Exctract from analysts presentation11 Sep 2018 14:23
So let's spend a few minutes focusing on the U.S. market today. Reported U.S. sales of respiratory products of approximately $23 billion in 2017 with nearly 65 million inhalers sold in the key DPI and pMDI maintenance classes. However, less than 1% of all sales for generic products -- they were less than 1% of all these sales were for generic products. And this is despite the fact that many of the underlying molecules in these products are long past their patent expiration.
As you know, one of the key classes currently in focus is the ICS/LABA class. In this area, the 2 main competitors, ADVAIR and SYMBICORT, have seen declines in sales values as they battle for market share and as they have attempted to build a buffer against generic entry. As you can see in this slide, evaluate pharma reported sales of $2.1 billion for ADVAIR and $1.1 billion for SYMBICORT in 2017, which is down from $2.5 billion and $1.2 billion, respectively, in 2016. While we see the declines in value, the underlying volume of the ICS/LABA market remained stable at 35.8 million units. We remain confident in the value of the market based on the margin and volume available for generic products to capture once approved and launched.
But our focus is not solely on VR315 or generic ADVAIR. Based on our experience, device and formulation expertise, we, along with partners, are well positioned to progress further generic products in the other current and emerging major classes in the inhaled respiratory space. Here, you can see the potential size of some of the products we believe Vectura is well positioned to progress. As James mentioned, the Ellipta range of products is estimated to be about GBP 3 billion by 2022. -- tiotropium for Boehringer is currently at GBP 1.8 billion and the combination LABA/LAMA is expected to be about GBP 0.6 billion by 2024. These products provide significant additional opportunity for our generics business moving forward.
So what progress are we making on the current and emerging GX development portfolio? On 315, we have already discussed the large market opportunity that remains despite the price erosion we've seen. With our partner Hikma, we are 1 of the 3 sponsors of programs under regulatory review. Recruitment is progressing on a key clinical study, and Hikma plans to submit data to the FDA in 2019, which could allow for potential launch in 2020.
In terms of other programs, we announced last year at our Capital Markets Day the licensing of our VR2081, a generic of an existing major inhaled combination therapy for asthma and COPD in the U.S. using a pMDI. The development work on that program is progressing in line with our expectations.
Our tiotropium program, VR410, that we licensed from -- is progressing with ongoing formulation and development work, and we will conclude our technical feasibility and commercial opportunity to review in the second half of this year and look forward to providing more information on that program once that work