# What happened to the chromosome arm level copy number data

**URL:** https://forum.depmap.org/t/what-happened-to-the-chromosome-arm-level-copy-number-data/3927
**Category:** Report an Issue
**Created:** [January 28, 2025, 3:09pm UTC](https://forum.depmap.org/t/what-happened-to-the-chromosome-arm-level-copy-number-data/3927 "2025-01-28T15:09:32Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![Andrew\_Cherniack](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.depmap.org/andrew_cherniack/32/829_2.png) [@Andrew\_Cherniack](https://forum.depmap.org/u/Andrew_Cherniack)
#### Post date: [January 28, 2025, 3:09pm UTC](https://forum.depmap.org/t/what-happened-to-the-chromosome-arm-level-copy-number-data/3927/1 "2025-01-28T15:09:32Z")

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Hi  
The arm-level copy number data used to be in the Data Explorer, but now I can not find it anywhere, even in the download section. Can you tell me what happened to it?

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### Author: ![pmontgom](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.depmap.org/pmontgom/32/4_2.png) [@pmontgom](https://forum.depmap.org/u/pmontgom)
#### Post date: [January 28, 2025, 5:24pm UTC](https://forum.depmap.org/t/what-happened-to-the-chromosome-arm-level-copy-number-data/3927/2 "2025-01-28T17:24:31Z")

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Hello,

The arm-level copy number dataset was removed from data explorer in error with the 24Q4 update. Thanks for pointing this out – I’ll restore it this afternoon.

Regardless of it appearing in Data Explorer or not, you should still be able to find it in the download section. I went to the “All data” tab of the downloads section and used the search there and turned up the files:

 ![image](https://canada1.discourse-cdn.com/flex035/uploads/depmap/original/2X/0/0b47cbdedd7ee0216e9a378533c480473a7ce3af.png)

Here’s a direct link to the file set containing the files: [https://depmap.org/portal/data\_page/?tab=allData&releasename=CCLE+arm-level+CNAs](https://depmap.org/portal/data_page/?tab=allData&releasename=CCLE+arm-level+CNAs)

I’ll update once the public portal has this dataset visible in Data Explorer again.

Thanks again for letting us know it is missing from Data Explorer.

Thanks,  
Phil

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### Author: ![pmontgom](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.depmap.org/pmontgom/32/4_2.png) [@pmontgom](https://forum.depmap.org/u/pmontgom)
#### Post date: [January 28, 2025, 9:05pm UTC](https://forum.depmap.org/t/what-happened-to-the-chromosome-arm-level-copy-number-data/3927/3 "2025-01-28T21:05:47Z")

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The Arm-level CNA dataset has been added back to the portal.

 ![image](https://canada1.discourse-cdn.com/flex035/uploads/depmap/original/2X/c/c75cba6ed5e7268e7e8dc9549fba0abd2188a51e.png)

Thanks,  
Phil