Childhood cancers - recognition and referral
Exam Tips
- Palpable unexplained abdominal mass/enlarged organ in a child -> very urgent specialist assessment within 48 hours.
- Unexplained visible haematuria in a child -> very urgent 48-hour referral for possible Wilms' tumour.
- Absent red reflex -> urgent suspected-cancer ophthalmology pathway; new squint plus absent red reflex -> immediate ophthalmology referral.
- In OSCEs, state referral timing explicitly (immediate vs within 48 hours vs within 2 weeks) and document safety-net advice.
- Parental persistent concern is itself a referral modifier in paediatric suspected cancer assessment.
Definition
Childhood cancer recognition and referral in UK primary care focuses on early identification of red-flag features of neuroblastoma, retinoblastoma, and Wilms' tumour in children (birth to 15 years), followed by time-critical specialist referral. It is a diagnostic-safety pathway rather than definitive treatment guidance, aiming to reduce delay to diagnosis and improve survival by acting on specific signs such as abdominal mass, visible haematuria, and absent red reflex.
Pathophysiology
Neuroblastoma is an embryonal neuroendocrine malignancy from neural crest-derived sympathetic tissue (commonly adrenal/abdominal), so it often presents as an abdominal mass and may metastasize early. Retinoblastoma is a malignant retinal tumour driven by biallelic RB1 loss, producing leukocoria (loss of normal red reflex) and sometimes strabismus. Wilms' tumour (nephroblastoma) is an embryonal renal malignancy arising from abnormal nephrogenic tissue, typically in toddlers, causing a palpable renal mass with possible pain or haematuria.
Risk Factors
- Age under 5 years (especially infancy for neuroblastoma; 1-3 years for Wilms' tumour)
- Family history of retinoblastoma or known RB1 mutation
- Cancer predisposition syndromes linked to Wilms' tumour (for example WAGR, Denys-Drash, Beckwith-Wiedemann, isolated hemihyperplasia)
- Embryonal tumour predisposition/developmental abnormalities
Clinical Features
Symptoms
- Parent/carer report of a new abdominal lump or abdominal swelling
- Unexplained visible haematuria
- Abdominal pain with abdominal mass (more suggestive of Wilms' tumour)
- Parent/carer noticing white pupillary reflex in photographs or low light (leukocoria)
- Persistent parental/carer concern about ongoing unexplained symptoms even when a benign cause seems likely
Signs
- Palpable abdominal mass or unexplained enlarged abdominal organ
- Absent fundal red reflex in one or both eyes (leukocoria; see figure reference: red-reflex/leukocoria examination images in paediatric ophthalmology texts)
- New-onset squint with concurrent loss of red reflex (requires immediate ophthalmology referral)
Investigations
Management
Lifestyle Modifications
- Explain clearly to family that referral is to exclude/confirm cancer quickly; most referred children will not ultimately have cancer
- Safety-net explicitly: worsening pain, reduced oral intake, lethargy, or new visual symptoms should trigger same-day re-assessment
- Incorporate persistent parental/carer concern into decision-making rather than relying only on single-visit findings
- Make referral within 1 working day once decision is made; include urgency category and key findings in referral documentation
Pharmacological Treatment
Symptom control while awaiting specialist review (does not replace urgent referral)
- Paracetamol oral 15 mg/kg every 4-6 hours (max 4 doses in 24 hours; usual max 60 mg/kg/day)
- Ibuprofen oral 5-10 mg/kg every 6-8 hours (max 30 mg/kg/day)
No primary-care anticancer drug treatment should be started for suspected neuroblastoma/retinoblastoma/Wilms' tumour. Use analgesia only if needed and do not delay referral for response to treatment. Avoid or use caution with NSAIDs in dehydration, significant renal impairment, active bleeding risk, or uncertain renal pathology.
Surgical / Interventional
- Retinoblastoma: specialist eye-oncology treatment may include focal therapy, chemotherapy, and in selected cases enucleation
- Wilms' tumour: paediatric oncology surgery (often nephrectomy in multimodal treatment pathway)
- Neuroblastoma: risk-adapted multimodal treatment including surgery after specialist staging
Complications
- Diagnostic delay with stage progression and reduced cure probability
- Metastatic spread (for example bone/bone marrow in neuroblastoma)
- Visual loss or loss of eye in advanced retinoblastoma
- Renal impairment or treatment-related long-term morbidity in Wilms' tumour survivors
- Psychological distress for child and family during urgent cancer work-up
Prognosis
Overall outcomes are good when referral is prompt: 5-year survival is about 50-90% for neuroblastoma (stage/risk dependent), almost 100% for retinoblastoma, and around 90% for Wilms' tumour.
Sources & References
✅NICE Guidelines(1)
📖Textbook References(4)
- David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 115)[context]
- David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 1013)[context]
- Guyton and Hall Textbook of Medical Physiology (John E. Hall, Michael E. Hall) (Z-Library).pdf(pp. 718)[context]
- [Oxford Medical Handbooks] Ian Wilkinson, Tim Raine, Kate Wiles, Anna Goodhart, Catriona Ha - Oxford Handbook of Clinical Medicine (2017, Oxford University Press) - libgen.li.pdf(pp. 276)[context]