Evaluating high dose therapy in Multiple Myeloma: use of quality-adjusted survival analysis.
OBJECTIVE
To incorporate quality-of-life considerations in assessing high dose therapy (HDT) for patients with Multiple Myeloma (MM).


METHODS
A quality-adjusted survival analysis. using the quality-adjusted time without symptoms or toxicity (Q-TWiST) method, was applied to two randomized clinical trials conducted in patients with MM which compared randomized assignment to HDT vs. conventional chemotherapy (CCT) alone (MAG91) or followed by HDT (MAG90). Treatment benefit in terms of mean Q-TWiST was assessed through threshold utility analyses, i.e., sensitivity analyses of the choice of the utility coefficients over all possible values of utility weights.


RESULTS
In both trials, results slightly favored the first-line HDT group over the first-line CCT group, with an average gain in TWiST of about 5.5 months over the 58 month-median follow-up period (27.8 vs. 22.3 months, respectively) in the MAG90 trial and 5.8 months over the 56 month-median follow-up period (19.1 vs. 13.3 months, respectively) in the MAG91 trial. The utility threshold analyses revealed that the first-line HDT group had a statistically increased mean quality-of-life adjusted time compared to the other group for a broad range of utility coefficient values.


CONCLUSIONS
The development of such understandable and intuitive measures of expressing the relative benefit of complex treatment strategies is expected to be used in clinical decision making in the near future.
Porcher
R
R
Département de Biostatistique et Informatique Médicale, Hôpital Saint Louis, U444-INSERM, Université Paris, France. porcher@dbim.jussieu.fr
Lévy
V
V
Fermand
J P
JP
Katsahian
S
S
Chevret
S
S
Ravaud
Ph
P
D000970:Antineoplastic Agents / Q000008:administration & dosage*; D004305:Dose-Response Relationship, Drug; D005602:France; D006801:Humans; D008875:Middle Aged; D009101:Multiple Myeloma / Q000188:drug therapy*; D011788:Quality of Life; D019057:Quality-Adjusted Life Years
D000970:Antineoplastic Agents