The wound inflammatory response exacerbates growth of pre‐neoplastic cells and progression to cancer

Abstract

There is a long‐standing association between wound healing and cancer, with cancer often described as a “wound that does not heal”. However, little is known about how wounding, such as following surgery, biopsy collection or ulceration, might impact on cancer progression. Here, we use a translucent zebrafish larval model of Ras G12V ‐driven neoplasia to image the interactions between inflammatory cells drawn to a wound, and to adjacent pre‐neoplastic cells. We show that neutrophils are rapidly diverted from a wound to pre‐neoplastic cells and these interactions lead to increased proliferation of the pre‐neoplastic cells. One of the wound‐inflammation‐induced trophic signals is prostaglandin E 2 (PGE 2 ). In an adult model of chronic wounding in zebrafish, we show that repeated wounding with subsequent inflammation leads to a greater incidence of local melanoma formation. Our zebrafish studies led us to investigate the innate immune cell associations in ulcerated melanomas in human patients. We find a strong correlation between neutrophil presence at sites of melanoma ulceration and cell proliferation at these sites, which is associated with poor prognostic outcome.

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