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Gluck et al. 299<br />

Sudbury patients were treated on one of the two high-dose chemotherapy<br />

regimens. Regimen 1: cyclophosphamide 3 g/m 2<br />

/day intravenously for 2 days;<br />

mitoxantrone 23 mg/m 2<br />

/day intravenously for 3 days; vinblastine 12 mg/m 2<br />

intravenously as continuous infusion over 5 days. Regimen 2: cyclophosphamide 3<br />

g/m 2<br />

/day intravenously for 2 days; mitoxantrone 23 mg/m 2<br />

/day intravenously for 3<br />

days; carboplatin 800 mg/m 2<br />

intravenously for 1 day; <strong>and</strong> stem cell infusion 48-72<br />

hours postchemotherapy.<br />

RESULTS<br />

Patients<br />

The datasets consisted of patients treated between 1 January 1991 <strong>and</strong> 31<br />

December 1995. The UNMC high-dose chemotherapy dataset contained 77 eligible<br />

évaluable UNMC patients. The NEORCC high-dose dataset consisted of 77<br />

eligible patients, for a total of 154 patients. The ORCC st<strong>and</strong>ard-dose<br />

chemotherapy database consisted of 154 patients.<br />

Overall survival outcomes<br />

The median survival of all patients after the development of overt<br />

recurrent/metastatic disease was 27.4 months (95% CI 25.6-33.1). When<br />

grouped by treatment, the median survival of patients treated with st<strong>and</strong>ard<br />

chemotherapy was 25.6 months (95% CI 23.1-33.2), <strong>and</strong> for patients treated<br />

with high-dose chemotherapy, 28.1 months (95% CI 26.4-36.1). This<br />

difference was not statistically significant by univariate testing (unadjusted<br />

P=0.39 by log-rank, P=0.43 by Tarone-Ware). Using the Cox proportional<br />

hazards model with stepwise regression analysis to adjust for the effects of<br />

multiple potential confounding variables, a highly significant treatment effect<br />

was found in favor of high-dose therapy (/ ><br />

=0.0076, hazard ratio 0.62, 95% CI<br />

0.27-0.97).<br />

Failure-free survival; all patients<br />

The median duration of failure-free survival for all patients after chemotherapy<br />

was 12.4 months (95% CI 11.2-14.3). Using the Cox proportional hazards model<br />

<strong>and</strong> stepwise regression analysis to adjust for the effects of multiple potential<br />

confounding variables (excluding type of treatment), factors that had an<br />

independent effect on failure-free survival were determined. When grouped by type<br />

of treatment, the median failure-free survival of patients treated with st<strong>and</strong>ard<br />

chemotherapy was 9.8 months (95% CI 8.8-11.4), <strong>and</strong> for patients treated with

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