Leukemia (ALL and AML)

Overview

Board takeaway: Stabilize oral disease before chemotherapy, then coordinate care around blood counts during treatment.

The most common childhood cancer. Gingival changes may be the first clue.

How does the absolute neutrophil count change invasive dental planning for a child with leukemia?

Obtain a current CBC with differential and platelets with oncology before invasive care; account for the expected nadir and procedure-related bleeding.

How should platelet count and bleeding risk guide invasive dental care in a child with leukemia?

• Hemostasis: agree on transfusion needs, local measures, antifibrinolytics, and access to emergency support before proceeding.
• Central line: a central line alone does not automatically require prophylaxis; assess immune and other host risks separately.

How should pulpally involved primary teeth be managed before chemotherapy for leukemia?

• Pulpally involved primary teeth: extraction is often chosen before chemotherapy because evidence for pulp therapy is limited; individualize with oncology.
• Previously pulp-treated teeth that are asymptomatic and clinically/radiographically sound can be monitored.

How should oral hygiene and mucositis be managed during leukemia treatment?

• Home care: continue gentle soft-brush cleaning and tolerated fluoride toothpaste.
• When brushing is intolerable: if severe mucositis makes a regular soft brush intolerable, use the oncology team’s temporary alternative and resume effective brushing as soon as possible.
• Chlorhexidine: chlorhexidine may help poor hygiene or periodontal disease, but is not recommended to prevent or treat mucositis; avoid irritating alcohol-containing rinses.
• Mucositis: use tolerated bland saline/bicarbonate rinses and coordinated pain, hydration, and nutrition support.
• Rule out infection: assess superimposed candidiasis or HSV rather than assuming every ulcer is mucositis.
• Specialist prevention: specialist preventive options such as cryotherapy or photobiomodulation depend on the cancer regimen and resources.

How do urgency and blood counts determine the dental plan during leukemia treatment?

Defer elective care with ANC below 1,000/mm³; coordinate emergency infection control with oncology.

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For ANC below 1000, defer elective treatment. An abscess or other emergency still needs oncology-coordinated infection control; platelets, procedure, and bleeding risk determine hemostatic support independently.

Exam pearl

What is Leukemia (ALL and AML)?

Cancer of blood-forming tissues that produces abnormal blood cells and disrupts normal blood-cell production. Acute lymphoblastic leukemia (ALL) involves immature lymphoid cells; acute myeloid leukemia (AML) involves immature myeloid cells.

What are the main systemic features of Leukemia (ALL and AML)?

• ALL is ~80% of childhood leukemia; peak age 2–5; ~90% survival
• AML and associated risk: AML harder to treat; Down syndrome raises the risk of both
• Bone marrow failure: anemia (pallor, fatigue), neutropenia (infection), thrombocytopenia (bleeding)
• Treatment: Treated with multiagent chemotherapy, sometimes radiation and hematopoietic stem cell transplant

What oral findings occur at leukemia diagnosis and during treatment?

• At diagnosis: gingival enlargement (leukemic infiltrate, especially AML), spontaneous gingival bleeding, petechiae, ulcers, pallor
• During therapy: mucositis, candidiasis, HSV, xerostomia, taste change

What oral late effects need surveillance after childhood leukemia treatment?

Monitor survivors for dental developmental defects and late effects.

• Late developmental effects: agenesis, microdontia, short V-shaped roots, early apical closure, and enamel defects, especially with treatment before age five, radiation, or stem cell transplant
• After stem cell transplant: graft-versus-host disease

For Leukemia (ALL and AML), how do you approach an abscess with ANC 800 and platelets 45,000?

Contact oncology promptly for source control with infection and hemostatic support. An abscess needs a coordinated emergency plan; it is not an elective extraction clearance question.

1. ANC 800/mm³: defer elective procedures; oncology determines antibiotic coverage and whether hospital treatment is needed for this infection.
2. Platelets 45,000/mm³: selected procedures at this range are discussed in AAPD’s cited resources, but the count alone does not establish safety. Agree on the extraction/injection plan and any transfusion or antifibrinolytic support.
3. Treat and review: eliminate the dental source using the agreed setting and local hemostasis; arrange review for persistent infection or delayed bleeding.

A 4-year-old has gingival enlargement, spontaneous gingival bleeding, pallor and bruising. What do you do?

• Suspect acute leukemia: gingival infiltration is more typical of AML.
• Act the same day: obtain an urgent CBC with differential through the physician, avoid invasive treatment, and refer.

What dental care should you complete before a child with leukemia starts chemotherapy?

1. Assess and stabilize: examine and radiograph, then eliminate infection and sources of trauma in coordination with oncology. Plan extractions ideally 2 weeks before cancer therapy to allow healing; coordinate urgent cancer treatment rather than imposing a delay independently.
2. Primary teeth: extraction is often chosen for pulpally involved carious teeth; individualize the plan. Monitor previously pulp-treated teeth that remain asymptomatic and clinically/radiographically sound.
3. Infected extraction sites: AAPD recommends about one week of postoperative antibiotics when infection is documented at the extracted tooth, regardless of hematologic status; coordinate agent selection with oncology.
4. Appliances: remove fixed appliances when hygiene is poor or moderate-to-severe mucositis is expected; well-fitting, nonirritating appliances may remain when hygiene and tolerance permit.
5. Prevention: teach gentle soft-brush hygiene and fluoride use. Consider chlorhexidine for poor hygiene or periodontal disease when tolerated; it is not a universal pretreatment requirement or a mucositis therapy.

Sources

• Supplemental study guide: Pediatric Dental Study Guide: Leukemia
• Definition: NCI: Definition of leukemia
• Definition: NCI: Definition of ALL
• Definition: NCI SEER: Acute myeloid leukemia
• AAPD immunosuppressive therapy guidance (2026)
• Dental Management of Pediatric Patients Receiving Immunosuppressive Therapy and/or Head and Neck Radiation
• Common Laboratory Values