Pregnancy
Planned C-sections linked to leukaemia risk in children
Children born by planned caesarean section may face a 21 per cent higher risk of developing acute lymphoblastic leukaemia (ALL) later in life, new research has found.
The risk was even higher for B-cell acute lymphoblastic leukaemia (B-ALL) – the most common form of childhood blood cancer – with a 29 per cent increased risk compared to children born vaginally. The elevated risk appeared more pronounced in boys and in younger children.
Despite the findings, researchers stressed that childhood leukaemia remains rare. In Sweden, between 50 and 70 children are diagnosed with B-ALL each year. The excess risk associated with planned C-sections corresponds to approximately one additional case annually.
The study, led by researchers at Karolinska Institutet, examined data from nearly 2.5 million children born in Sweden between 1982 and 1989, and from 1999 to 2015. Of these, around 15.5 per cent – approximately 376,000 children – were delivered by caesarean section. In the entire cohort, 1,495 children were later diagnosed with leukaemia.
ALL is a cancer of the blood that affects white blood cells. B-ALL specifically affects B-lymphocytes, a type of immune cell that plays a role in fighting infection.
Using the Medical Birth Register, researchers were able to distinguish between planned and emergency caesarean sections. The increased risk was observed only among those born by planned C-section. The association remained even after adjusting for other relevant factors in mothers and children.
Christina-Evmorfia Kampitsi, researcher at the Institute of Environmental Medicine at Karolinska Institutet and lead author of the study, said: “C-sections are an important and often life-saving part of obstetric care. We don’t want mothers to feel anxious about medically indicated C-sections. But when this result is combined with other study results showing that the risk of later asthma, allergies or type 1 diabetes increases in children born by planned C-section, there is reason to discuss C-sections that are not medically indicated.
Researchers suggest the difference in risk between planned and emergency C-sections may be related to how the baby is exposed to stress and bacteria at birth. Emergency caesareans often begin as vaginal deliveries, meaning the baby may experience birth-related stress and be exposed to vaginal bacteria if the amniotic sac has ruptured.
In contrast, planned C-sections are typically performed before labour starts, reducing exposure to maternal bacteria and stress, which may affect immune system development and help explain the increased risk.
Some results did not reach the threshold for statistical significance, meaning chance cannot be entirely ruled out. Kampitsi said: “Fortunately, ALL is rare. This means that many C-deliveries are needed to obtain a statistically significant result, and it is difficult to obtain such a large sample in a Swedish registry study. However, the results are close to significant, are in line with what previous studies have shown, and remain when we adjust for other relevant factors, which still makes them relevant.”
The findings may help improve understanding of the causes of childhood leukaemia and add to growing evidence of associations between planned C-sections and immune-related conditions.
The research was funded by the Swedish Research Council and the Swedish Cancer Society. The researchers reported no conflicts of interest.
Pregnant women are among the first groups offered the NHS flu vaccine this winter, which has been updated to better match the subclade K strain.
Schoolchildren are also being prioritised and, like pregnant women, can receive the vaccine from September because they can catch and spread flu easily.
Protecting them also helps others, including younger siblings and grandparents.
Other eligible groups, including people aged 65 and over, will be able to receive a free NHS flu vaccine from October and should receive an invitation by phone or post.
Dr Amanda Doyle from NHS England said: “Last year’s flu season came early and was made worse by a new variant, which had a major impact for patients and put enormous pressure on urgent and emergency care services across the country.
“With the NHS experiencing its busiest summer on record, staff have started preparing for this winter earlier than ever – and with services already under significant pressure, it is vital that everyone offered the vaccine comes forward.”
Last winter’s flu season began more than a month earlier than usual as a new mutated strain circulated.
The strain was sometimes referred to as “Super flu”, although this is not a medical term and does not mean the virus is harder to treat. The name reflected that people had yet to build up immunity against it.
Flu vaccines are updated each year to better match the influenza viruses expected to circulate. These viruses continually mutate, so experts must predict how they are likely to change.
This winter’s vaccine includes changes intended to provide a better match for subclade K.
It remains unclear when flu will begin circulating widely this winter or how severe the season will be. Experts often look at flu activity in southern hemisphere countries such as Australia and New Zealand for indications of how the UK season could develop.
Their flu season peaks in July or August. Australia has recorded fewer cases than last year, while New Zealand has experienced high numbers.
Everyone is at risk of catching flu, regardless of age or how fit and healthy they are.
Doyle said: “Flu can really knock you for six, and for some children and pregnant women it can mean becoming seriously ill or ending up in hospital.”
The flu vaccine cannot give you flu. Instead, it helps the body know how to fight the virus.
Children aged two and over receive a nasal spray version, while adults receive an injection. One dose is needed ahead of winter.
Free NHS flu vaccines are available through pharmacies, GPs and schools. People who are not eligible for a free vaccination can pay around £10 to £20.
Schoolchildren and pregnant women can receive a free NHS flu vaccine from September onwards.
From October, free vaccination will also be available to children aged two or older who have not yet started school, people aged 65 and over, those with certain long-term health conditions, care home residents and carers of older or disabled people, including those receiving a carer’s allowance.
It will also be available to people living with someone who has a weakened immune system and those experiencing homelessness or staying in a homeless hostel or night shelter.
More adults will also be offered vaccination against respiratory syncytial virus (RSV), a virus that attacks the lungs, this winter.
From September, adults with certain pre-existing health conditions, such as chronic lung disease, will be invited for the RSV vaccine when they turn 65 rather than waiting until 75.
Four leading cardiovascular health groups have agreed new guidance for healthcare professionals assessing patients with suspected heart attacks.
Historically, some less common forms of heart attack, which evidence shows affect women far more than men, have been classified as less important, with treatment and care often worse as a result.
Experts said women had been receiving less effective treatments that did not always target the specific cause of their heart attack and could even make them more unwell.
The changes were announced in Munich on the opening day of the annual congress of the European Society of Cardiology (ESC).
Professor Bryan Williams, chief scientific and medical officer of the British Heart Foundation, said: “This is a landmark moment, a radical shift in how we define and diagnose heart attacks worldwide which will transform people’s care.
“For decades, women have missed out on accurate diagnoses and treatment.
“This focus on finding less common causes of heart attacks, which predominantly affect women, should help to change that. It could be life-changing for huge numbers of women in the UK and worldwide.”
The new guidance upgrades three types of heart attack that can be up to 10 times more common in women and are often caused by childbirth, exercise and emotional stress.
The most serious cases, previously known as “type 1” and now classed as “primary” heart attacks, had previously prioritised those caused by a clot blocking blood flow to the heart.
Other forms can involve reduced blood flow for different reasons, including the tightening or tearing of coronary arteries. These can be more likely to be missed or treated less urgently.
The guidance also introduces a lower diagnostic threshold for women based on levels of troponin, a protein released into the blood when the heart is injured and damaged.
Previously, women were expected to meet the same troponin threshold as men to receive a diagnosis.
Williams said the streamlined heart attack categories would also help patients understand the cause of their heart attack and what comes next.
The three upgraded types are coronary artery spasm, coronary embolism and spontaneous coronary artery dissection (SCAD).
Coronary artery spasm involves the tightening of an artery, which can deprive the heart muscle of blood and oxygen. It can be caused by emotional stress, exercise or extreme cold.
Coronary embolism occurs when a blood clot or fatty deposit travels to a coronary artery and causes a blockage.
SCAD is caused by a tear in a coronary artery. Around 80 per cent of cases occur in women, and it often happens during or soon after pregnancy.
Professor Nicholas Mills, a cardiologist at the University of Edinburgh who led the international taskforce behind the guidance, said it was “the first time that we’ve had a truly global approach to aligning how we diagnose what is probably the most important diagnosis there is”.
He said: “It kills so many people, and we’ve never got everyone together around the world to agree how we’re going to describe it, classify it, explain it to our patients.
“Our job now is to implement this as widely as possible. It’s just as relevant for the UK as it is for any other country around the world. It is a revolution. It’s going to make care better for patients.”
Mills said there had been “unintended systematic bias against women”, including through the use of the key blood test for diagnosing heart attacks at an average level, which picks up all men but misses some women.
He said: “This is used for all types of heart attack in every emergency department in the world, and we want to make sure that it’s used correctly.”
The guidance was drawn up by the ESC, the American College of Cardiology, the American Heart Association and the World Heart Federation.
KOVE Medical has raised €1.7 million to support first-in-human studies of an implantable device designed to reduce preterm birth risk after foetal surgery.
The University of Zurich spin-off is developing a device designed to close defects left by surgical instruments following fetoscopy, a minimally invasive procedure performed inside the womb.
Fetoscopies can treat life-threatening conditions before birth but require surgical instruments to pass through the uterine wall and amniotic sac.
This can weaken the protective membrane, causing fluid leakage or rupture and often leading to preterm birth.
KOVE Medical said in a statement on LinkedIn: “This is a crucial step forward for our company, and we are incredibly grateful for the strong support and trust from our syndicate of visionary angel investors.”
KOVE Medical says its device closes the defect at the end of the procedure, stabilising the membrane and preventing complications. The aim is to make in-utero interventions safe enough to become a standard method of care.
The company plans to use the seed funding to reach first-in-human studies, a key milestone for a medical device seeking regulatory approval.
The CHF1.6m round was backed by a syndicate of angel investors.
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