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HTS384 NCI60: The Next Phase of the NCI60 Screen.

Cancer Research 2024 June 12
The NCI60 human tumor cell line screen has been in operation as a service to the cancer research community for over 30 years. The screen operated with 96-well plates, a 2-day exposure period to test agents, and, following cell fixation, a visible absorbance endpoint by the protein-staining dye sulforhodamine B. Here, we describe the next phase of this important cancer research tool, the HTS384 NCI60 screen. While the cell lines remain the same, the updated screen is performed with 384-well plates, a 3-day exposure period to test agents, and a luminescent endpoint to measure cell viability based upon cellular ATP content. In this study, a library of 1003 FDA-approved and investigational small molecule anticancer agents was screened by the two NCI60 assays. The datasets were compared with a focus on targeted agents with at least six representatives in the library. For many agents, including inhibitors of EGFR, BRAF, MEK, ERK, and PI3K, the patterns of GI50 values were very similar between the screens with strong correlations between those patterns within the dataset from each screen. However, for some groups of targeted agents, including mTOR, BET bromodomain, and NAMPRTase inhibitors, there were limited or no correlations between the two datasets, although the patterns of GI50 values and correlations between those patterns within each dataset were apparent. Beginning in January 2024, the HTS384 NCI60 screen became the free screening service of the National Cancer Institute to facilitate drug discovery by the cancer research community.

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