[Gender Aspects in Gastrointestinal Tumours and Their Prognosis in Regard to Multimodal Treatment Concepts].

Systematic analyses of gender effects in gastrointestinal malignancies are currently lacking, partly because sex and gender have not been used as stratification criteria in major studies on the topic. It is, however, indisputable that gastrointestinal tumours differ in risk factors, incidence and prognosis between the genders. This review summarises the most important findings on differences related to biological sex and sociocultural gender and discusses anatomic specifics with immediate significance for surgical interventions. Epidemiological differences in upper gastrointestinal malignancies are most prominent in regard to histological subtypes, directly affecting diagnostics, therapy, and prognosis. Women have a better prognosis in many of these tumour subtypes. For colorectal carcinoma, sex hormones, specifically oestrogens, appear to play a distinct role in tumourigenesis. Histopathological analysis of the expression of oestrogen receptor beta (ERβ) in the tumour tissue has attracted interest since it was shown that women with low ERβ expression have a better prognosis than men with comparable ERβ status. Data on the higher incidence of right-sided colon carcinoma and non-polypoid neoplasms in women could lead to improved screening programmes. Men and women cite differing reasons for avoidance of screening colonoscopies, thus gender specific approaches could improve colon cancer prevention programmes. Data on differing bioavailability of 5-fluorouracil between the genders are useful to minimise adverse effects of chemotherapy and should be accounted for in dosage. Further systematic analysis of gender effects on gastrointestinal tumours is warranted and would be a substantial step towards personalised oncological surgery.