Comparative characterization of OncoPro™ and Wnt-Based media reveals distinct phenotypic and pharmacologic states in patient-derived tumor organoids
- Christophe Deben
- Mar 18
- 2 min read
How culture medium shapes organoid phenotype and drug response
Patient-derived tumor organoids are becoming an increasingly important model for translational cancer research and drug screening. But one variable is often underestimated: the culture medium itself. In our recent preprint, Comparative characterization of OncoPro™ and Wnt-Based media reveals distinct phenotypic and pharmacologic states in patient-derived tumor organoids, we examined how two commonly used organoid culture strategies influence organoid behavior.
Across a panel of patient-derived tumor organoids, we found that OncoPro™ and Wnt-based media do not simply support growth in different ways, they can drive distinct biological states. Organoids grown in Wnt-based medium often showed a more cohesive, rounded, and smooth morphology, highlighting that medium composition can substantially affect phenotype.
Importantly, these differences extended beyond appearance. The study shows that culture conditions can also influence pharmacologic response, meaning that the medium used for organoid expansion and screening may directly affect how drug sensitivity data should be interpreted.
For organoid-based screening workflows, this has clear implications. Medium selection should not be treated as a purely technical detail, but as an important biological variable that can shape experimental outcome, reproducibility, and translational relevance. For the DrugVision.AI screening lab, this reinforces the importance of combining robust screening workflows with careful model optimization to generate meaningful phenotypic and drug response data.
Manuscript
Abstract
Background Patient-derived tumor organoids (PDTOs) are strongly influenced by culture medium. We compared OncoPro™ (OP) Tumoroid Culture medium with conventional Wnt/R-spondin medium (Wnt). This recently developed OP medium offers a standardized, serum-free alternative to Wnt-based formulations.
Methods We performed a comparison of OP and Wnt media across 36 PDTO lines from various malignancies. PDTOs were assessed for establishment success, morphology, transcriptomic profiles (bulk RNAseq and fidelity to public single cell (sc) RNAseq databases) and pharmacologic response to a 60-drug panel.
Results Adaptation to OP succeeded in 83% (15/18), whereas de novo establishment favored Wnt (44.4% vs 22.2%). Transcriptomic profiling revealed retained tumor-identity but with different epithelial states: Wnt upregulated proliferation/stemness-associated genes (e.g. LGR5) and OP enriched adhesion-associated genes and inflammatory/TGF-β programs. In scRNA databases OP signatures preferentially mapped to malignant epithelial compartments in pancreatic cancer, whereas Wnt signatures were linked to non-malignant epithelium. In colon cancer OP signature was correlated with the malignant iCMS3 subtype. Drug screening demonstrated consistent medium-dependent shifts: Wnt-grown organoids were globally more sensitive, particularly to MAPK-axis inhibitors and apoptosis-sensitizers, while OP-grown organoids exhibited relative resistance
Conclusions Culture medium composition is a key determinant of PDTO phenotype, transcriptome and drug sensitivity. Wnt supports proliferation-associated genes and drug-sensitive states; OP induces adhesion-associated genes and inflammatory-related programs, with broader resistance and high fidelity of the transcriptomic signature in public scRNAseq databases of colon- and pancreatic cancer.
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