapy and spare everyone else its side effects. It does not yet prove that treating ctDNA-positive patients improves survival compared with not treating them.
A colonoscopy probably does reduce bowel cancer risk for the person who has it, but a programme that offers colonoscopy achieves much less if most people decline. Programmes based on stool tests with high uptake may deliver as much population benefit at lower cost and risk.
There is no safe level of alcohol for cancer risk, and the risk is highest for cancers of the mouth, throat, oesophagus, liver, bowel and breast. Public awareness is low; most people do not know alcohol causes breast cancer. Warning labels and minimum pricing are the policy levers being debated.
People with Lynch syndrome should be offered daily aspirin, which roughly halves bowel cancer risk with a delayed and durable effect. Whether a lower dose (as tested in CAPP3) is as effective, and whether the finding extends to the general population, are separate questions.
Because Lynch syndrome tumours make the same abnormal proteins in almost every patient, a single vaccine could in principle be given to carriers before cancer develops. This small trial showed the concept is safe and immunogenic; whether it prevents cancer requires the randomised trials now being planned.
Every colorectal cancer should be tested for mismatch repair deficiency, because patients whose metastatic tumour is dMMR should receive pembrolizumab rather than chemotherapy as first treatment, gaining a much better chance of durable remission with fewer side effects. About a third of dMMR tumours do not respond initially, so early scans are essential and chemotherapy remains available. The trial does not apply to the 95% of colorectal cancers that are mismatch-repair proficient.
This paper established a new regulatory paradigm: a drug approved for a molecular feature regardless of organ. It made MSI/MMR testing standard across advanced cancers and remains the clearest example of a biomarker that works across histologies. It also anchored the idea that mutation load, via neoantigens, is what makes tumours visible to T cells.
Maintaining a healthy weight is now established cancer prevention for over a dozen cancer types. For clinicians and policymakers, obesity belongs alongside tobacco and alcohol in prevention strategy. Whether intentional weight loss in adulthood reverses risk is still being studied, including in trials of GLP-1 drugs.
This small trial explained why colorectal cancer had seemed immune-resistant (most is MMR-proficient) and established the principle that a genomic feature, not the tissue of origin, can predict immunotherapy response. It led directly to the 2017 tissue-agnostic approval of pembrolizumab and to routine MMR/MSI testing of many cancers. Every patient with advanced dMMR cancer should now be considered for checkpoint blockade.
The most frequently mutated oncogene in cancer stopped being undruggable, and patients with KRAS G12C lung and bowel cancers now have targeted pills. The approach, exploiting a mutation-created chemical handle and an inactive-state pocket, has become a template for other hard targets.
A cheap home stool test, repeated yearly or every two years and followed by colonoscopy when positive, prevents bowel cancer deaths. This is what national bowel screening programmes do today, with FIT replacing the older guaiac test.
Latest papers
topQuery for this cancer: (TITLE:"Colorectal cancer" OR ABSTRACT:"Colorectal cancer") AND (treatment OR therapy OR trial OR survival OR diagnosis). Results are unfiltered search hits about Colorectal cancer, not a curated reading list.