This spring, the long-running British dance duo Simian Mobile Disco will producer Murmurations, their latest album. Unfortunately, though, they won’t be able to tour behind the album. Mixmag reports that Jas Shaw, one half of the duo, is going to be undergoing chemotherapy treatment for a rare disease called AL amyloidosis.

AL amyloidosis, which usually affects older people, is a bone marrow disorder. The disease, which has no cure, results in a buildup of a substance called amyloid on internal organs. It can affect all the important ones, and severe AL amyloidosis can lead to life-threatening organ failure. Shaw has already begun his chemotherapy treatment.

The duo have decided that they will play one of their scheduled dates, their 4/4 show at the Barbican in London. (At least, according to Shaw, there’s a “good chance” that he can play that show.) Proceeds from that show will now go to benefit the UCL amyloidosis research fund. But SMD will have to delay their planned American tour for “at least a few months,” according to a statement from the group. On Twitter, Shaw writes, “I’m still getting my head around it and don’t know how things are going to progress but it turns out that the people that I know are lovely and have been very supportive.”

Here’s the statement from the duo:

pic.twitter.com/5NQKmcBx5D

— Simian Mobile Disco (@smdisco) March 26, 2018

And here’s Shaw writing about it on Twitter:

Because the majority of you lot on here are people I’ve met I thought I’d do a message to go along with the one that’s on the smd feed.
I’ve been diagnosed with AL Amyloidosis, started chemo last Thursday.

— Jas shaw (@Jas_shaw) March 26, 2018

I’m still getting my head around it and don’t know how things are going to progress but it turns out that the people that I know are lovely and have been very supportive. Thanks.

— Jas shaw (@Jas_shaw) March 26, 2018

There’s loads of people who I would rather have told directly than have them find out on here but at the moment I just don’t have it in me to have that conversation that many times.

— Jas shaw (@Jas_shaw) March 26, 2018

Thanks to everyone who’s got in touch, it’s appreciated. Rather than repeat myself I’ll just add that I’m coping with chemo pretty well so far and look forward to a time when I can have breakfast before bed, I do miss it.

— Jas shaw (@Jas_shaw) March 27, 2018

Treatment is on Thursdays so I think I’ve got a good chance of being well enough to do the Barbican show. James has been doing all the prep for this, rehearsing with the choir, pre-production meetings. He’s on his way to mine now so we can rehearse. He’s making it possible.

— Jas shaw (@Jas_shaw) March 27, 2018