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When Unsuspected Crystallinity Ruins Biological Testing in Early Discovery: A Case Study.

Claudi de Rocafiguera1, Blanca Belsa1, Mercè Font-Bardia2

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Summary

Drug solid-state form impacts solubility and biological activity. Unexpected crystallinity in a tyrosine kinase inhibitor led to a false negative in biological testing, highlighting the need for early consideration of solid-state properties in drug discovery.

Keywords:
biological activitycrystallinitysolubility

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Area of Science:

  • Pharmaceutical Sciences
  • Medicinal Chemistry
  • Drug Discovery and Development

Background:

  • Solid-state properties like crystallinity significantly influence drug solubility and pharmacokinetics.
  • The pharmaceutical industry routinely considers solid-state form during drug development.
  • Early-stage drug discovery, especially in academia, often overlooks the impact of solid-state structure.

Purpose of the Study:

  • To highlight the critical importance of considering solid-state properties early in drug discovery.
  • To present a case study of a false negative result due to unexpected drug crystallinity.
  • To investigate the discrepancy in biological testing between crystalline and amorphous forms of a drug candidate.

Main Methods:

  • Comparative analysis of crystalline and amorphous batches of a tyrosine kinase inhibitor.
  • Assessment of solubility differences between the two solid-state forms.
  • Biological testing to evaluate the impact of crystallinity on drug efficacy.

Main Results:

  • The crystalline form of the tyrosine kinase inhibitor exhibited lower solubility compared to its amorphous counterpart.
  • This solubility difference led to a false negative outcome in biological testing for the crystalline sample.
  • Experimentation confirmed crystallinity as the origin of the observed discrepancy.

Conclusions:

  • Unexpected drug crystallinity can lead to erroneous conclusions in early biological assessments.
  • Early consideration of solid-state properties is crucial for accurate drug discovery and development.
  • Integrating solid-state characterization early can prevent costly late-stage failures.