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The world’s largest randomised trial of a multi‑cancer early detection (MCED) blood test, involving 142,942 NHS participants, did not achieve its main aim of cutting late‑stage cancer diagnoses, according to data presented at the ASCO annual meeting in Chicago.Trial Overview and Primary ObjectiveThe study enrolled adults aged 50‑77 with no cancer symptoms, assigning half to annual Galleri testing alongside standard screening and the other half to standard screening alone. Positive Galleri results triggered diagnostic follow‑up, mirroring the protocol for symptomatic participants in both arms.Key Findings and Statistical OutcomesParticipants: 142,942 screened over three years.Primary endpoint: Combined stage III and IV diagnoses across 12 pre‑specified cancers.Result: No statistically significant reduction in advanced‑stage cancers in the Galleri arm versus control.Secondary signal: Stage IV cancers fell by 14% in the Galleri group, a finding the company Grail highlighted as encouraging.Dr Julie Gralow, ASCO’s chief medical officer, noted the trial showed “some encouraging trends toward tumour downstaging” but emphasized the primary endpoint was not met.Implications for NHS Cancer Screening StrategyExperts such as Prof Richard Houlston (Institute of Cancer Research) warned that the lack of a primary‑endpoint hit undermines any justification for nationwide adoption of Galleri. Prof Peter Johnson, NHS England’s national clinical director for cancer, said the NHS will scrutinise the full data before deciding on future implementation.The trial’s outcome raises questions about the cost‑effectiveness of MCED tests at population scale and may temper enthusiasm for rapid integration into existing screening programmes.Future Directions and Remaining QuestionsMortality outcomes, expected in the next few years, will be critical to assess whether earlier detection translates into survival benefits. Researchers and policymakers will likely await these results before committing to broader rollout, while Grail may refine its assay based on the secondary findings.

The LeadMost men in the UK will not be offered prostate cancer screening if the government accepts the final recommendation of an expert committee. The UK National Screening Committee (UKNSC) has concluded that widespread screening using the prostate-specific antigen (PSA) test was "likely to cause more harm than good" despite prostate cancer being the most common cancer in the UK.The Recommendation DetailsThe committee recommended screening only for men with the BRCA2 gene variant who have a family history of certain cancers, suggesting they be screened every two years between the ages of 45 and 61. For this specific group, prostate cancer is more common, develops earlier, and can be more aggressive. Of 100 men with a BRCA2 variant, between 21 and 35 will develop prostate cancer before the age of 80.The committee recommended against screening for other at-risk groups, including black men, citing "ongoing uncertainty on whether screening would cause more good than harm." The main harms of population screening include incontinence and erectile dysfunction in men who do not need treatment for the disease.The Prevalence DataProstate cancer is the most common cancer in the UK, with more than 64,000 men diagnosed every year. However, there is currently no national screening programme for the disease. The UKNSC estimates that its final recommendation would lead to "a few thousand" men being screened for prostate cancer each year.Only around one in every 300 to 400 people will have BRCA gene variations, though as many as one in every 40 Ashkenazi Jewish people carry these variations. In England, the NHS offers free BRCA gene testing for anyone aged 18 or over who has at least one Jewish grandparent.The Impact AnalysisThe decision will come as a blow to campaigners who have voiced support for more widespread screening, including high-profile figures like Sir Chris Hoy, David Cameron, and Sir Stephen Fry. Prostate Cancer UK expressed being "deeply disappointed" with the recommendation, stating that without a screening programme for the UK's most common cancer, "we lose more than 12,000 dads, brothers and partners every single year."However, medical experts argue that screening can reduce deaths from prostate cancer only to a small extent and does not improve overall survival. The challenge remains that once a prostate cancer is found, doctors still can't reliably tell which cancers need treatment and which do not, and treatments can cause long-lasting harm.The Future OutlookThe government will now consider the recommendation, with the new Health Secretary James Murray set to meet with the UKNSC chair. The Department of Health and Social Care stated that Murray "will give full and careful consideration to the recommendation" and would update on the government's response shortly.The committee acknowledged that more research is needed to address evidence gaps, particularly regarding black men. The UKNSC will work with the Transform trial, launched by Prostate Cancer UK, to gather more data. It was noted as "particularly important" that a "sufficient number" of black men be invited to participate in this trial.

Screening men for prostate cancer with a PSA blood test can save lives, yet the overall gain is limited and comes with a risk of overdiagnosis and unnecessary treatment, according to the most comprehensive review to date.Study Confirms PSA Screening Reduces MortalityThe Cochrane review, led by Dr Juan Franco of Heinrich Heine University, analysed six randomized trials covering nearly 800,000 men. The longest follow‑up came from the European Randomized Study of Screening for Prostate Cancer (ERSPC), which tracked participants for 23 years.Numbers Reveal Modest Absolute BenefitScreening prevented 2 prostate‑cancer deaths per 1,000 men screened.To avert a single death, 500 men must be screened.For every 1,000 men screened, roughly 30 additional men were diagnosed with cancers that might never have caused symptoms.Post‑treatment side‑effects (urinary or sexual dysfunction) were reported by 8‑47 % of men in the ProtecT trial.Balancing Life‑Saving Potential Against Overdiagnosis RisksProstate cancer is common—over 64,000 new cases are diagnosed annually in the UK, with higher incidence among Black men. While the UK National Screening Committee currently advises against routine PSA screening, it recommends targeted testing for men with BRCA1/BRCA2 mutations. Experts such as Prof Philipp Dahm stress that screening is most sensible for men with a life expectancy of at least 10‑15 years, given the disease’s often slow progression.Critics point out that many detected tumours are low‑risk, leading to treatments that can cause incontinence and impotence. The review highlights emerging strategies—multi‑protein blood markers, MRI‑guided pathways, and active surveillance—that aim to improve specificity, though their impact on mortality remains unproven.Future Direction: Precision Screening and Policy DecisionsResearchers call for further trials to close evidence gaps and to evaluate whether newer biomarker panels and imaging can preserve the mortality benefit while reducing harms. Policymakers face a nuanced choice: maintain a cautious, risk‑based screening framework or expand programmes as diagnostic technologies mature.In the interim, clinicians are urged to engage in shared decision‑making, ensuring men receive balanced information about both the potential life‑saving advantage and the possible long‑term side‑effects of treatment.