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Logo of nihpaAbout Author manuscriptsSubmit a manuscriptHHS Public Access; Author Manuscript; Accepted for publication in peer reviewed journal;
 
Br J Haematol. Author manuscript; available in PMC 2010 May 1.
Published in final edited form as:
PMCID: PMC2812732
NIHMSID: NIHMS163765

Beneficial and harmful effects of anthracyclines in the treatment of childhood acute lymphoblastic leukaemia: a systematic review and meta-analysis

Childhood Acute Lymphoblastic Leukaemia Collaborative Group (CALLCG)*

SUMMARY

Anthracyclines are used to treat childhood acute lymphoblastic leukaemia (ALL) but non-randomised studies suggest that cardiotoxicity may be a problem.

Individual patient data from trials in childhood ALL which randomized anthracyclines or methods of reducing cardiotoxicity were analysed by standard meta-analysis methods. Results were grouped and combined according to: addition of an anthracycline to standard therapy, type of anthracycline, mode of administration, and the use of a cardioprotectant.

Data from 958 patients in 4 trials, recruiting between 1972 and 1984, showed that addition of an anthracycline reduced bone marrow relapse and, non-significantly, non-bone marrow relapse, resulting in increased relapse free interval. However there was a non-significant increase in induction failures, and in deaths in first remission. Event free survival at 5 years was 56.7% with anthracycline versus 52.8% without (OR=0.91; 95% CI=0.76-1.10; p=0.3). There were no significant differences found in other treatment comparisons.

The limited data from trials did not demonstrate differences in clinically evident cardiotoxicity. Anthracyclines are effective against bone marrow relapse but have not been shown to significantly increase event free survival in childhood ALL. The evidence on type of anthracycline, method of administration or use of cardioprotectant is insufficient to be able to rule out important differences.

Keywords: Anthracycline, leukaemia, childhood ALL, meta-analysis, randomized

INTRODUCTION

There has been steady improvement in the outcome for children with acute lymphoblastic leukaemia (ALL), due to the gradual development of chemotherapy treatment protocols. One class of drug believed to play an important part in this is the anthracyclines, which were first introduced into randomized trials in the 1960s. Now that the great majority of children are cured it is important to try to make every effort to minimize any adverse long term effects of treatment. The most serious known adverse effect of anthracyclines is their cardiotoxicity (Elliott, 2006; Lipshultz, 2006). The emergence of this problem has led to the development of strategies aimed at reducing cardiac adverse effects while maintaining efficacy against the disease: including the use of cardioprotective therapies during anthracycline treatment, use of different derivatives of anthracyclines, and use of different infusion schedules during administration. A further concern long term with chemotherapy is the possible risk of second malignancies.

Despite the prominence of anthracycline treatment in childhood ALL there have been few studies of anthracycline safety specific to ALL in children. Also, only published data have been available for meta-analysis (Bryant et al, 2007; van Dalen et al, 2005; van Dalen et al, 2006a; van Dalen et al, 2006b). This review uses data on each individual patient to look at the total evidence available on the effectiveness of anthracyclines, and of the different methods aimed at reducing the long term cardiotoxicity, in treating childhood ALL. As useful data on cardiotoxicity were not available from the trials, a literature review was performed to identify evidence on cardiotoxicity from randomised controlled trials. As cardiotoxicity was not anticipated to be specific to ALL, evidence from all diseases was considered relevant. A Cochrane systematic review was found and, as this is the most reliable source when only published data are available, relevant results from this were included in the results section.

MATERIALS AND METHODS

Trials Included

Individual patient data were sought from all properly randomized trials, commencing before 2000, involving unconfounded treatment comparisons of anthracycline therapy for newly diagnosed childhood acute lymphoblastic leukaemia. Trials were included if at least 50% of patients were up to 21 years of age. The types of anthracycline therapy considered were: addition or not of an anthracycline to standard therapy; type of anthracycline; mode of administration of anthracycline; and the presence or not of a cardioprotectant.

Trials were identified following detailed searching of electronic clinical trial databases including MEDLINE and EMBASE. Additional hand searching was undertaken of content lists of major cancer and general medical journals, of review articles, of meeting abstracts and of reference lists of published trials. Members of the Childhood ALL Collaborative Group and other experts were consulted to ensure the completeness of the resulting list of trials.

Trial protocol details collected included period of recruitment, eligibility criteria, randomized treatment doses and timing, and any anthracycline treatment given in addition to that randomized.

Data Checking

For all trials the following information was sought on each patient aged 21 years or younger at random assignment to treatment: sex, white blood count (WBC) at diagnosis, immunophenotype, treatment allocation and site of first relapse; dates of birth, diagnosis, random assignment to treatment, first remission, relapse, and death or last contact; and the date and type of any secondary tumour.

Data were checked for internal consistency, balance between treatment groups by initial features, randomization dates, and length of follow-up, and consistency with publications on the trials. Data were amended only through correspondence with the principal trial investigators, who, additionally, received relevant summary tables for verification.

Events Analysed

Primary outcome measures were event free survival and overall survival (from date of randomization) with an event defined as any relapse or death. As these trials did not reliably record non-fatal secondary tumours, only fatal ones were included. Secondary outcome measures were no remission (defined as death without remission achievement), bone marrow (BM) relapse (including combined relapses with BM involvement), non-BM relapse, death in remission (including death due to secondary tumour), and relapse free interval which was defined as time to any relapse. In analyses of relapse, patients who died without achieving remission were excluded and deaths in remission were censored. Data were obtained only for first relapse, so analyses of a particular type of relapse are censored at relapse of any other type.

Grouping of trials and subgroup analyses

Trials were grouped and the results combined according to the type of treatment they compared. Trials addressing the addition of anthracycline treatment were subgrouped by the type of anthracycline and whether it was given in induction or maintenance. Comparisons by type of anthracycline were only combined if more than one trial addressed the same two types. Anthracycline administration trials comparing long duration infusion versus shorter administration were subgrouped by length of infusion time. Pre-specified subgroup analyses were by gender, age group (<10, ≥10), white blood count (WBC) (<10, 10-19, 20-49, 50-99, ≥100 × 109/l) and immunophenotype (B-lineage, T-lineage).

Statistics

Within trial analyses were of time from randomization to event, with the observed minus expected (o-e) number of events and its variance (v) obtained by the log-rank method. These o-e values were then added over all trials to produce a total (T), with variance (V) equal to the sum of the separate variances. These were used to calculate an overall odds ratio (OR), or ratio of event rates, and its 95% confidence interval (CI) equal to exp(T/V±1.96/√V). Results are presented as forest plots with a square representing the point estimate of the OR and horizontal line showing the 99% confidence interval for each trial. The size of the square is proportional to the amount of information available, with larger squares representing trials or subgroups with a larger number of events. Overall estimates are shown by a diamond with the width representing the 95% confidence interval. All p-values given are two-sided. Heterogeneity between the effects in different trials or subgroups was tested with Χ2n−1 equal to S-T2/V, where S is the sum of (o-e)2/v from each of n trials or n subgroups (EBCTCG, 1990).

T and V obtained by summing o-e and v from log rank analyses restricted to each one year time period were used to estimate the log OR, b, for each year. The estimated overall event rate in each time period, r, equals the number of events divided by the number of person years, and the probability of surviving event free during that year is exp(-r). Descriptive survival curves were drawn from the separate probability estimates p+0.5p(p-1)b for one treatment group, and p-0.5p(p-1)b for the other treatment group (EBCTCG, 1990).

RESULTS

The only trials for which data were not available were two older trials (1968-1978) looking at the addition of an anthracycline or not to standard therapy (SWOG 690/691, and ALGB 6801)

Addition of an anthracycline

Eight trials were found, but two were excluded (one only included patients aged over 20 years (CALGB 7612) and one was in relapsed disease (POG 869)). Details of the included trials are shown in table I. One trial (DFCI 73001) randomized children between the addition of daunorubicin, doxorubicin, or neither to induction treatment. Doxorubicin was included in consolidation for all patients, whereas the other trials only included anthracyclines in treatment if randomized to them. Five trials randomized daunorubicin, one (ALGB 6801) for use during both induction and maintenance, two during induction (DCLSG-ALL-V/EORTC 99801 and MRC UKALLVIII) and two during maintenance therapy (DCSLG-ALL-1 and SWOG 690/691). Cumulative doses in these trials were all below 100 mg/m2 daunorubicin, 80 mg/m2 doxorubicin, or 60 mg/m2 daunorubicin plus 35 mg/m2 doxorubicin. In the DFCI 73001, DCLSG-ALL-V/EORTC 99801 and MRC UKALLVIII trial protocols all patients received cranial irradiation. It was randomized in SWOG 690/691, and not given in DCSLG-ALL-1 and ALGB 6801.

Table I
Trial characteristics

Individual patient data were available for four of the six eligible trials, involving a total of 455 events in 958 patients. Median follow-up for these 4 trials was long, at 13.6, 16.1, 22.5 and 24.1 years (table II). There was a reduction in bone marrow relapse (OR = 0.77; 95% CI = 0.60 to 1.00; p=0.05) with anthracycline, and a non-significant reduction in non-bone marrow relapse (OR=0.88; 95% CI = 0.63 to 1.25; p=0.5). This resulted in improved relapse free interval (OR = 0.81; 95% CI = 0.66 to 1.00; p=0.05). However, there was a non-significant increase in induction failures (21 versus 14; OR=1.44; 95% CI = 0.73 to 2.82; p=0.3), and in deaths in first remission (32 versus 21; OR = 1.45; 95% CI = 0.84 to 2.48; p=0.2) (table III). In these trials, only one patient who failed to achieve remission survived to the end of the follow-up period. Thus the addition of an anthracycline did not significantly affect event free interval, either overall (OR = 0.91; 95% CI = 0.76 to 1.10) (figure 1), or if the comparison was restricted to induction trials (OR = 0.88; 95% CI = 0.72 to 1.06). Within the induction failures, there was a non-significant increase in the number of early deaths in the anthracycline group (14 versus 6 within 40 days; p=0.08) but similar numbers of later deaths, likely to be due to resistant disease, in the two groups (7 versus 8). Event free survival at 5 years was 56.7% with anthracycline versus 52.8% without (figure 2), with a long term difference of 3.7% (95% CI = −3.2% to 10.6%).

Figure 1
Effect of the addition of an anthracycline on overall event rate.
Figure 2
Descriptive curve showing the effect of the addition of an anthracycline on (a) event free survival and (b) overall survival.
Table II
Patient characteristics
Table III
Effects of treatment on different endpoints.

There was no significant heterogeneity between trials, and no evidence of a different effect in any age, sex, WBC or immunophenotype subgroup. However immunophenotype data were very limited in these trials, which all began in or before 1981 (table II). Additionally, NCI risk subgroups were examined (High risk: WBC≥50 or age ≥10; Standard risk: all other) but did not reveal any heterogeneity. The only trial which used doxorubicin (DFCI 73001) was too small to enable indirect comparisons of the effects of different types of anthracycline.

Type of Anthracycline

Four trials comparing different anthracyclines were found, but one was excluded as it was for relapsed patients (CCG 1884). One small trial (DFCI 73001) compared daunorubicin with doxorubicin on day 1 of induction, with all patients receiving one dose of doxorubicin in consolidation. Another small trial (New Delhi 1989) compared 4 doses of epirubicin with 4 doses of doxorubicin in induction, with all patients receiving 4 doses of doxorubicin in intensification. The numbers of patients involved are too small to draw conclusions on clinical outcomes, but, for completeness, numbers of events are given in table III.

One trial (FRALLE 93) randomized 532 children between 2 doses of daunorubicin or 2 doses of idarubicin in induction. Patients received a further dose of randomised anthracycline if their marrow was not blast free at day 21. All patients received 3 doses of doxorubicin in intensification.

Cumulative doses in these trials were: 60 mg/m2 daunorubicin plus 35 mg/m2 doxorubin or 80 mg/m2 doxorubicin (DFCI 73001); 80 (or 120) mg/m2 daunorubicin plus 75 mg/m2 doxorubicin or 16 (or 24) mg/m2 idarubicin plus 75 mg/m2 doxorubicin (FRALLE 93); and 240 mg/m2 doxorubicin or 120 mg/m2 doxorubicin plus 180 mg/m2 epirubicin (New Delhi 1989).

No significant differences in any outcome measure were found (table III), but median follow-up available for FRALLE 93 is only just over 3 years at present.

There were insufficient data to make subgroup analyses meaningful.

A Cochrane systematic review suggested that for adults the rate of clinical heart failure (CHF) might be lower with epirubicin compared with doxorubicin(van Dalen et al, 2006a). In adult patients with solid tumours there were 3 cases of CHF among 521 patients randomised to epirubicin, and 12 cases among 515 patients randomised to doxorubicin. However the difference was not statistically significant even with over 1000 patients randomised, as the number of events was small (RR = 0.35, 95% CI 0.12 to 1.11; p = 0.07). Two trials (Batist et al, 2001; Harris et al, 2002) comparing liposomal-encapsulated versus conventional doxorubicin appeared to indicate that the former reduced CHF in adult patients with breast cancer. There were 2 cases of CHF in 250 patients randomised to liposomal-encapsulated and 14 cases in 271 patients randomised to conventional doxorubicin (RR = 0.20; 95% CI 0.05 to 0.75; p=0.02). This Cochrane review found no published results for children or for leukaemia, and data on cardiotoxicity was not collected for the trials in our review.

Methods of administration

Three trials including 437 children compared slow infusion, over 24 or 48 hours, with short infusion over 1 hour or bolus injection. In the two trials giving anthracycline by 48 hour infusions, either no (MSK-NY-II), or just 2 doses (DFCI ALL 91-001), of anthracycline were given apart from the randomized treatment. However, in the third trial (COALL-05-92) the randomized comparison only applied to one dose in the pre-phase period and all patients had further anthracycline doses by one hour infusion (three in induction, and two in reinduction, plus two more if high risk). Cumulative doses were 600 mg/m2 daunorubicin, 330 mg/m2 doxorubicin, and 60 or 120 mg/m2 doxorubicin plus 144 mg/m2 daunorubicin, respectively. Median follow-up was over 8 years for all these trials.

No significant differences in outcome were found (figure 3, table III), nor evidence of any different effect in any subgroup. All those who failed to achieve remission died.

Figure 3
Effect of the method of anthracycline administration on overall event rate. Abbreviations and symbols as in figure 1.

A Cochrane systematic review shows that there is evidence that giving anthracyclines to adult cancer patients by an infusion of 6 or more hours reduces cardiotoxicity (van Dalen et al, 2006b). Outcomes examined in the review were CHF and subclinical heart failure (SHF), defined as ≥10% decrease in left ventricular ejection fraction (LVEF). Two trials were for childhood ALL, but relevant data were not available from the publications so these could not be included in the analyses. One trial, DFCI ALL91-001, reported echocardiogram measurements for 121 children and concluded that both regimens used were associated with progressive subclinical cardiotoxicity (Lipshultz et al, 2002). The other, MSK-NY-II, reported on 36 patients monitored with serial echocardiograms (Steinherz et al, 1993). Four children, all on the bolus arm, had a clinically significant decrease in cardiac function, but this difference was not statistically significant (p = 0.10). The small numbers randomised mean that there is a lack of information with respect to longer duration infusions in children for both cardiotoxicity and disease recurrence.

Cardioprotectant

Two trials involving 568 children compared anthracycline with the addition of cardioprotectant to the same anthracycline treatment. Median follow-up was 6 years. The cumulative anthracycline doses given in these trials, which both used doxorubicin, were 300 mg/m2 and 360mg/m2. Median follow-up is over 5 years.

There were no significant differences seen for any endpoint (table III). For event free survival the OR = 1.02 (95% CI = 0.72 to 1.44) (figure 4). Event free survival at 5 years was 77.0% with, and 77.5% without, cardioprotectant, a difference of −0.5% (95% CI = −7.7% to 6.8%). There was no evidence of any different effect within subgroups.

Figure 4
Effect of cardioprotectant on overall event rate.

A Cochrane systematic review of cardioprotectants showed that there were insufficient data for any conclusions on any drug except for dexrazoxane (van Dalen et al, 2005). In meta-analysis of 5 trials of dexrazoxane which included mainly adults, but also some children, with solid tumours, a reduction in the rate of CHF was demonstrated (RR = 0.18; 95% CI 0.10 to 0.35; p<0.00001), with 10 cases of CHF in 472 patients randomised to dexrazoxane and 59 in 503 control patients.

The randomised trials in the current meta-analysis have not reported on CHF and surrogate measures of heart failure have yielded little information. In DFCI ALL 95-001, there were no significant differences between treatments in echocardiogram measurements performed in a subgroup of children (Lipshultz et al, 2004). A recent review of clinical and cost-effectiveness of cardioprotection in children with cancer, which included one additional (non-randomised) study more than the current review, also reported that conclusions could not be drawn given the limited quality and quantity of the evidence (Bryant et al, 2007).

DISCUSSION

It is likely that anthracyclines are effective against ALL in childhood. Relapses were prevented with their use, but the increased incidence of treatment related deaths resulted in no significant effect on event free survival. However, the event free survival with modern protocols is generally about 20% higher than in the trials included in the review, so the average absolute benefit obtained by adding an anthracycline is likely to be smaller. Randomised evidence on cardiotoxicity comes from trials which mostly used higher cumulative doses of anthracyclines than are generally used for childhood ALL.

There are insufficient data comparing different types of anthracyclines to draw firm conclusions on differences in event rates, with only the daunorubicin versus idarubicin comparison including a significant number of patients. Even here there was only one trial (FRALLE 93), and an absolute difference in events of as much as 10% cannot be ruled out. Treatment with different anthracycline derivatives or formulations may affect cardiac adverse events. A Cochrane systematic review in adults with various cancers demonstrated significantly reduced rates of subclinical and clinical heart failure with liposomal encapsulated doxorubicin compared with standard doxorubicin (van Dalen et al, 2006a), with no evidence to suggest any differences in anti-tumour response rate or survival. The review also suggested a lower rate of clinical heart failure with epirubicin compared with doxorubicin treatment, although the difference was non-significant.

The limited evidence on giving anthracycline as continuous infusion over 24 or 48 hours did not suggest a difference in effectiveness, although in two of these trials, all patients also received some standard administration of i.v. anthracycline during induction, which may have weakened the comparison.

Previous cardiac studies have shown impairment in both adults and children with long-infusion, suggesting that it may not in any case be a way of preventing clinical cardiotoxicity. However, in some reports, different dosage schedules of anthracycline have been found to affect the incidence of cardiac damage. The meta-analysis of trials in adults showed a statistically significant lower rate of heart failure with an infusion duration of 6 or more hours compared with a duration of 1 hour or less, but data were not available for children. A lower incidence of subclinical cardiac damage was also observed with longer infusions, although this effect was not statistically significant (van Dalen et al, 2006b).

The use of dexrazone as a cardioprotectant seems more promising, with evidence that it has a beneficial effect on surrogate measures of cardiac damage. However, although the totality of the evidence does not show that it affects the activity of anthracycline against the disease, the small number of patients randomized means that an absolute difference in event free survival of as much as 7% cannot be ruled out. Event free survival in these trials was 77% at 5 years. Even if newer treatments were to increase this to 85%, applying the relative event rate estimates from the trial evidence would include a possible 5% detriment with cardioprotectant.

A recent systematic review of published data looking at the clinical and cost-effectiveness of cardioprotection found some limited evidence of protection against toxicity (Bryant et al, 2007). In the only two studies in children, dexrazoxane (Lipshultz et al, 2004) and coenzyme Q10 (Iarussi et al, 1994) were reported to protect cardiac function during anthracycline therapy. In another review in adult cancer patients a meta-analysis of 6 studies found that dexrazoxane showed a statistically significant protective benefit against development of heart failure (van Dalen et al, 2005).

No different treatment effects were found in age, sex, WBC or immunophenotype subgroups for any of the review questions. However, although this review used all available data in childhood ALL, the meta-analysis did not include sufficient numbers of patients in subgroups to rule out differences that may exist, particularly in immunophenotype, for which data were very limited in the early trials.

Primary outcome measures in the meta-analysis were event free survival and overall survival. Cardiotoxicity data were not generally collected in the trials, but in any case, the follow up times may have been too short to demonstrate any differences in cardiac damage. It is questionable whether a surrogate endpoint such as subclinical heart failure should be used rather than death.

Anthracycline therapy has been used in childhood ALL since the1960s, since when it may have contributed to the increase in the 5 year survival rate from 30% to its current level of over 70% (Gatta et al, 2002). However due to the risk of cardiac damage and heart failure there has been a tendency in some countries to drop the use of anthracyclines in their treatment protocols or to use them only for selected high risk cases.

Numerous retrospective studies have assessed the cardiac risk of anthracyclines in children. Prevalence of subclinical cardiac damage of up to 56% has been reported in children 6.4 years following anthracycline treatment for various cancers (Kremer et al, 2002b), with a risk of developing clinical heart failure of 2% at 2 years and 5% at 15 years following treatment (Kremer et al, 2001). Reported incidence of heart failure varies from 0% to 16% at 0.9-4.6 years following anthracycline treatment (Kremer et al, 2002a). The only independent risk factor yet identified is a cumulative anthracycline dose of 300 mg/m2. In a long term follow up study of 830 children this dosage increased the risk of heart failure to 9.8% at 20 years compared with 0.5% for patients receiving less than 300 mg/m2 (van Dalen et al, 2006c).

CONCLUSION

Anthracyclines significantly reduced bone marrow relapse when added to standard therapy but did not significantly increase event free survival. There were no significant differences in any relapse, event or death between any anthracycline derivatives, between 48 or 24 and 1 hour anthracycline infusions or between treatment with or without the cardioprotectant dexrazoxane. Keeping cumulative doses below 300mg/m2 appears to reduce cardiotoxicity but there is no clear evidence that other strategies have an effect. Future studies need to be larger, longer term, and to look at clinically important outcomes. With the high survival rates on current protocols and the possibility of long term cardioxicity even at lower doses, whether anthracyclines are necessary for at least some patients remains an important issue. This meta-analysis suggests that, since they appear to have a valuable anti-leukaemic effect but involve increased toxicity, especially cardiac, they should perhaps be reserved for higher risk patients.

Acknowledgments

The secretariat for this work was at CTSU, Oxford University. The work was funded by a grant from the Kay Kendall Leukaemia Fund (KKL293) with additional support from Cancer Research UK and Medical Research Council. Funders were not involved in the design, analysis or reporting.

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