Researchers have built a detailed, stage-by-stage map of how liver cancer cells travel to the lungs and evade the immune system — and identified a fleeting cellular state that may be a weak point for stopping cancer from spreading.
The team, led by Yunfan Sun at Zhongshan Hospital, Fudan University, combined several cutting-edge techniques — high-resolution spatial transcriptomics, single-cell RNA sequencing and chromatin-accessibility profiling — to watch metastasis unfold across nine sequential stages, in mouse models of hepatocellular carcinoma and in human metastatic samples. The work was published July 30, 2026 in Science.
What they found
Early on, rare wandering tumor cells slip into a quiet, dormant-like state (marked by high activity of a gene called Phgdh). In that state, the cells switch off distress-signal molecules that would normally summon immune cells — effectively going dark to evade detection. Supporting lung cells and a specific type of macrophage then help the hidden cancer cells settle and expand into full metastases.
Why it matters
Crucially, when the researchers disrupted this hiding mechanism — genetically or with drugs — the immune system regained the ability to spot the cancer, and metastatic growth shrank. Because the vulnerable states are transient, the authors suggest they open narrow “therapeutic windows” to intercept cancer spread before established tumors form. The findings are early and mechanistic, but they point toward new strategies aimed at metastasis, the process responsible for most cancer deaths.