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1. Supplementary Figures 1-4 from Preclinical Pharmacology, Antitumor Activity, and Development of Pharmacodynamic Markers for the Novel, Potent AKT Inhibitor CCT128930

Author

Yap, Timothy A., primary, Walton, Mike I., primary, Hunter, Lisa-Jane K., primary, Valenti, Melanie, primary, de Haven Brandon, Alexis, primary, Eve, Paul D., primary, Ruddle, Ruth, primary, Heaton, Simon P., primary, Henley, Alan, primary, Pickard, Lisa, primary, Vijayaraghavan, Gowri, primary, Caldwell, John J., primary, Thompson, Neil T., primary, Aherne, Wynne, primary, Raynaud, Florence I., primary, Eccles, Suzanne A., primary, Workman, Paul, primary, Collins, Ian, primary, and Garrett, Michelle D., primary

Published
2023
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2. Supplementary Table 5A from AT13148 Is a Novel, Oral Multi-AGC Kinase Inhibitor with Potent Pharmacodynamic and Antitumor Activity

Author

Yap, Timothy A., primary, Walton, Mike I., primary, Grimshaw, Kyla M., primary, te Poele, Robert H., primary, Eve, Paul D., primary, Valenti, Melanie R., primary, de Haven Brandon, Alexis K., primary, Martins, Vanessa, primary, Zetterlund, Anna, primary, Heaton, Simon P., primary, Heinzmann, Kathrin, primary, Jones, Paul S., primary, Feltell, Ruth E., primary, Reule, Matthias, primary, Woodhead, Steven J., primary, Davies, Thomas G., primary, Lyons, John F., primary, Raynaud, Florence I., primary, Eccles, Suzanne A., primary, Workman, Paul, primary, Thompson, Neil T., primary, and Garrett, Michelle D., primary

Published
2023
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3. Supplementary Figure 5 from CCT244747 Is a Novel Potent and Selective CHK1 Inhibitor with Oral Efficacy Alone and in Combination with Genotoxic Anticancer Drugs

Author

Walton, Mike I., primary, Eve, Paul D., primary, Hayes, Angela, primary, Valenti, Melanie R., primary, De Haven Brandon, Alexis K., primary, Box, Gary, primary, Hallsworth, Albert, primary, Smith, Elizabeth L., primary, Boxall, Kathy J., primary, Lainchbury, Michael, primary, Matthews, Thomas P., primary, Jamin, Yann, primary, Robinson, Simon P., primary, Aherne, G. Wynne, primary, Reader, John C., primary, Chesler, Louis, primary, Raynaud, Florence I., primary, Eccles, Suzanne A., primary, Collins, Ian, primary, and Garrett, Michelle D., primary

Published
2023
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4. Supplementary Table 6A from AT13148 Is a Novel, Oral Multi-AGC Kinase Inhibitor with Potent Pharmacodynamic and Antitumor Activity

Author

Yap, Timothy A., primary, Walton, Mike I., primary, Grimshaw, Kyla M., primary, te Poele, Robert H., primary, Eve, Paul D., primary, Valenti, Melanie R., primary, de Haven Brandon, Alexis K., primary, Martins, Vanessa, primary, Zetterlund, Anna, primary, Heaton, Simon P., primary, Heinzmann, Kathrin, primary, Jones, Paul S., primary, Feltell, Ruth E., primary, Reule, Matthias, primary, Woodhead, Steven J., primary, Davies, Thomas G., primary, Lyons, John F., primary, Raynaud, Florence I., primary, Eccles, Suzanne A., primary, Workman, Paul, primary, Thompson, Neil T., primary, and Garrett, Michelle D., primary

Published
2023
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5. Supplementary Figure 3 from CCT244747 Is a Novel Potent and Selective CHK1 Inhibitor with Oral Efficacy Alone and in Combination with Genotoxic Anticancer Drugs

Author

Walton, Mike I., primary, Eve, Paul D., primary, Hayes, Angela, primary, Valenti, Melanie R., primary, De Haven Brandon, Alexis K., primary, Box, Gary, primary, Hallsworth, Albert, primary, Smith, Elizabeth L., primary, Boxall, Kathy J., primary, Lainchbury, Michael, primary, Matthews, Thomas P., primary, Jamin, Yann, primary, Robinson, Simon P., primary, Aherne, G. Wynne, primary, Reader, John C., primary, Chesler, Louis, primary, Raynaud, Florence I., primary, Eccles, Suzanne A., primary, Collins, Ian, primary, and Garrett, Michelle D., primary

Published
2023
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6. Supplementary Figure 4 from CCT244747 Is a Novel Potent and Selective CHK1 Inhibitor with Oral Efficacy Alone and in Combination with Genotoxic Anticancer Drugs

Author

Walton, Mike I., primary, Eve, Paul D., primary, Hayes, Angela, primary, Valenti, Melanie R., primary, De Haven Brandon, Alexis K., primary, Box, Gary, primary, Hallsworth, Albert, primary, Smith, Elizabeth L., primary, Boxall, Kathy J., primary, Lainchbury, Michael, primary, Matthews, Thomas P., primary, Jamin, Yann, primary, Robinson, Simon P., primary, Aherne, G. Wynne, primary, Reader, John C., primary, Chesler, Louis, primary, Raynaud, Florence I., primary, Eccles, Suzanne A., primary, Collins, Ian, primary, and Garrett, Michelle D., primary

Published
2023
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7. Supplementary Figure Legend from CCT244747 Is a Novel Potent and Selective CHK1 Inhibitor with Oral Efficacy Alone and in Combination with Genotoxic Anticancer Drugs

Author

Walton, Mike I., primary, Eve, Paul D., primary, Hayes, Angela, primary, Valenti, Melanie R., primary, De Haven Brandon, Alexis K., primary, Box, Gary, primary, Hallsworth, Albert, primary, Smith, Elizabeth L., primary, Boxall, Kathy J., primary, Lainchbury, Michael, primary, Matthews, Thomas P., primary, Jamin, Yann, primary, Robinson, Simon P., primary, Aherne, G. Wynne, primary, Reader, John C., primary, Chesler, Louis, primary, Raynaud, Florence I., primary, Eccles, Suzanne A., primary, Collins, Ian, primary, and Garrett, Michelle D., primary

Published
2023
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8. Supplementary Figures 1-7, Tables 1-4 from AT13148 Is a Novel, Oral Multi-AGC Kinase Inhibitor with Potent Pharmacodynamic and Antitumor Activity

Author

Yap, Timothy A., primary, Walton, Mike I., primary, Grimshaw, Kyla M., primary, te Poele, Robert H., primary, Eve, Paul D., primary, Valenti, Melanie R., primary, de Haven Brandon, Alexis K., primary, Martins, Vanessa, primary, Zetterlund, Anna, primary, Heaton, Simon P., primary, Heinzmann, Kathrin, primary, Jones, Paul S., primary, Feltell, Ruth E., primary, Reule, Matthias, primary, Woodhead, Steven J., primary, Davies, Thomas G., primary, Lyons, John F., primary, Raynaud, Florence I., primary, Eccles, Suzanne A., primary, Workman, Paul, primary, Thompson, Neil T., primary, and Garrett, Michelle D., primary

Published
2023
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9. Supplementary Table 1 from CCT244747 Is a Novel Potent and Selective CHK1 Inhibitor with Oral Efficacy Alone and in Combination with Genotoxic Anticancer Drugs

Author

Walton, Mike I., primary, Eve, Paul D., primary, Hayes, Angela, primary, Valenti, Melanie R., primary, De Haven Brandon, Alexis K., primary, Box, Gary, primary, Hallsworth, Albert, primary, Smith, Elizabeth L., primary, Boxall, Kathy J., primary, Lainchbury, Michael, primary, Matthews, Thomas P., primary, Jamin, Yann, primary, Robinson, Simon P., primary, Aherne, G. Wynne, primary, Reader, John C., primary, Chesler, Louis, primary, Raynaud, Florence I., primary, Eccles, Suzanne A., primary, Collins, Ian, primary, and Garrett, Michelle D., primary

Published
2023
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10. Supplementary Table 2 from CCT244747 Is a Novel Potent and Selective CHK1 Inhibitor with Oral Efficacy Alone and in Combination with Genotoxic Anticancer Drugs

Author

Walton, Mike I., primary, Eve, Paul D., primary, Hayes, Angela, primary, Valenti, Melanie R., primary, De Haven Brandon, Alexis K., primary, Box, Gary, primary, Hallsworth, Albert, primary, Smith, Elizabeth L., primary, Boxall, Kathy J., primary, Lainchbury, Michael, primary, Matthews, Thomas P., primary, Jamin, Yann, primary, Robinson, Simon P., primary, Aherne, G. Wynne, primary, Reader, John C., primary, Chesler, Louis, primary, Raynaud, Florence I., primary, Eccles, Suzanne A., primary, Collins, Ian, primary, and Garrett, Michelle D., primary

Published
2023
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11. Supplementary Table 1 from The Preclinical Pharmacology and Therapeutic Activity of the Novel CHK1 Inhibitor SAR-020106

Author

Walton, Michael I., primary, Eve, Paul D., primary, Hayes, Angela, primary, Valenti, Melanie, primary, De Haven Brandon, Alexis, primary, Box, Gary, primary, Boxall, Kathy J., primary, Aherne, G. Wynne, primary, Eccles, Suzanne A., primary, Raynaud, Florence I., primary, Williams, David H., primary, Reader, John C., primary, Collins, Ian, primary, and Garrett, Michelle D., primary

Published
2023
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12. Supplementary Tables 3 - 6 from CCT244747 Is a Novel Potent and Selective CHK1 Inhibitor with Oral Efficacy Alone and in Combination with Genotoxic Anticancer Drugs

Author

Walton, Mike I., primary, Eve, Paul D., primary, Hayes, Angela, primary, Valenti, Melanie R., primary, De Haven Brandon, Alexis K., primary, Box, Gary, primary, Hallsworth, Albert, primary, Smith, Elizabeth L., primary, Boxall, Kathy J., primary, Lainchbury, Michael, primary, Matthews, Thomas P., primary, Jamin, Yann, primary, Robinson, Simon P., primary, Aherne, G. Wynne, primary, Reader, John C., primary, Chesler, Louis, primary, Raynaud, Florence I., primary, Eccles, Suzanne A., primary, Collins, Ian, primary, and Garrett, Michelle D., primary

Published
2023
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13. Supplementary Methods, Figure Legends 1-7 from AT13148 Is a Novel, Oral Multi-AGC Kinase Inhibitor with Potent Pharmacodynamic and Antitumor Activity

Author

Yap, Timothy A., primary, Walton, Mike I., primary, Grimshaw, Kyla M., primary, te Poele, Robert H., primary, Eve, Paul D., primary, Valenti, Melanie R., primary, de Haven Brandon, Alexis K., primary, Martins, Vanessa, primary, Zetterlund, Anna, primary, Heaton, Simon P., primary, Heinzmann, Kathrin, primary, Jones, Paul S., primary, Feltell, Ruth E., primary, Reule, Matthias, primary, Woodhead, Steven J., primary, Davies, Thomas G., primary, Lyons, John F., primary, Raynaud, Florence I., primary, Eccles, Suzanne A., primary, Workman, Paul, primary, Thompson, Neil T., primary, and Garrett, Michelle D., primary

Published
2023
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14. Supplementary Figure 2 from CCT244747 Is a Novel Potent and Selective CHK1 Inhibitor with Oral Efficacy Alone and in Combination with Genotoxic Anticancer Drugs

Author

Walton, Mike I., primary, Eve, Paul D., primary, Hayes, Angela, primary, Valenti, Melanie R., primary, De Haven Brandon, Alexis K., primary, Box, Gary, primary, Hallsworth, Albert, primary, Smith, Elizabeth L., primary, Boxall, Kathy J., primary, Lainchbury, Michael, primary, Matthews, Thomas P., primary, Jamin, Yann, primary, Robinson, Simon P., primary, Aherne, G. Wynne, primary, Reader, John C., primary, Chesler, Louis, primary, Raynaud, Florence I., primary, Eccles, Suzanne A., primary, Collins, Ian, primary, and Garrett, Michelle D., primary

Published
2023
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15. Supplementary Figure 1 from CCT244747 Is a Novel Potent and Selective CHK1 Inhibitor with Oral Efficacy Alone and in Combination with Genotoxic Anticancer Drugs

Author

Walton, Mike I., primary, Eve, Paul D., primary, Hayes, Angela, primary, Valenti, Melanie R., primary, De Haven Brandon, Alexis K., primary, Box, Gary, primary, Hallsworth, Albert, primary, Smith, Elizabeth L., primary, Boxall, Kathy J., primary, Lainchbury, Michael, primary, Matthews, Thomas P., primary, Jamin, Yann, primary, Robinson, Simon P., primary, Aherne, G. Wynne, primary, Reader, John C., primary, Chesler, Louis, primary, Raynaud, Florence I., primary, Eccles, Suzanne A., primary, Collins, Ian, primary, and Garrett, Michelle D., primary

Published
2023
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21. The clinical development candidate CCT245737 is an orally active CHK1 inhibitor with preclinical activity in RAS mutant NSCLC and Eμ-MYC driven B-cell lymphoma

Author

Walton, Mike I., Eve, Paul D., Hayes, Angela, Henley, Alan T., Valenti, Melanie R., De Haven Brandon, Alexis K., Box, Gary, Boxall, Kathy J., Tall, Matthew, Swales, Karen, Matthews, Thomas P., McHardy, Tatiana, Lainchbury, Michael, Osborne, James, Hunter, Jill E., Perkins, Neil D., Aherne, G. Wynne, Reader, John C., Raynaud, Florence I., Eccles, Suzanne A., Collins, Ian, and Garrett, Michelle D.

Subjects
Lung Neoplasms, Lymphoma, B-Cell, CHK1, Mice, Nude, Apoptosis, Mice, Transgenic, Irinotecan, environment and public health, CCT245737, Deoxycytidine, Proto-Oncogene Proteins c-myc, Proto-Oncogene Proteins p21(ras), Mice, Carcinoma, Non-Small-Cell Lung, Cell Line, Tumor, Antineoplastic Combined Chemotherapy Protocols, CDC2 Protein Kinase, Animals, Humans, antitumor activity, 4-Aminopyridine, Mice, Inbred BALB C, biomarker assay, Drug Synergism, Cell Cycle Checkpoints, Xenograft Model Antitumor Assays, Gemcitabine, Cyclin-Dependent Kinases, enzymes and coenzymes (carbohydrates), Checkpoint Kinase 2, Pyrazines, Checkpoint Kinase 1, Camptothecin, biological phenomena, cell phenomena, and immunity, pharmacology, HT29 Cells, Research Paper, DNA Damage
Abstract

CCT245737 is the first orally active, clinical development candidate CHK1 inhibitor to be described. The IC50 was 1.4 nM against CHK1 enzyme and it exhibited1,000-fold selectivity against CHK2 and CDK1. CCT245737 potently inhibited cellular CHK1 activity (IC50 30-220 nM) and enhanced gemcitabine and SN38 cytotoxicity in multiple human tumor cell lines and human tumor xenograft models. Mouse oral bioavailability was complete (100%) with extensive tumor exposure. Genotoxic-induced CHK1 activity (pS296 CHK1) and cell cycle arrest (pY15 CDK1) were inhibited both in vitro and in human tumor xenografts by CCT245737, causing increased DNA damage and apoptosis. Uniquely, we show CCT245737 enhanced gemcitabine antitumor activity to a greater degree than for higher doses of either agent alone, without increasing toxicity, indicating a true therapeutic advantage for this combination. Furthermore, development of a novel ELISA assay for pS296 CHK1 autophosphorylation, allowed the quantitative measurement of target inhibition in a RAS mutant human tumor xenograft of NSCLC at efficacious doses of CCT245737. Finally, CCT245737 also showed significant single-agent activity against a MYC-driven mouse model of B-cell lymphoma. In conclusion, CCT245737 is a new CHK1 inhibitor clinical development candidate scheduled for a first in man Phase I clinical trial, that will use the novel pS296 CHK1 ELISA to monitor target inhibition.

Published
2015

22. Multiparameter Lead Optimization to Give an Oral Checkpoint Kinase 1 (CHK1) Inhibitor Clinical Candidate: (R)-5-((4-((Morpholin-2-ylmethyl)amino)-5-(trifluoromethyl)pyridin-2-yl)amino)pyrazine-2-carbonitrile (CCT245737)

Author

Osborne, James D., primary, Matthews, Thomas P., additional, McHardy, Tatiana, additional, Proisy, Nicolas, additional, Cheung, Kwai-Ming J., additional, Lainchbury, Michael, additional, Brown, Nathan, additional, Walton, Michael I., additional, Eve, Paul D., additional, Boxall, Katherine J., additional, Hayes, Angela, additional, Henley, Alan T., additional, Valenti, Melanie R., additional, De Haven Brandon, Alexis K., additional, Box, Gary, additional, Jamin, Yann, additional, Robinson, Simon P., additional, Westwood, Isaac M., additional, van Montfort, Rob L. M., additional, Leonard, Philip M., additional, Lamers, Marieke B. A. C., additional, Reader, John C., additional, Aherne, G. Wynne, additional, Raynaud, Florence I., additional, Eccles, Suzanne A., additional, Garrett, Michelle D., additional, and Collins, Ian, additional

Published
2016
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23. Discovery of 3-Alkoxyamino-5-(pyridin-2-ylamino)pyrazine-2-carbonitriles as Selective, Orally Bioavailable CHK1 Inhibitors

Author

Lainchbury, Michael, primary, Matthews, Thomas P., additional, McHardy, Tatiana, additional, Boxall, Kathy J., additional, Walton, Michael I., additional, Eve, Paul D., additional, Hayes, Angela, additional, Valenti, Melanie R., additional, de Haven Brandon, Alexis K., additional, Box, Gary, additional, Aherne, G. Wynne, additional, Reader, John C., additional, Raynaud, Florence I., additional, Eccles, Suzanne A., additional, Garrett, Michelle D., additional, and Collins, Ian, additional

Published
2012
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24. CCT244747 Is a Novel Potent and Selective CHK1 Inhibitor with Oral Efficacy Alone and in Combination with Genotoxic Anticancer Drugs

Author

Walton, Mike I., primary, Eve, Paul D., additional, Hayes, Angela, additional, Valenti, Melanie R., additional, De Haven Brandon, Alexis K., additional, Box, Gary, additional, Hallsworth, Albert, additional, Smith, Elizabeth L., additional, Boxall, Kathy J., additional, Lainchbury, Michael, additional, Matthews, Thomas P., additional, Jamin, Yann, additional, Robinson, Simon P., additional, Aherne, G. Wynne, additional, Reader, John C., additional, Chesler, Louis, additional, Raynaud, Florence I., additional, Eccles, Suzanne A., additional, Collins, Ian, additional, and Garrett, Michelle D., additional

Published
2012
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25. AT13148 Is a Novel, Oral Multi-AGC Kinase Inhibitor with Potent Pharmacodynamic and Antitumor Activity

Author

Yap, Timothy A., primary, Walton, Mike I., additional, Grimshaw, Kyla M., additional, te Poele, Robert H., additional, Eve, Paul D., additional, Valenti, Melanie R., additional, de Haven Brandon, Alexis K., additional, Martins, Vanessa, additional, Zetterlund, Anna, additional, Heaton, Simon P., additional, Heinzmann, Kathrin, additional, Jones, Paul S., additional, Feltell, Ruth E., additional, Reule, Matthias, additional, Woodhead, Steven J., additional, Davies, Thomas G., additional, Lyons, John F., additional, Raynaud, Florence I., additional, Eccles, Suzanne A., additional, Workman, Paul, additional, Thompson, Neil T., additional, and Garrett, Michelle D., additional

Published
2012
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26. Abstract 928: The novel clinical candidate AT13148 is an oral multi-AGC kinase inhibitor with potent pharmacodynamic and antitumor activity and demonstrates a mechanism of action distinct from AKT inhibitors

Author

Yap, Timothy A., primary, Walton, Michael I., additional, Grimshaw, Kyla M., additional, Poele, Robert H. te, additional, Eve, Paul D., additional, Valenti, Melanie R., additional, de Haven Brandon, Alexis K., additional, Martins, Vanessa, additional, Zetterlund, Anna, additional, Heaton, Simon P., additional, Heinzmann, Kathrin, additional, Jones, Paul S., additional, Feltell, Ruth E., additional, Reule, Matthias, additional, Woodhead, Steven J., additional, Davies, Thomas G., additional, Lyons, John F., additional, Raynaud, Florence I., additional, Eccles, Suzanne A., additional, Workman, Paul, additional, Thompson, Neil T., additional, and Garrett, Michelle D., additional

Published
2012
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27. Preclinical Pharmacology, Antitumor Activity, and Development of Pharmacodynamic Markers for the Novel, Potent AKT Inhibitor CCT128930

Author

Yap, Timothy A., primary, Walton, Mike I., additional, Hunter, Lisa-Jane K., additional, Valenti, Melanie, additional, de Haven Brandon, Alexis, additional, Eve, Paul D., additional, Ruddle, Ruth, additional, Heaton, Simon P., additional, Henley, Alan, additional, Pickard, Lisa, additional, Vijayaraghavan, Gowri, additional, Caldwell, John J., additional, Thompson, Neil T., additional, Aherne, Wynne, additional, Raynaud, Florence I., additional, Eccles, Suzanne A., additional, Workman, Paul, additional, Collins, Ian, additional, and Garrett, Michelle D., additional

Published
2011
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29. Abstract 3518: Preclinical pharmacology of the novel, potent & selective CHK1 inhibitor SAR-020106

Author

Walton, Michael I., primary, Eve, Paul D., additional, Hayes, Angela, additional, Valenti, Melanie, additional, Brandon, Alexis De Haven, additional, Box, Gary, additional, Aherne, G Wynne, additional, Eccles, Suzanne A., additional, Raynaud, Florence I., additional, Williams, David H., additional, Reader, John C., additional, Collins, Ian, additional, and Garrett, Michelle D., additional

Published
2010
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31. The Preclinical Pharmacology and Therapeutic Activity of the Novel CHK1 Inhibitor SAR-020106

Author

Walton, Michael I., primary, Eve, Paul D., additional, Hayes, Angela, additional, Valenti, Melanie, additional, De Haven Brandon, Alexis, additional, Box, Gary, additional, Boxall, Kathy J., additional, Aherne, G. Wynne, additional, Eccles, Suzanne A., additional, Raynaud, Florence I., additional, Williams, David H., additional, Reader, John C., additional, Collins, Ian, additional, and Garrett, Michelle D., additional

Published
2010
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33. The clinical development candidate CCT245737 is an orally active CHK1 inhibitor with preclinical activity in RAS mutant NSCLC and Eµ-MYC driven B-cell lymphoma.

Author

Walton MI, Eve PD, Hayes A, Henley AT, Valenti MR, De Haven Brandon AK, Box G, Boxall KJ, Tall M, Swales K, Matthews TP, McHardy T, Lainchbury M, Osborne J, Hunter JE, Perkins ND, Aherne GW, Reader JC, Raynaud FI, Eccles SA, Collins I, and Garrett MD

Subjects
4-Aminopyridine pharmacokinetics, 4-Aminopyridine pharmacology, Animals, Antineoplastic Combined Chemotherapy Protocols pharmacology, Apoptosis drug effects, CDC2 Protein Kinase, Camptothecin analogs & derivatives, Camptothecin pharmacology, Cell Cycle Checkpoints drug effects, Cell Line, Tumor, Checkpoint Kinase 1 metabolism, Checkpoint Kinase 2 antagonists & inhibitors, Cyclin-Dependent Kinases antagonists & inhibitors, DNA Damage drug effects, Deoxycytidine analogs & derivatives, Deoxycytidine pharmacology, Drug Synergism, HT29 Cells, Humans, Irinotecan, Mice, Mice, Inbred BALB C, Mice, Nude, Mice, Transgenic, Pyrazines pharmacokinetics, Gemcitabine, 4-Aminopyridine analogs & derivatives, Carcinoma, Non-Small-Cell Lung drug therapy, Checkpoint Kinase 1 drug effects, Lung Neoplasms drug therapy, Lymphoma, B-Cell drug therapy, Proto-Oncogene Proteins c-myc genetics, Proto-Oncogene Proteins p21(ras) genetics, Pyrazines pharmacology, Xenograft Model Antitumor Assays
Abstract

CCT245737 is the first orally active, clinical development candidate CHK1 inhibitor to be described. The IC50 was 1.4 nM against CHK1 enzyme and it exhibited>1,000-fold selectivity against CHK2 and CDK1. CCT245737 potently inhibited cellular CHK1 activity (IC50 30-220 nM) and enhanced gemcitabine and SN38 cytotoxicity in multiple human tumor cell lines and human tumor xenograft models. Mouse oral bioavailability was complete (100%) with extensive tumor exposure. Genotoxic-induced CHK1 activity (pS296 CHK1) and cell cycle arrest (pY15 CDK1) were inhibited both in vitro and in human tumor xenografts by CCT245737, causing increased DNA damage and apoptosis. Uniquely, we show CCT245737 enhanced gemcitabine antitumor activity to a greater degree than for higher doses of either agent alone, without increasing toxicity, indicating a true therapeutic advantage for this combination. Furthermore, development of a novel ELISA assay for pS296 CHK1 autophosphorylation, allowed the quantitative measurement of target inhibition in a RAS mutant human tumor xenograft of NSCLC at efficacious doses of CCT245737. Finally, CCT245737 also showed significant single-agent activity against a MYC-driven mouse model of B-cell lymphoma. In conclusion, CCT245737 is a new CHK1 inhibitor clinical development candidate scheduled for a first in man Phase I clinical trial, that will use the novel pS296 CHK1 ELISA to monitor target inhibition.

Published
2016
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