Facade of Stoke Mandeville Hospital in the UK
Seb, 11, starts secondary school in remission after beating rare blood cancer diagnosed at Stoke Mandeville Hospital when he was three Des Blenkinsopp/Wikimedia Commons

An 11-year-old boy from Hertfordshire has started secondary school in remission after surviving a rare, fast-growing blood cancer and undergoing more than 2,000 medical procedures.

Seb Boulter, from Tring, was diagnosed with lymphoblastic lymphoma when he was three. Over the next three years, he underwent chemotherapy, 10 blood transfusions and more than 1,200 days of treatment before being given the all-clear in June 2022.

Starting secondary school is a milestone his family once feared he might never reach. His family is now sharing his story as part of Blood Cancer UK's 'Here for This' campaign, which highlights the birthdays, school days and family moments young cancer patients can lose during treatment.

Claire Boulter first realised something was seriously wrong when she noticed a prominent vein running from Seb's neck to his groin.

She took him to A&E, where doctors at Stoke Mandeville Hospital discovered an 11cm tumour in his chest. Tests confirmed lymphoblastic lymphoma. Treatment began with steroids and chemotherapy followed on Seb's fourth birthday.

Fourth Birthday Spent on a Drip

Seb spent his fourth birthday attached to a chemotherapy drip in hospital and managed only a small amount of chocolate cake. His first day of primary school was also cut short. He wore his uniform for an hour before returning to hospital for further treatment.

Over the next 1,200 days, Seb lost his hair and suffered sickness, mouth ulcers, brain fog and depression. Steroids caused severe swelling, at times leaving him unable to walk and dependent on a wheelchair.

When treatment ended, he needed physiotherapy to rebuild strength in his legs. He also made three emergency ambulance journeys.

Childhood Put on Hold

The cancer brought another danger: infection. With his immune system compromised, Seb spent much of his treatment isolated from other children.

Playdates were cancelled. Football stopped. Family holidays disappeared for three consecutive years.

Seb had suffered repeated infections, extreme tiredness, weight loss and a pale complexion, all recognised symptoms of lymphoblastic lymphoma.

For his family, life became organised around hospital visits, treatment and the constant risk of illness.

Festival Raises £6,000 for Research

When Seb was finally declared cancer-free, his family organised 'Seb Fest', a fundraising festival that raised £6,000 for Blood Cancer UK and other charities. Since then, Seb has begun making up for some of what treatment interrupted. He has visited Legoland and Disneyland Paris, made close friends, done well academically and taken up football.

Secondary school carries particular significance. For most families, it is an ordinary September milestone. For Seb's family, it is something they once could not take for granted. Seb's mother Claire said it 'means everything'.

Lymphoblastic Lymphoma in UK Children

Lymphoblastic lymphoma is a rare, fast-growing blood cancer affecting immature lymphocytes. It affects around 400 children in the UK each year and accounts for roughly 20 per cent of childhood non-Hodgkin lymphomas.

The disease is classed as lymphoma rather than leukaemia when fewer than 25 per cent of bone marrow cells are affected by cancer. T-cell lymphoblastic lymphoma is the most common form, accounting for around 90 per cent of lymphoblastic lymphoma cases.

Because the disease is rare, doctors largely use chemotherapy treatments developed for acute lymphoblastic leukaemia. Survival rates have improved, with one study finding that 87 per cent of children were alive five years after treatment and 90 per cent remained free of the disease.

New diagnostic technologies, including next-generation sequencing, can also detect extremely small numbers of cancer cells. This can help doctors identify children at greater risk of relapse and tailor treatment more precisely.

Blood Cancer UK's 'Here for This' campaign focuses on the everyday moments cancer can take away from children and their families. Direct donations to Blood Cancer UK also support research into treatments designed to be more effective and less toxic.