Cellular composition and the interpretation of candidate RNA readouts of trogocytosis in colorectal cancer

In 62 colorectal cancer patients (GSE178341), an eight-gene trogocytosis candidate module correlates with T-cell fraction (ρ=0.767), but this strength matches 10,000 matched-module nulls.

• Why it matters: RNA readouts tied to trogocytosis can instead track cellular composition, risking misinterpretation of membrane-transfer events.
• What they did: The authors compared the candidate module to expression- and lineage-matched random modules, ran independent compartment analysis in 23 patients (GSE132465), and used leukocyte transcript counts plus organoid/cell-line fitness screens.
• The result: Independent data showed tumour-wide correlation 0.735 (permutation P=0.00060) and epithelial correlation 0.376 (P=0.0892), with an absolute-correlation difference of 0.359 (95% CI -0.041 to 0.759); no survival association emerged, and only SCD fitness dependency reproduced.

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