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Objective: Invasive lobular carcinoma (ILC) of the breast makes up 5 to 15 percent of all invasive breast cancers. It has distinctive clinical and histopathological features when compared to invasive ductal carcinoma (IDC). This study intends to describe factors influencing sentinel lymph node (SLN) positivity in patients with "pure" ILC. Materials and Methods:Data of 105 patients, who were treated at a tertiary oncology center, with lobular carcinoma of the breast that were subjected to SLN biopsy was probed retrospectively. Patients were categorized as ≤60 and >60 years of age, positive or negative for estrogen receptor and progesterone, tumor grade I, II and III, Ki67≤15% and >30%, lymphovascular invasion presence and the presence of multicentricity and multifocality.Results: Mean age at the time of diagnosis was 52 (38-81). Mean tumor size was 2.7 cm (0.7-13cm). Univariate analyses revealed a significant relationship between tumor size (≤2 cm vs >2cm) and metastasis in the SLN. This relation kept its significance in multivariate analyses. (p=0.013). Conclusion:With so many different characteristics from IDC, ILC is mostly a uniform tumor. In this study, tumor size was the only independent clinical parameter that was found related to SLN metastases.

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Background: Majority of colorectal neoplasms are adenocarcinomas but there is a small percentage of tumors from other histological cell lines Method: One thousand one hundred patients who were applied surgical treatment due to colorectal cancer at general surgical clinic between years of 2010-2020 were examined. Patients have been grouped as Diffuse large b cell lymphoma (DLBCL) (group1), Malignant melanoma (group2), Medullary carcinoma (group3), Neuroendocrine tumor (group4) and they were included in the study in this way. In the groups,clinicopathological data of patients and their survival periods have been compared. Results: Twenty patients are included in our study: Group 1 was composed of 5, Group 2 was composed of 4, Group 3 was composed of 3, and Group 4 was composed of 8 patients. Emergency application rate (60%) was higher in Group 1 (p: 0.004). A verage age was above 50 in 4 groups and there was no difference between groups (p:0,966).Tumor diameter was on average (cm)(8 vs 6,55 vs 5,4 vs 3,75 p:0,073) in the groups, The number of lymph nodes dissected were (13 vs 14.5 vs 19 vs 19 p:0.373) The number of metastatic lymph nodes were ( 0 vs 1.5 vs 0 vs 0.5 p:0.188). Survival was significantly shorter in the malignant melanoma group, the longest survival was in the neuroendocrine tumor group (15.625vs8.5vs20 vs 40.857 p:0.001) Conclusions: Although clinicopathological features and postoperative follow-up results were similar, there were differences in survival among patients. Maligant melanoma histopathological type had a worse prognosis than other tumors