Update on lymphoma

Multi-drug resistance 1 genetic polymorphism and prediction of chemotherapy response in Hodgkin's Lymphoma

Background

The human multi-drug resistance gene (MDR1), which encodes the major trans-membrane transporter P-glycoprotein (P-gp), was found to be associated with susceptibility to cancer and response to chemotherapy. The C3435T Polymorphism of MDR1 gene was correlated with expression levels and functions of P-gp. Here, we studied the association between MDR1 C3435T polymorphism and susceptibility to Hodgkin lymphoma (HL) and patient's response to ABVD chemotherapy regimen.

Methods

a total of 130 paraffin embedded tissue samples collected from HL patients were analyzed to identify the C3435T polymorphism. As a control group, 120 healthy subjects were enrolled in the study. The C3435T Polymorphism was genotyped by polymerase chain reaction and restriction fragment length polymorphism (PCR-RFLP) method. Data analysis was carried out using the statistical package SPSS version 17 to compute all descriptive statistics. Chi-square and Fisher exact tests were used to evaluate the genotype distribution and allele frequencies of the studied polymorphism.

Results

these studies revealed that the frequency of T allele was significantly higher in HL patients compared to the controls (P < 0.05). In addition, the frequency of CT and TT genotypes were also significantly higher in HL patients compared to the controls (P < 0.05). No association between C3435T polymorphism and response to ABVD was detected among HL patients (P > 0.05).

Conclusions

these results suggest that MDR1 C3435T polymorphism might play a role in HL occurrence; however this polymorphism is not correlated with the clinical response to ABVD.

How much does it cost to treat children with Hodgkin lymphoma in Africa?

Hodgkin lymphoma (HL) is a common B-cell childhood neoplasm and it has a higher incidence in the 0-14 year age group in developing countries compared to developed countries. Treatment achieves a cure rate of about 80%. In African countries with a small gross domestic product per capita the cost of treating HL in children may be prohibitive. To determine the direct costs of treatment of HL in South Africa and to propose a more cost-effective approach to investigation and treatment for children diagnosed with HL in Africa, tumor registry data for 138 children with HL from two South African hospitals were analysed retrospectively. The cost of treatment for stage 2 disease was calculated, including investigations and chemotherapy. The analysis included the cost of a follow-up period of 2 years. Stage 2 was the most common stage seen, and ABVD protocol was the most common protocol used. The total cost of diagnosing, staging, treating with chemotherapy and following up a child with stage 2 HL for 2 years post-therapy was ZAR 53178.20 = USD 6647.27 = EUR 4431.51. Follow-up expenditure was much higher than initial chemotherapy costs. The major factors driving the cost for the whole group of 138 patients were as follows: stage, radiologic imaging, radiotherapy, second-line chemotherapy, hospitalisation and febrile neutropenia. The total cost of treatment of HL is affordable for first world countries, but it remains expensive for developing countries, especially in Africa where the GDP is often under USD 2000 per head. Early diagnosis, use of less toxic protocols such as ABVD, close monitoring to prevent complications and elimination of unnecessary tests and investigations may reduce the overall cost.