Ranibizumab for treating choroidal neovascularisation associated with pathological myopia

Clinical effectiveness

4.5 The Committee considered the evidence presented by the manufacturer on the clinical effectiveness of ranibizumab. The Committee acknowledged that the evidence was primarily from RADIANCE, which compared ranibizumab with vPDT, and was complemented by evidence from 2 other randomised trials that compared ranibizumab with bevacizumab, even though the manufacturer did not present the data for the bevacizumab arms of these trials in its submission. The Committee noted that ranibizumab was associated with a greater improvement than vPDT in best corrected visual acuity (BCVA) between baseline and months 1–3. The Committee concluded that ranibizumab is a clinically effective treatment option for visual impairment caused by choroidal neovascularisation associated with pathological myopia.

4.6 The Committee discussed the primary end point of RADIANCE, which was the mean average change in BCVA between baseline and months 1–3. The Committee heard from the clinical specialist that 3 months was not a long time period to assess the longer term benefits of ranibizumab. However, the other studies of ranibizumab and the long‑term follow‑up of its use in other eye conditions suggest a sustained effect. The Committee concluded that, because the clinical effectiveness of ranibizumab was not compared with vPDT after 3 months in RADIANCE, there is uncertainty about the long‑term efficacy of ranibizumab for visual impairment caused by choroidal neovascularisation associated with pathological myopia.

4.7 The Committee considered the 2 trials presented in the manufacturer's submission that compared the use of ranibizumab and bevacizumab in choroidal neovascularisation associated with pathological myopia. The Committee noted that this was in line with the scope, in which bevacizumab was included as a comparator. The Committee heard from the clinical specialist that the 2 trials, although small, showed ranibizumab and bevacizumab to be equally effective. It was aware that the manufacturer presented only the results from the ranibizumab arms of these trials in their submission and that the Evidence Review Group (ERG) had presented the results from the bevacizumab arms in their report (see section 3.19). The Committee concluded that ranibizumab is likely to be as clinically effective as bevacizumab in patients with visual impairment caused by choroidal neovascularisation associated with pathological myopia.

4.8 The Committee considered the trial evidence for adverse events associated with ranibizumab. The Committee discussed whether geographic atrophy was under‑reported because markers of this effect were not measured in RADIANCE. The clinical specialist argued that there was no particular reason to expect geographic atrophy as a side effect of ranibizumab treatment. The Committee was aware that the main adverse events listed in the summary of product characteristics were eye pain, ocular hyperaemia, increased intraocular pressure, vitritis, and vitreous detachment. The Committee agreed that the evidence suggested manageable adverse events with ranibizumab, and concluded that ranibizumab was safe and well tolerated in patients with visual impairment caused by choroidal neovascularisation associated with pathological myopia.

Cost effectiveness

4.9 The Committee considered the cost‑effectiveness evidence presented in the manufacturer's submission, including the base‑case results, the sensitivity and scenario analyses and the ERG's critique of the manufacturer's evidence. It noted that the manufacturer had not included bevacizumab as a comparator in its economic model. The Committee understood that the manufacturer's base‑case analysis showed that ranibizumab dominated vPDT (that is, it was more effective and less costly), resulting in more quality‑adjusted life years (QALYs; 13.18 compared with 12.75) and lower costs (£9694 compared with £12,455).

4.10 The Committee accepted the model structure, but was concerned by some of the uncertainties about the assumptions used by the manufacturer. In particular, the Committee queried:

4.11 The Committee considered the clinical‑effectiveness data that were used in the manufacturer's economic model. It recognised that the clinical‑effectiveness data for ranibizumab were derived from RADIANCE and the data for vPDT after 3 months were derived from the VIP trial. The Committee noted that there was a larger proportion of patients at baseline with subfoveal involvement in VIP compared with RADIANCE and it was concerned that this might have had an impact on the model. The Committee heard from the clinical specialist that an imbalance would only be clinically relevant if it was in the number of patients with extra‑foveal involvement, and that this did not appear to be the case. The Committee concluded that the imbalance in the number of patients with subfoveal involvement in RADIANCE and VIP was unlikely to have a large impact on the manufacturer's model.

4.12 The Committee discussed the manufacturer's assumption that the average BCVA gain at the end of year 1 would continue indefinitely. The Committee heard from the clinical specialist that data collected at the 3 time points in RADIANCE showed that the benefit of ranibizumab was maintained for at least 12 months. The Committee noted that the ERG's sensitivity analyses included different durations of treatment benefit, and that ranibizumab dominated vPDT even when the duration of treatment benefit was reduced to 1 year. The Committee concluded that the duration of treatment benefit was likely to be less than the manufacturer's assumption of an indefinite duration, and that ranibizumab dominated vPDT when the duration of effect was reduced.

4.13 The Committee discussed the manufacturer's assumption about the number of ranibizumab injections that people would receive in clinical practice. The Committee heard from the clinical specialist that, on average, patients only need ranibizumab injections in the first 3 months of their first year of treatment. The clinical specialist also stated that patients in the REPAIR trial had well preserved eyesight after 18 months and did not need further treatment. The Committee noted that the ERG had increased the number of ranibizumab injections in the second year of ranibizumab treatment from 1.0 to 1.7 in its exploratory analysis. Based on experience with patients using ranibizumab, the clinical specialist felt that this number could be too high. The Committee concluded that the number of injections included in the manufacturer's base case could be an underestimate and that even if the number of injections was increased, ranibizumab would continue to dominate vPDT.

4.14 The Committee considered the costs of blindness used in the manufacturer's economic model. It noted that the ERG presented lower costs of blindness in their report. The Committee heard from the ERG that the difference in the costs of blindness was mainly related to the way the costs for private residential care were calculated. The Committee noted that the manufacturer's sensitivity analysis showed that the model was not sensitive to changes in the costs of blindness. The Committee concluded that the ERG's assumptions about the costs of blindness were likely to be more realistic than those used by the manufacturer, and that if the ERG's assumptions had been used, ranibizumab would continue to dominate vPDT.

4.15 The Committee discussed the administration costs of ranibizumab used in the manufacturer's economic model. It noted that these costs were likely to be an underestimate of the true costs incurred in the NHS. The Committee recognised that the manufacturer's sensitivity analysis showed that the model was not sensitive to changes in the administration costs. The Committee concluded that although some uncertainty remained about the NHS costs involved in the administration of ranibizumab, the uncertainty was not great enough to affect the dominance of ranibizumab over vPDT.

4.16 The Committee discussed the mortality multipliers that the manufacturer had used in its economic model. It heard from the ERG that the source of some of the mortality multipliers was unclear. The ERG also stated that changing the mortality multipliers to alternative values had little impact on the cost savings or QALYs for ranibizumab. The Committee concluded that the manufacturer's rationale for some of the mortality multipliers used in their model was unclear, and that any changes to them were unlikely to change the dominance of ranibizumab over vPDT.

4.17 The Committee considered the method used in the manufacturer's economic model to account for the possibility of the treated eye changing from being the better‑seeing eye to being the worse‑seeing eye as patients changed health states. The Committee understood that the way the manufacturer had modelled this seemed to underestimate the changes in net QALY gains and costs of blindness that may arise from the more effective treatment. The Committee noted that it was not possible to quantify the size of the effect on the base‑case analysis. The Committee concluded that the modelling of the treated eye changing from being the better‑seeing eye to being the worse‑seeing eye as patients changed health states may have had an impact on the base‑case analysis, which showed that ranibizumab dominated vPDT, although the level of impact remained unclear.

4.18 The Committee discussed the utility values used in the manufacturer's economic model. The Committee noted that the source of utility data used in the base‑case analysis (Czoski‑Murray et al. 2009) was used in Ranibizumab for the treatment of diabetic macular oedema (NICE technology appraisal guidance 274), Ranibizumab for treating visual impairment caused by macular oedema secondary to retinal vein occlusion (NICE technology appraisal guidance 283), and Aflibercept solution for injection for treating wet age-related macular degeneration (NICE technology appraisal guidance 294). It was aware that EQ‑5D data were also collected in RADIANCE, but these data were not used in the model. The Committee heard from the manufacturer that the EQ‑5D data from RADIANCE were not included because the EQ‑5D is widely recognised as not being sensitive in studies of eye conditions. The Committee heard from the ERG that using the EQ‑5D data collected in RADIANCE did not have a large effect on the model, although the effect for the worse‑seeing eye was not clear. The Committee concluded that using the EQ‑5D data from RADIANCE was unlikely to change the overall results of the base‑case analysis and that ranibizumab would continue to dominate vPDT.

4.19 The Committee noted that the manufacturer's model had not included bevacizumab as a comparator and so the base‑case analysis was limited to a comparison of ranibizumab with vPDT. However, because the available evidence for bevacizumab in this indication was limited to 2 small trials (see section 4.4), there was currently insufficient evidence to allow bevacizumab to be included with confidence in a clinical and cost‑effectiveness analysis. The Committee considered the uncertainties in the manufacturer's model and noted that they did not have an effect on the overall results of the base‑case analysis, which showed that ranibizumab dominated vPDT. The Committee concluded that ranibizumab was a cost‑effective use of NHS resources for treating people with visual impairment caused by choroidal neovascularisation associated with pathological myopia when vPDT was the comparator.

4.20 The Committee discussed how innovative ranibizumab is in its potential to make a significant and substantial impact on health‑related benefits. It agreed that anti‑VEGF treatments, such as ranibizumab, were a substantial improvement over previous treatments, and considered that this improvement applied to the class of drugs, including bevacizumab. It stated that the innovation was a step forward in providing health‑related patient benefits, not the act of licensing. In addition there were no substantial benefits of ranibizumab over its comparators that were not already captured in the QALY estimation in the modelling.

4.21 The Committee discussed whether NICE's duties under the equalities legislation required it to alter or add to its recommendations in any way. No equality issues were raised during the appraisal process or at the Committee meeting. Therefore the Committee concluded that no alterations or additions to its recommendations were needed.

Summary of Appraisal Committee's key conclusions