Leoś is only 5 months old❗Juvenile myelomonocytic leukemia❗

Highlights

  • Diagnosis
    Juvenile myelomonocytic leukemia
  • Age of the Ward
    6 months
  • Location
  • Mentee
    Leon Karolczak

Update

Genetic test results
The results of the genetic testing came back at the end of February. An NRAS mutation was detected. Next Leosia underwent a test to measure her fetal hemoglobin level. The result was 5.2, which is an indication for a bone marrow transplant.
URGENT: Looking for a donor
Unfortunately, none of Leosia's immediate family members are eligible to be bone marrow donors due to a lack of full compliance. Currently The search for an unrelated donor is ongoing. We kindly ask for your support and for you to register with the bone marrow donor registry. This is currently the most important step that can help save Leosia’s life.
Hospital stay and treatment of the infection
Starting March 27 Leo is staying at Cape of Hope. In addition to his underlying condition, he has developed an infection and ear infections. The situation was serious because the fungal infection could have spread and affected the brain. Fortunately, the MRI scan ruled out such a complication. Cancer treatment was suspended while the infection was being treated.
The next stage of treatment
On April 15, 2026, Leosi underwent a Broviac catheter placement. Now all hope rests on finding a donor. The next steps in his treatment depend on this. April 16, 2026

Explore the history of

It all started with a runny nose.

At the end of January , Leosia developed a runny nose and symptoms of an upper respiratory tract infection. For the parents of a few-month-old baby, this was one of those moments that often occur in the first months of life and usually pass without major consequences.
However, out of concern for their son, they went to the hospital in Trzebnica, hoping for routine treatment and a quick return home.

An IV drip was administered and basic blood tests were performed. It was the results of the complete blood count that made it necessary to expand the diagnostics.
The blood parameters indicated very high leukocytosis, which did not decrease in subsequent follow-up tests. A repeated complete blood count with smear revealed the presence of blasts in the peripheral blood.

The doctors decided to urgently refer the boy to a specialist pediatric oncology center.

Leon Karolczak - fundraiser for medical treatment

The hospital in Wrocław and further tests

Leoś was transported by medical transport to the "Przylądek Nadziei" Children's Oncology Center in Wrocław. Detailed diagnostics were immediately initiated, while simultaneously treating the infection that accompanied his hospitalization.

The boy was diagnosed with atypical pneumonia and started on antibiotic therapy. In the following days, his hemoglobin level began to drop rapidly, requiring a blood transfusion.

The series of tests took on a pace that was difficult for the parents to cope with. A puncture and abdominal ultrasound revealed an enlarged spleen. The doctors already knew that further answers were needed.

The bone marrow test results provided an answer.

At the beginning of February , bone marrow was collected for detailed analysis. This test was intended to resolve the doubts that had already arisen with the initial blood test results.

The parents waited for the results, hoping that the doctors' fears would not be confirmed. Each day of waiting seemed longer than the last, because everything that was to happen next depended on this answer.

In early March, doctors confirmed the diagnosis: juvenile myelomonocytic leukemia.

This is a rare and challenging type of childhood leukemia. With such a young patient, every treatment decision must be made with extreme caution. Leoś is currently receiving oral chemotherapy. Further tests are underway to determine whether more aggressive treatment, including a bone marrow transplant, will be necessary.

The family between home and hospital

Illness does not take age into account. It does not pause for a moment to allow parents to enjoy the first months of their child's life. Leoś is only five months old. Instead of peaceful mornings and first smiles, there is a hospital bed, tests, and constant vigilance.

The boy's mother is on maternity leave. However, she is not spending this time at home, but at her son's small hospital bed, watching the medical procedures and trying to stay calm when Leoś cries from exhaustion and pain.

At home, his 4.5-year-old brother Kajtek is waiting. For him, the world has also suddenly changed. His mother has disappeared from his everyday life, as has his younger brother, who had only just arrived in their home.
Dad is trying to maintain balance in this new reality. Work, caring for Kajtek, commuting to the hospital, supporting his wife. In such a situation, it is difficult to find a moment to breathe.

Treatment of a young patient

Leosia's parents are facing a time of uncertainty. They already know how serious their son's illness is, but they still don't know the whole path that lies ahead of them. The latest test results will show what treatment will be necessary to give Leosia a chance at health.

Every gesture of kindness gives them the strength to believe that this story may unfold differently than fear suggests today, and that Leosia's future remains a story that is yet to be written.

Promote collection

Download the prepared graphics and share them on social media. Encourage your friends to support and share. Put up a poster in your workplace, school, store. Every piece of information increases the chance of winning the Wards!

Every zloty and every share makes a huge difference. Help reach as many people as possible and increase the chances of this collection. Tell your friends, family and community - together we can do more!

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Threads

Donate 1,5% tax

Your e-PIT is the easiest way to settle your taxes. The IRS pre-fills your tax returns, and you can verify, approve or correct them.

  • Step 1 - log in to the e-Tax Office and use the e-PIT service.
  • Step 2 - in the PIT return form, click on Select an organization.
  • Step 3 - in the list of organizations, search for Cancer Fighters Foundation or enter the KRS number 0000581036.
  • Step 4 - in the field with the specific goal of 1.5%, indicate the Ward by entering the following data:
  • KRS No.
    0000581036
  • Specific objective
    Leon Karolczak

Contributions and words of support

Anonymous
April 21, 2026
20.00 00zł
Anonymous
April 20, 2026
PLN 50.00
Anonymous
April 20, 2026
PLN 200.00
Anonymous
April 20, 2026
20.00 00zł
Anonymous
April 20, 2026
PLN 50.00
Anonymous
April 20, 2026
PLN 200.00
Christopher
05/03/2026
Good health for your little one and strength for your whole family!
PLN 1,700.00
School Complex in Dłoni
March 11, 2026
We send lots of strength, hope, and support to Leon and his parents.
PLN 1,342.00
Cancer Fighters
04/03/2026
PLN 1,000.00
Monika
March 6, 2026
PLN 1,000.00
Patricia
March 6, 2026
PLN 1,000.00
Agata and Krzysztof
March 16, 2026
Cheers :-)
PLN 1,000.00
43,441.00 PLN(62%)
Still need - 26,559 PLN
The collection was supported by: 508 people
  • Purpose of the collection
    Medication, psychological support for the family, ongoing treatment costs

Promote the collection

Download and share materials

Donate 1.5% of your tax

The Foundation's beneficiaries

Download QR code

Moneybox at hand

Leoś is only 5 months old❗Juvenile myelomonocytic leukemia❗

43,441.00 PLN(62%)
Still need - 26,559 PLN
The collection was supported by: 508 people
  • Purpose of the collection
    Medication, psychological support for the family, ongoing treatment costs

Highlights

Collection target and updates

Genetic test results
The results of the genetic testing came back at the end of February. An NRAS mutation was detected. Next Leosia underwent a test to measure her fetal hemoglobin level. The result was 5.2, which is an indication for a bone marrow transplant.
URGENT: Looking for a donor
Unfortunately, none of Leosia's immediate family members are eligible to be bone marrow donors due to a lack of full compliance. Currently The search for an unrelated donor is ongoing. We kindly ask for your support and for you to register with the bone marrow donor registry. This is currently the most important step that can help save Leosia’s life.
Hospital stay and treatment of the infection
Starting March 27 Leo is staying at Cape of Hope. In addition to his underlying condition, he has developed an infection and ear infections. The situation was serious because the fungal infection could have spread and affected the brain. Fortunately, the MRI scan ruled out such a complication. Cancer treatment was suspended while the infection was being treated.
The next stage of treatment
On April 15, 2026, Leosi underwent a Broviac catheter placement. Now all hope rests on finding a donor. The next steps in his treatment depend on this. April 16, 2026

Explore the history of

It all started with a runny nose.

At the end of January , Leosia developed a runny nose and symptoms of an upper respiratory tract infection. For the parents of a few-month-old baby, this was one of those moments that often occur in the first months of life and usually pass without major consequences.
However, out of concern for their son, they went to the hospital in Trzebnica, hoping for routine treatment and a quick return home.

An IV drip was administered and basic blood tests were performed. It was the results of the complete blood count that made it necessary to expand the diagnostics.
The blood parameters indicated very high leukocytosis, which did not decrease in subsequent follow-up tests. A repeated complete blood count with smear revealed the presence of blasts in the peripheral blood.

The doctors decided to urgently refer the boy to a specialist pediatric oncology center.

Leon Karolczak - fundraiser for medical treatment

The hospital in Wrocław and further tests

Leoś was transported by medical transport to the "Przylądek Nadziei" Children's Oncology Center in Wrocław. Detailed diagnostics were immediately initiated, while simultaneously treating the infection that accompanied his hospitalization.

The boy was diagnosed with atypical pneumonia and started on antibiotic therapy. In the following days, his hemoglobin level began to drop rapidly, requiring a blood transfusion.

The series of tests took on a pace that was difficult for the parents to cope with. A puncture and abdominal ultrasound revealed an enlarged spleen. The doctors already knew that further answers were needed.

The bone marrow test results provided an answer.

At the beginning of February , bone marrow was collected for detailed analysis. This test was intended to resolve the doubts that had already arisen with the initial blood test results.

The parents waited for the results, hoping that the doctors' fears would not be confirmed. Each day of waiting seemed longer than the last, because everything that was to happen next depended on this answer.

In early March, doctors confirmed the diagnosis: juvenile myelomonocytic leukemia.

This is a rare and challenging type of childhood leukemia. With such a young patient, every treatment decision must be made with extreme caution. Leoś is currently receiving oral chemotherapy. Further tests are underway to determine whether more aggressive treatment, including a bone marrow transplant, will be necessary.

The family between home and hospital

Illness does not take age into account. It does not pause for a moment to allow parents to enjoy the first months of their child's life. Leoś is only five months old. Instead of peaceful mornings and first smiles, there is a hospital bed, tests, and constant vigilance.

The boy's mother is on maternity leave. However, she is not spending this time at home, but at her son's small hospital bed, watching the medical procedures and trying to stay calm when Leoś cries from exhaustion and pain.

At home, his 4.5-year-old brother Kajtek is waiting. For him, the world has also suddenly changed. His mother has disappeared from his everyday life, as has his younger brother, who had only just arrived in their home.
Dad is trying to maintain balance in this new reality. Work, caring for Kajtek, commuting to the hospital, supporting his wife. In such a situation, it is difficult to find a moment to breathe.

Treatment of a young patient

Leosia's parents are facing a time of uncertainty. They already know how serious their son's illness is, but they still don't know the whole path that lies ahead of them. The latest test results will show what treatment will be necessary to give Leosia a chance at health.

Every gesture of kindness gives them the strength to believe that this story may unfold differently than fear suggests today, and that Leosia's future remains a story that is yet to be written.

Donate 1.5% of your tax

Your e-PIT is the easiest way to settle your taxes. The IRS pre-fills your tax returns, and you can verify, approve or correct them.

Step 1

Log in and use the Your e-PIT service

Step 2

On the PIT return form, click Select Organization

Step 3

In the list of organizations, search for Cancer Fighters Foundation or enter the KRS number 0000581036

Step 4

In the field with the specific goal of 1.5%, indicate the Ward by entering the following data:
  • KRS No.
    0000581036
  • Specific objective
    Leon Karolczak

Promote the collection

Download the prepared graphics and share them on social media. Encourage your friends to support and share. Put up a poster in your workplace, school, store. Every piece of information increases the chance of winning the Wards!

Every zloty and every share makes a huge difference. Help reach as many people as possible and increase the chances of this collection. Tell your friends, family and community - together we can do more!

Facebook
X / Twitter
WhatsApp
LinkedIn
Email
Threads

Contributions and words of support

Anonymous
April 21, 2026
20.00 00zł
Anonymous
April 20, 2026
PLN 50.00
Anonymous
April 20, 2026
PLN 200.00
Anonymous
April 20, 2026
20.00 00zł
Anonymous
April 20, 2026
PLN 50.00
Anonymous
April 20, 2026
PLN 200.00
Christopher
05/03/2026
Good health for your little one and strength for your whole family!
PLN 1,700.00
School Complex in Dłoni
March 11, 2026
We send lots of strength, hope, and support to Leon and his parents.
PLN 1,342.00
Cancer Fighters
04/03/2026
PLN 1,000.00
Monika
March 6, 2026
PLN 1,000.00
Patricia
March 6, 2026
PLN 1,000.00
Agata and Krzysztof
March 16, 2026
Cheers :-)
PLN 1,000.00