Fourier Transform Near-Infrared Spectrometry Reveals Significant Inter-Lot Variability in Thyrotropin Alfa...

Area of Science:

• Biochemistry
• Analytical Chemistry
• Pharmaceutical Science

Background:

• Thyrotropin alfa is a recombinant glycoprotein and a purified form of human thyroid stimulating hormone (TSH).
• It is produced using recombinant DNA technology in genetically modified Chinese hamster ovary (CHO) cells.
• The drug is supplied as a lyophilized product for intramuscular administration.

Purpose of the Study:

• To assess the spectral consistency of thyrotropin alfa within and between manufacturing lots.
• To identify potential variations in drug product quality using near-infrared (NIR) spectroscopy.
• To investigate if spectral differences correlate with drug stability and efficacy.

Main Methods:

• Intralot and interlot analysis of thyrotropin alfa vials using near-infrared (NIR) spectroscopy.
• Multivariate analysis of spectral data to identify outliers and variability.
• Comparison of spectral plots across different wavenumber regions.

Main Results:

• Significant spectral differences were observed within a single manufacturing lot (EY0155), with 25% of vials flagged as outliers.
• Interlot analysis of 171 vials from 18 lots revealed considerable variability in NIR absorption profiles.
• Specific wavenumber regions (e.g., 4000-5000 cm⁻¹, 5150 cm⁻¹, 5900 cm⁻¹, 6650 cm⁻¹) showed notable differences, potentially related to moisture content and peak ratios.

Conclusions:

• Substantial spectral variability exists in thyrotropin alfa products, both within and between manufacturing lots.
• These observed spectral differences may have implications for the drug's stability and therapeutic efficacy.
• Further investigation is warranted to understand the clinical significance of these variations.