EvidenceColorectal cancer

For someone offered the test, these are the numbers that describe what a result means in an NHS population: about 1 in 100 tests came back positive each year, between 46 and 58 in 100 positives were cancer, and a negative result left about 1 in 100 with an undetected cancer within the year. The test found between a quarter and a third of all cancers diagnosed in a screening round, and about half to two thirds of the 12 cancer types it was designed to find. Whether finding them this way reduces late-stage diagnoses is the primary question, and this paper says only that the answer was no; the primary-endpoint paper had not appeared on Europe PMC by 23 September 2026.

Patients 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.

This is the validation study behind the July 2026 FDA approval of SimpleScreen CRC. For someone who will not take a stool test or colonoscopy it offers a real option for catching cancer, but because it misses most advanced polyps it prevents fewer cancers than the established tests, and a positive result still needs a colonoscopy.

This is the number behind almost every statement about how much cancer there is. It shows the burden shifting towards low- and middle-income countries and towards older populations, which is why prevention, screening and affordable treatment in those settings decide the global trend. OnCo's country and prevalence pages draw on the same GLOBOCAN release.

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.

This series is the standard reference for US cancer numbers and the source of most headlines about cancer in younger adults. The gap between falling mortality and rising incidence is the argument for both continued treatment advances and stronger prevention and screening.

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.

The only completed efficacy study of an internet-famous dewormer in cancer patients found no benefit in anyone. It is the clearest human result in this whole story.

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.

This report marked the shift of the global cancer burden towards breast cancer and towards lower-income countries, and it is the baseline most 2020s policy documents cite. The GLOBOCAN 2022 release has since updated the totals.

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.

CONCORD is the evidence base for national cancer plans and for the statement that where you live changes your chance of surviving cancer. Its country tables are the benchmark health systems use to judge early diagnosis and treatment access.

This was the most cited description of the global cancer burden until the 2020 release and is the reference behind many national cancer plans of the late 2010s. Its country-level comparisons showed where prevention, such as HPV and hepatitis B vaccination and tobacco control, would have the largest effect.

Complementary approaches used alongside treatment are one thing; substituting an alternative therapy for surgery, chemotherapy, radiotherapy or hormone therapy in a curable cancer is associated with a large increase in the risk of dying. The finding is the evidence base for offering complementary therapies inside cancer centres and for asking every patient, without judgement, what else they are using.

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.

China accounts for roughly a quarter of the world's cancer cases, and this paper is the reference that made its burden legible internationally. It explains why Chinese trial programmes and drug pipelines concentrate on lung, stomach, oesophageal and liver cancers.

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.

This paper reframed pancreatic and liver cancer as the coming burden and is cited in most arguments for investing in them. Its pancreatic cancer projection has been tracking close to reality in the years since.

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.

Organoids from patients' tumours are now used to test drugs before treatment, to model rare cancers and to study resistance. Every one of those systems descends from this culture method.

This paper showed that the immune response to a cancer is part of its prognosis, not background noise, and it introduced the idea of the immune contexture that underlies both the Immunoscore and the biomarker work in immunotherapy.

The first of the modern GLOBOCAN summaries in CA, it set the template that Jemal, Torre, Bray and Sung later followed and provides the 2002 baseline for tracking how the global burden has grown and shifted.

This trial opened anti-angiogenic therapy as a class, and bevacizumab went on to approvals in lung, kidney, ovarian, cervical and brain cancers. It also set the pattern of modest but real survival gains from adding a biologic to chemotherapy, and introduced hypertension, proteinuria and perforation as the signature side effects clinicians now monitor.

This trial made preoperative chemoradiotherapy the standard for locally advanced rectal cancer worldwide and is the foundation on which total neoadjuvant therapy and watch-and-wait organ preservation were later built.

This is the study most often cited for the size of the obesity and cancer link, and it broadened the list of weight-related cancers well beyond the few known before. It underlies weight management advice in cancer prevention guidance and the current interest in whether GLP-1 drugs change cancer risk.

This paper is why the tumour microenvironment is studied as intensely as the cancer cell itself. It underpins vaccination against HPV and hepatitis B as cancer prevention, aspirin and anti-inflammatory trials in bowel cancer, and the current work on macrophages and myeloid cells as immunotherapy 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.

This paper is why TP53 status is reported in almost every tumour genome and why mutational signatures can point to causes. Its idea that mutation patterns record exposures grew into the mutational signature field, and TP53 mutation remains a marker of poor prognosis and a drug target still being pursued.