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Rivaroxaban for the treatment of deep vein thrombosis and ...

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Subgroup analyses – EINSTEIN-Ext<br />

Subgroup analyses <strong>of</strong> <strong>the</strong>se studies are subject to <strong>the</strong> same cautions as outlined <strong>for</strong> <strong>the</strong> EINSTEIN-<br />

DVT analyses, <strong>for</strong> example, in terms <strong>of</strong> powering. Only two subgroup analyses st<strong>and</strong> out (Figure 10,<br />

page 58, 1 reproduced here as Figure 6): a seemingly increased advantage <strong>for</strong> those who are over 75<br />

years <strong>of</strong> age, <strong>and</strong> those who are over 90kg in weight <strong>and</strong> were treated with rivaroxaban. In part this<br />

appears to contradict <strong>the</strong> results <strong>of</strong> <strong>the</strong> EINSTEIN-DVT trial, where increased weight leads to an<br />

apparent reduction in efficacy. On <strong>the</strong> o<strong>the</strong>r h<strong>and</strong>, EINSTEIN-DVT subgroup analyses also revealed a<br />

similar trend towards increasing benefit with increasing age.<br />

Figure 6: Analysis <strong>of</strong> VTE recurrence (primary efficacy outcome) across <strong>the</strong> pre-specified<br />

subgroups in EINSTEIN-Ext (reproduction <strong>of</strong> Figure 10, page 58 <strong>of</strong> MS) 1<br />

No fur<strong>the</strong>r studies were identified by <strong>the</strong> ERG.<br />

4.3 Critique <strong>of</strong> trials identified <strong>and</strong> included in <strong>the</strong> indirect comparison <strong>and</strong>/or multiple<br />

<strong>treatment</strong> comparison<br />

The multiple <strong>treatment</strong> comparison (MTC) included <strong>the</strong> five trials listed in Table 15. Its aim was to<br />

allow a comparison <strong>of</strong> rivaroxaban to LMWH in <strong>the</strong> cancer subgroup <strong>of</strong> patients. The included studies<br />

were taken from a recent Cochrane review completed by Akl et al. 31<br />

70<br />

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