Why ADCs Are a Bioanalytical Category of Their Own Antibody-drug conjugates (ADCs) are one of the most complex therapeutic modalities in the modern oncology pipeline. An ADC consists of a monoclonal antibody linked to a cytotoxic small molecule payload via a chemical linker. The three components are designed to work in concert: the antibody targets […]
Where Clinical Data Is Actually Lost In a well-designed clinical trial, the analytical plan, the bioanalytical methods, the statistical model, and the regulatory strategy all receive careful attention. What often receives less attention is the physical act of collecting, labelling, processing, and shipping the biological samples that all of that methodology depends on. Yet errors […]
Why Particle Size Matters for Oral Drug Absorption The Noyes-Whitney equation, a cornerstone of pharmaceutical dissolution science, tells us that the rate of dissolution of a solid is proportional to its surface area. Reducing the particle size of a poorly soluble API increases the surface area exposed to the dissolution medium, which increases the dissolution […]
Formulation Change Is Inevitable It is the rare pharmaceutical development programme that reaches Phase III with exactly the same formulation that entered Phase I. Scale-up changes, stability-driven modifications, bioavailability improvements, and the practical realities of manufacturing optimisation all result in formulation differences between the early clinical and the intended commercial product. This is not a […]
The Commercial Life of a Drug Molecule A new drug’s commercial life is bounded by its patent estate. The composition of matter patent, which covers the chemical structure of the active ingredient, is typically the most valuable piece of IP and is usually filed at or near the time of initial synthesis. By the time […]
Why Solid Form Characterisation Starts with XRPD X-ray powder diffraction (XRPD) is the most widely used technique for characterising the crystalline structure of pharmaceutical solids. Every crystalline form of a drug substance produces a unique diffraction pattern, a fingerprint determined by the arrangement of molecules in the crystal lattice. This fingerprint allows scientists to identify […]
CMC Strategy Is Not a Static Document There is a common misconception in early drug development that CMC strategy means writing a dossier. It does not. CMC strategy means making deliberate decisions, at every stage of development, about which data to generate, which manufacturing processes to lock, and how to position the product for the […]
The Stability Trade-Off at the Heart of ASD Formulation The physicochemical advantage of an amorphous solid dispersion is real and well-documented. By eliminating the crystal lattice energy barrier, amorphous forms dissolve faster and achieve higher apparent solubility in biological fluids. For BCS Class II molecules with poor oral bioavailability, this translates directly into better clinical […]
Why CMC Filings Slow Programmes Down The Common Technical Document (CTD) format is used for regulatory submissions across the major pharmaceutical markets. Module 3, the Quality section, contains the chemistry, manufacturing, and controls data for both the drug substance and the drug product. It is the section that drug developers frequently underestimate in terms of […]
The Solubility Problem in Modern Drug Development Estimates from published literature suggest that more than 70% of new chemical entities in development pipelines have poor aqueous solubility. Many of these fall into BCS Class II (low solubility, high permeability) or Class IV (low solubility, low permeability) under the Biopharmaceutics Classification System. For these molecules, getting […]
Two Strategies for the Same Problem Poor aqueous solubility is one of the most common challenges in small molecule drug development. A molecule that does not dissolve adequately in the gastrointestinal fluid cannot be absorbed at a rate sufficient to achieve the intended therapeutic effect, regardless of how potent it is in a biochemical assay. […]
Why the First Crystal Form Is Rarely the Right One When a medicinal chemist synthesises a new active pharmaceutical ingredient for the first time, the crystal form that precipitates out of solution is a function of the solvent system, the temperature, and the rate of crystallisation used. It is rarely the thermodynamically stable form, and […]
