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        Measuring Invasion in an Organotypic Model

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        Organotypic cultures are in vitro models that can be used to study the interactions between tumour and stromal cells. Collective tumour cell invasion in organotypic assays resembles that seen in human tissues in vivo, suggesting physiological relevance. A qualitative, pathological description of such invasion may be inadequate, and there is therefore a need to accurately quantify the degree of invasion. Although the simplest method to quantify invasion is to measure maximum invasive depth, this ignores the importance of the pattern of tumour invasion, which often reflects tumour aggressiveness. We use image analysis software to analyse organotypic invasion objectively, taking into account the average depth of tumour invasion, and the number and area of invading tumour islands. The product of these parameters is termed the “invasion index,” which maximises differences in invasion and also reflects the invasive pattern of the gel in a way that none of the individual parameters does alone.
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