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• W2898092889 abstract "Abstract Background Chemotherapeutic agents are often mutagenic. Induction of mutation associated neo-epitopes is one of the mechanisms by which chemotherapy is thought to increase the number of tumor-infiltrating lymphocytes, but the clinical relevance of this triggered immune response is not known. We decided to investigate, whether treatment with various chemotherapeutic agents with significantly different mutagenic capacity induce a significantly different number of stromal tumor-infiltrating lymphocytes (StrTIL) in the clinical setting. Methods 112 breast carcinoma cases treated with pre-operative chemotherapy were selected for the study. According to chemotherapy regimen 28/112 patients received platinum-based, 42/112 cyclophosphamide-based and 42/112 anthracycline-based chemotherapy. The percentage of stromal tumor-infiltrating lymphocytes (StrTIL) was evaluated on hematoxylineosin stained slides of pre-treatment core biopsy (pre-StrTIL) and post-treatment surgical tumor samples (post-StrTIL), according to the most recent recommendation of International TILs Working Group. In survival analyses, TIL changes (ΔStrTIL) were calculated from the difference between post-StrTIL and pre-StrTIL. Results Of the 112 cases, 58.0% (n=65) were hormone receptor (HR) positive and 42.0% (n=47) were HR negative. There was a trend of higher post-StrTIL compared to pre-StrTIL (median 6.25% vs. 3.00%; p<0.001). When analyzing the pre-StrTIL and post-StrTIL among the three treatment groups, we experienced significant StrTIL increase independently of the treatment applied. Based on the results of survival analyses both post-StrTIL and ΔStrTIL was found to be independent prognostic factor in HR negative cases. Each 1% increase in post-StrTIL reduced the hazard of distant metastases development by 2.6% (hazard ratio: 0.974; CI: 0.948-1.000; p=0.05) and for each 1% ΔStrTIL increment, the risk of distant metastases was reduced by 4.3% (hazard ratio: 0.957; CI: 0.932-0.983; p=0.001). The prognostic role of StrTIL in HR positive cases could not be proven. Conclusions StrTIL expression might be stimulated by highly (platinum), moderately (cyclophosphamide) and marginally (taxane, anthracycline) mutagenic chemotherapeutic agents. Increase in StrTIL in residual cancer compared to pre-treatment tumor tissue is associated with improved distant metastasis-free survival in cases with HR negative breast carcinoma." @default.
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• W2898092889 date "2018-10-29" @default.
• W2898092889 modified "2023-10-17" @default.
• W2898092889 title "Influence of mutagenic versus non-mutagenic pre-operative chemotherapy on the immune infiltration of breast cancer" @default.
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• W2898092889 doi "https://doi.org/10.1101/455055" @default.
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