In 1974, SGO defined microinvasive cancer as any lesion in which neoplastic cells invade the stroma, in one or more sites, to a depth of ≤3 mm below the base of the epithelium, without lymphatic or blood vessel involvement.

SGO：Society of Gynecologic Oncologists

2019版婦產科 P207有cervical cancer FIGO stage

侵犯深度<3mm：stage IA1

侵犯深度3~5mm：stage IA2

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ps. 外陰癌 cancer of the vulva的定義才是1 mm喔

https://www.ncbi.nlm.nih.gov/books/NBK568365/

There have been more than 20 different definitions of microinvasion in the literature (Marsden et al., 2006). In summary, the most recent and widely used is the FIGO classification (Kurman et al., 2014), which limits microinvasive disease to a depth of 5 mm and a width of 7 mm (stage IA1 limits the depth to 3 mm and stage IA2 to 5 mm).

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