The data are reported on studying the stromal response of 19 melanomas of analogous localization, showing the same type of growth, histological structure, the level of invasion and area of ulceration in patients with positive and negative delayed hypersensitivity reaction to injection of the polysaccharide fraction from melanoma tissue. A high degree of pronouncement of lymphoid-cellular infiltration of tumor stroma correlated with a positive delayed hypersensitivity response, whereas a low degree -- with a negative one.
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