# Screening date metadata

**URL:** <https://forum.depmap.org/t/screening-date-metadata/4394>\
**Category:** Q&A\
**Created:** [August 5, 2025, 4:24pm UTC](https://forum.depmap.org/t/screening-date-metadata/4394 "2025-08-05T16:24:22Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![lough](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.depmap.org/lough/32/1582_2.png) [@lough](https://forum.depmap.org/u/lough)\
**Post date:** [August 5, 2025, 4:24pm UTC](https://forum.depmap.org/t/screening-date-metadata/4394/1 "2025-08-05T16:24:22Z")

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Hi,

Thanks for this resource. I’m working on a cancer evolution project aiming to analyse gene essentiality and drug sensitivity at certain genomic copy number states. However, as copy number states can evolve and disappear/backmutate rapidly, I need to get a sense of the delay between the time of sampling for copy number analysis (WES, using the PureCN 24Q4 absolute copy number data) and the date(s) of CRISPR/Achilles/drug sensitivity screening. Is it possible to find metadata with the (approximate) dates of WES and sensitivity screening for each cell line? Or is there a general sense of how far apart these were?