Cancer Flashcards
Discuss factors that differentiate childhood cancer from adult cancer.
Pediatric cancers most often arise from primitive embryonal (mesodermal) and neuroectodermal tissues, resulting in leukemias, lymphomas, sarcomas, or central nervous system tumors.
Adult cancers arise from epithelial cells, causing cancer.
Childhood Cancer
- usually affects the tissues
- histologic type: embryonal, leukemia, lymphoma
- sites: blood, lymph, bone, brain, kidney
- only small amount from enviroment
- unknown prevention
- usually incidental or accidental detection
-latent period: short - extent of disease: metastasis is often present at diagnosis
Treatment: very responsive
Adult Cancer
- usually in organ
- epithelial in origin
- great, lung, prostate, bowel, bladder
- environment: strong influence
- 80% preventable
- very early detection possible
- Latent period: can be very long
- metastasis is less often pressent
- treatment: less responsive
Acute Lymphoblastic Leukemia
-most COMMON form of cancer in children, 85%
- most common in white children
- T celll, B cell, early pre-B cell, or pre-B cell
Overall cute: over 70*
-Prognosis is based on the WBC count at diagnosis, the type of cytogenetic factors and immunophenotype, the age at diagnosis, and the extent of extramedullary involvement. Generally, the higher the WBC count at diagnosis, the worse the prognosis. Children between 1 and 9 years of age and with a WBC count less than 50,000 at diagnosis have the best prognosis. When a child experiences a relapse, the prognosis becomes poorer. Complications include infection, hemorrhage, poor growth, and CNS, bone, or testicular involvement.
Pathophysiology: ALL
- exact cause unknown; genetic factors and chromosome abnormalities pay role in its development
ALL, abnormal lymphoblasts abound in the blood-forming tissues. The lymphoblasts are fragile and immature, lacking the infection-fighting capabilities of the normal WBC. The growth of lymphoblasts is excessive and the abnormal cells replace the normal cells in the bone marrow. The proliferating leukemic cells demonstrate massive metabolic needs, depriving normal body cells of needed nutrients and resulting in fatigue, weight loss or growth arrest, and muscle wasting. The bone marrow becomes unable to maintain normal levels of RBCs, WBCs, and platelets, so anemia, neutropenia, and thrombocytopenia result. As the bone marrow expands or the leukemic cells infiltrate the bone, joint and bone pain may occur. The leukemic cells may permeate the lymph nodes, causing diffuse lymphadenopathy, or the liver and spleen, resulting in hepatosplenomegaly. With spread to the CNS, vomiting, headache, seizures, coma, vision alterations, or cranial nerve palsies may occur
adverse effects L ALL
changes in personality, headache, irritability, dizziness, persistent nausea, vomiting, seizures, lethargy, alter conscious, may indicate CNS infiltration. Immediately tell physician.
Therapeutic Management: ALL
giving chemotherapy to eradicate the leukemic cells and restore normal bone marrow function. Treatment is divided into 3 stages. CNS prophylaxis is provided at each stage in order to prevent metastasis to the CNS (Craddock et al., 2018). The length of treatment and choice of medications are based on the child’s age, risk category, and subtype determined by bone marrow analysis. Table 24.7 discusses the stages of leukemia treatment. For relapsed or less responsive leukemia, HSCT may be necessary
What is the purpose of Induction
Rapid induction of complete remission ; 3-4 weeks
What are medications for induction?
Oral steroids, IV vincristine, IM L-asparaginase, daumycin (high risk)
What is the purpose consolidation?
strengethen remisssion, reduce leukemic cell burden, varies
what type of medication for consolidation?
High-dose methotrexate, 6-mercaptopurine; possibly cyclophosphamide, cytarabine, asparaginase, thioguanine, epipodophyllotoxins
What is the maintenance stage?
Eliminate all residual leukemic cells ; 2-3 years
What medications for Maintainene cancer?
Low dose: daily 6-mercaptopurine, weekly methotrexate, intermittent IV vincristine, and oral steroids
What is CNS prophylaxis?
reduce risk of development of CNS disease ; given periodcally
Medications for CNS prophylaxis?
Intrathecal chemotherapy; cranial radiation is used infrequently
S/s of ALL
Fever (may be persistent or recurrent, with unknown cause) Recurrent infection Fatigue, malaise, or listlessness Pallor Unusual bleeding or bruising Abdominal pain Nausea or vomiting Bone pain Headach
Nursing Alert** ALL
Have the child lie flat for 30 minutes after a lumbar puncture and increase fluid intake for 24 hours after the procedure to decrease incidence of headache
Laboratory and Diagnostic Tests
CBC: abnormal findings include low hemoglobin and hematocrit, decreased RBC count, decreased platelet count, and elevated, normal, or decreased WBC count Peripheral blood smear may reveal blasts. Bone marrow aspiration: stained smear from bone marrow aspiration will show greater than 25% lymphoblasts. Bone marrow aspirate is also examined for immunophenotyping (lymphoid vs. myeloid, and level of cancer cell maturity) and cytogenetic analysis (determines abnormalities in chromosome number and structure). Immunophenotyping and cytogenetic analysis are used in the classification of the leukemia, which helps guide treatment. Lumbar puncture will reveal whether leukemic cells have infiltrated the CNS. Liver function tests and blood urea nitrogen (BUN) and creatinine levels determine liver and renal function, which, if abnormal, may preclude treatment with certain chemotherapeutic agents. Chest radiography may reveal pneumonia or a mediastinal mass.
**
The child with leukemia undergoes frequent implantable port accesses for blood draws and chemotherapy, bone marrow aspirations for assessment of blood cell status, and lumbar punctures for laboratory studies and intrathecal medication administration. To decrease trauma produced by these repetitive painful procedures, utilize EMLA (eutectic mixture of local anesthetics) cream appropriately. Teach the child’s primary caregiver to apply the cream to the implantable port site 30 minutes to 1 hour prior to the child’s clinic appointment time. Apply EMLA cream to the posterior hip or lumbar spine, 1–3 hours prior to bone marrow aspiration or lumbar puncture.
Alert
Blood products administered to children with any type of leukemia should be irradiated, cytomegalovirus (CMV) negative, and leukodepleted. This treatment of blood products before transfusion will decrease the amount of antibodies in the blood, an important factor in preventing GVHD should HSCT become necessary at a later date