Many of the improvements in survival in childhood cancer have been made using new therapies that have attempted to improve on the best available, accepted therapy. Clinical trials in pediatrics are designed to compare potentially better therapy with therapy that is currently accepted as standard. This comparison may be done in a randomized study of 2 treatment arms or by evaluating a single new treatment, comparing the results with those previously obtained with standard therapy.

Because of the relative rarity of cancer in children, all children with liver cancer should be considered for entry into a clinical trial. Treatment planning by a multidisciplinary team of cancer specialists with experience treating tumors of childhood is required to determine and implement optimum treatment.Involvement of surgeons with experience in pediatric liver resection is critical, as operative and perioperative mortality may be as high as 5%.[1]

Historically, resection of the primary tumor has been required to cure malignant liver tumors in children.[2,3] Preoperative chemotherapy can convert a nonresectable tumor to a resectable one. Chemotherapy in some cases is able to eradicate pulmonary metastases completely and eliminate multinodular tumor foci in the liver. Chemotherapy has been much more successful in the treatment of hepatoblastoma than in hepatocellular carcinoma.[3-8] In recent years, virtually all children with hepatoblastoma have been treated with chemotherapy, and in some centers, even children with resectable hepatoblastoma are treated with preoperative chemotherapy, which may reduce the incidence of surgical complications at the time of resection.[1,9] In an international study, preresection treatment with doxorubicin and cisplatin was given to all children with PRETEXT stage 2, 3, or 4 hepatoblastoma with or without metastases and was well tolerated. PRETEXT stage 1 hepatoblastoma was resected and then treated with the same chemotherapy. Following chemotherapy, and excluding those who received liver transplant (<5% of patients), complete resection was obtained in 87% of children. This strategy resulted in an overall survival of 75% at 5 years after diagnosis for all children entered on the study.[9] In contrast, the current American Intergroup protocol for treatment of children with hepatoblastoma encourages resection at the time of diagnosis for all tumors amenable to resection without undue risk. The protocol does not treat children with stage I tumors of purely fetal histology with preoperative or postoperative chemotherapy unless they develop progressive disease.[10] Further study will be needed to determine whether presurgical chemotherapy is preferable to resection followed by chemotherapy for children with PRETEXT stage 2, 3, and 4 hepatoblastoma.

Surgical resection of distant disease has also contributed to the cure of children with hepatoblastoma. Resection of pulmonary metastases is recommended when the number of metastases is limited [11] and is often performed at the same time as resection of the primary tumor. When possible, resection of areas of locally invasive disease, such as in the diaphragm, and of isolated brain metastasis is recommended.[12]

Radiation therapy, even in combination with chemotherapy, has not cured children with nonresectable tumors. There may be a role for radiation therapy in the management of incompletely resected hepatoblastoma,[5,13] though a study of 154 patients with hepatoblastoma did not confirm this finding.[1] Eleven patients had tumor found at the surgical margins following hepatic resection and only 2 patients died, neither of whom had a local recurrence. None of the 11 patients underwent a second resection and only one patient received radiation therapy postoperatively. All of the patients were treated with 4 courses of cisplatin and doxorubicin prior to surgery and received 2 courses of postoperative chemotherapy. This study shows that second resection of positive margins and/or radiation therapy may not be necessary in patients with incompletely resected hepatoblastoma whose residual tumor is microscopic.

Liver transplantation has recently been associated with significant success in the treatment of children with unresectable hepatic tumors. A review of the world experience has documented a posttransplant survival rate of 82% for children with hepatoblastomas.[14] Intravenous invasion, positive lymph nodes, and contiguous spread did not have a significant adverse effect on outcome. The United Network for Organ Sharing (UNOS) Standard Transplant and Research Files registry reported all children less than 18 years of age listed for a liver transplant in the United States from October, 1987 through July, 2004. Of these children, 135 had hepatoblastoma and 41 had hepatocellular carcinoma and both groups received liver transplant with 5-year survival rates of 69% and 63%, respectively. The 10-year survival rates were similar to the 5-year rates.[15] In a separate single-institution study for children with hepatocellular carcinoma, the overall 5-year disease-free survival rate was approximately 60%.[16] In hepatocellular carcinoma, vascular invasion, distant metastases, lymph node involvement, tumor size, and male gender were significant risk factors for recurrence. Pretransplant intra-arterial therapy was very effective in patients with hepatoblastoma but less efficacious in children with hepatocellular carcinoma. Because of the poor prognosis in patients with hepatocellular carcinoma, liver transplant should be considered for disorders such as tyrosinemia and familial intrahepatic cholestasis early in the course, prior to the development of liver failure and malignancy. The fibrolamellar variant of hepatocellular carcinoma may have a better outcome with liver transplant than other hepatocellular carcinomas.[17]

The designations in PDQ that treatments are “standard” or “under clinical evaluation” are not to be used as a basis for reimbursement determinations.

References

1. Schnater JM, Aronson DC, Plaschkes J, et al.: Surgical view of the treatment of patients with hepatoblastoma: results from the first prospective trial of the International Society of Pediatric Oncology Liver Tumor Study Group. Cancer 94 (4): 1111-20, 2002.  [PUBMED Abstract]
   
   
2. Tomlinson GE, Finegold MJ: Tumors of the Liver. In: Pizzo PA, Poplack DG, eds.: Principles and Practice of Pediatric Oncology. 4th ed. Philadelphia, Pa: Lippincott, Williams and Wilkins, 2002, pp 847-64. 
   
   
3. Katzenstein HM, Krailo MD, Malogolowkin MH, et al.: Hepatocellular carcinoma in children and adolescents: results from the Pediatric Oncology Group and the Children's Cancer Group intergroup study. J Clin Oncol 20 (12): 2789-97, 2002.  [PUBMED Abstract]
   
   
4. Ortega JA, Krailo MD, Haas JE, et al.: Effective treatment of unresectable or metastatic hepatoblastoma with cisplatin and continuous infusion doxorubicin chemotherapy: a report from the Childrens Cancer Study Group. J Clin Oncol 9 (12): 2167-76, 1991.  [PUBMED Abstract]
   
   
5. Douglass EC, Reynolds M, Finegold M, et al.: Cisplatin, vincristine, and fluorouracil therapy for hepatoblastoma: a Pediatric Oncology Group study. J Clin Oncol 11 (1): 96-9, 1993.  [PUBMED Abstract]
   
   
6. Ortega JA, Douglass EC, Feusner JH, et al.: Randomized comparison of cisplatin/vincristine/fluorouracil and cisplatin/continuous infusion doxorubicin for treatment of pediatric hepatoblastoma: A report from the Children's Cancer Group and the Pediatric Oncology Group. J Clin Oncol 18 (14): 2665-75, 2000.  [PUBMED Abstract]
   
   
7. Douglass E, Ortega J, Feusner J, et al.: Hepatocellular carcinoma (HCA) in children and adolescents: results from the Pediatric Intergroup Hepatoma Study (CCG 8881/POG 8945). [Abstract] Proceedings of the American Society of Clinical Oncology 13: A-1439, 420, 1994. 
   
   
8. Czauderna P, Mackinlay G, Perilongo G, et al.: Hepatocellular carcinoma in children: results of the first prospective study of the International Society of Pediatric Oncology group. J Clin Oncol 20 (12): 2798-804, 2002.  [PUBMED Abstract]
   
   
9. Pritchard J, Brown J, Shafford E, et al.: Cisplatin, doxorubicin, and delayed surgery for childhood hepatoblastoma: a successful approach--results of the first prospective study of the International Society of Pediatric Oncology. J Clin Oncol 18 (22): 3819-28, 2000.  [PUBMED Abstract]
   
   
10. Katzenstein HM, Children's Oncology Group: Phase III Randomized Study of Postoperative Cisplatin, Vincristine, and Fluorouracil in Children With Hepatoblastoma, COG-P9645, Clinical trial, Completed.  [PDQ Clinical Trial]
    
    
11. Feusner JH, Krailo MD, Haas JE, et al.: Treatment of pulmonary metastases of initial stage I hepatoblastoma in childhood. Report from the Childrens Cancer Group. Cancer 71 (3): 859-64, 1993.  [PUBMED Abstract]
    
    
12. Robertson PL, Muraszko KM, Axtell RA: Hepatoblastoma metastatic to brain: prolonged survival after multiple surgical resections of a solitary brain lesion. J Pediatr Hematol Oncol 19 (2): 168-71, 1997 Mar-Apr.  [PUBMED Abstract]
    
    
13. Habrand JL, Nehme D, Kalifa C, et al.: Is there a place for radiation therapy in the management of hepatoblastomas and hepatocellular carcinomas in children? Int J Radiat Oncol Biol Phys 23 (3): 525-31, 1992.  [PUBMED Abstract]
    
    
14. Otte JB, Pritchard J, Aronson DC, et al.: Liver transplantation for hepatoblastoma: results from the International Society of Pediatric Oncology (SIOP) study SIOPEL-1 and review of the world experience. Pediatr Blood Cancer 42 (1): 74-83, 2004.  [PUBMED Abstract]
    
    
15. Austin MT, Leys CM, Feurer ID, et al.: Liver transplantation for childhood hepatic malignancy: a review of the United Network for Organ Sharing (UNOS) database. J Pediatr Surg 41 (1): 182-6, 2006.  [PUBMED Abstract]
    
    
16. Reyes JD, Carr B, Dvorchik I, et al.: Liver transplantation and chemotherapy for hepatoblastoma and hepatocellular cancer in childhood and adolescence. J Pediatr 136 (6): 795-804, 2000.  [PUBMED Abstract]
    
    
17. Perilongo G, Brown J, Shafford E, et al.: Hepatoblastoma presenting with lung metastases: treatment results of the first cooperative, prospective study of the International Society of Paediatric Oncology on childhood liver tumors. Cancer 89 (8): 1845-53, 2000.  [PUBMED Abstract]
    
    

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