CLINICAL PHARMACOLOGY
Mechanism Of Action
Corticosteroids inhibit inflammatory responses to a variety of inciting agents including multiple inflammatory cytokines. They inhibit edema, fibrin deposition, capillary dilation, leukocyte migration, capillary proliferation, fibroblast proliferation, deposition of collagen, and scar formation associated with inflammation.
Corticosteroids are thought to act by inhibition of phospholipase A2 via induction of inhibitory proteins collectively called lipocortins. It is postulated that these proteins control biosynthesis of potent mediators of inflammation such as prostaglandins and leukotrienes by inhibiting release of the common precursor, arachidonic acid. Arachidonic acid is released from membrane phospholipids by phospholipase A2.
Pharmacokinetics
In a human pharmacokinetic study of ILUVIEN, fluocinolone acetonide concentrations in plasma were below the lower limit of quantitation of the assay (100 pg/mL) at all post-administration time points from Day 7 through Month 36 following intravitreal administration of a 0.2 mcg/day or 0.5 mcg/day fluocinolone acetonide insert.
Clinical Studies
The efficacy of ILUVIEN was assessed in two three year, randomized (2:1, active: sham), multicenter, double-masked, parallel-groups studies that enrolled patients with diabetic macular edema (DME) that had previously been treated with laser photocoagulation.
The primary efficacy endpoint in both trials was the proportion of subjects in whom vision had improved by 15 letters or more from baseline after 24 months of follow-up.
Table 3: Baseline BCVA (Letters)
|
Study 1 |
Study 2 |
ILUVIEN (N=190) |
Sham (N=95) |
ILUVIEN (N=186) |
Sham (N=90) |
Mean (SD) |
53 (13) |
55 (11) |
53 (12) |
55 (11) |
Median (Range) |
57 (19-75) |
58 (25-69) |
56 (20-70) |
58 (21-68) |
Table 4: Visual Acuity outcomes at Month 24 (All randomized subjects with LOCF)
Study |
Outcomes |
ILUVIEN |
Sham |
Estimated Difference (95% CI) |
1a |
Gain of ≥15 letters in BCVA (n (%)) |
51 (27%) |
14 (15%) |
12.1% (2.6%, 21.6%) |
Loss of ≥15 letters in BCVA (n (%)) |
26 (14%) |
5 (5%) |
8.4% (1.8%, 15.1%) |
Mean change from baseline in BCVA (SD) |
3.7 (18.7) |
3.2 (13.1) |
1.8 (-2.8, 6.3) |
2b |
Gain of ≥15 letters in BCVA (n (%)) |
57 (31%) |
16 (18%) |
13.0% (2.7%, 23.4%) |
Loss of ≥15 letters in BCVA (n (%)) |
22 (12%) |
9 (10%) |
1.8% (-5.9%, 9.6%) |
Mean change from baseline in BCVA (SD) |
5.2 (18.0) |
0.0 (15.6) |
6.1 (1.4, 10.8) |
aStudy 1: ILUVIEN, N=190; Sham, N=95
bStudy 2: ILUVIEN, N=186; Sham, N=90 |
Visual acuity outcomes by lens status (Phakic or Pseudophakic) at different visits are presented in Figure 2 and Figure 3. The occurrence of cataracts impacted visual acuity during the study. Patients who were pseudophakic at baseline achieved greater mean BCVA change from baseline at the Month 24 study visit.
Figure 2: Proportion of subjects with >=15 Letters Improvement from Baseline BCVA in the Study Eye
Figure 3: Mean BCVA Change from Baseline
The BCVA outcomes for the Pseudophakic and Phakic subgroups from Studies 1 and 2 at Month 24 are presented in Table 5.
Table 5: Visual Acuity outcomes at Month 24 (Subgroup for pooled data with LOCF)
Lens Status |
Outcomes |
ILUVIEN |
Sham |
Estimated Difference (95% CI) |
aPseudophakic |
Gain of ≥15 letters in BCVA (n (%)) |
39 (28%) |
8 (13%) |
15.4% (4.4%, 26.3%) |
Loss of ≥15 letters in BCVA (n (%)) |
7 (5%) |
7 (11%) |
-5.9% (-14.4%, 2.5%) |
Mean change from baseline in BCVA (SD) |
7.1 (14.5) |
1.5 (17.4) |
5.6 (0.7, 10.6) |
bPhakic |
Gain of ≥15 letters in BCVA (n (%)) |
69 (29%) |
22 (18%) |
11.1% (2.1%, 20.1%) |
Loss of ≥15 letters in BCVA (n (%)) |
41 (17%) |
7 (6%) |
11.6% (5.2%, 18%) |
Mean change from baseline in BCVA (SD) |
2.8 (20.1) |
1.8 (12.6) |
1 (-2.5 ,4.4) |
aPseudophakic : ILUVIEN, N=140; Sham, N=64
bPhakic: ILUVIEN, N=236; Sham, N=121 |