Immunohistochemical Diagnosis Research Articles

Follicular Dendritic Cell Sarcoma of the Thyroid Gland: A Rare Case Report

Abstract Introduction Follicular dendritic cell sarcoma (FDCS) is a rare neoplasm of antigen-presenting cells within the reticuloendothelial system primarily originating in lymph nodes, but in almost one-third of the patients, extranodal sites are involved including oral cavity, tonsil, gastrointestinal tract, soft tissue, and breast. The thyroid gland is an extremely rare location for FDCS and very few cases are reported in the literature. Case Report Here, we present a 39-year-old man who presented with a swelling in the neck for 3 months and difficulty in breathing for 15 days. Following left hemi-thyroidectomy, histopathologically and immunohistologically, he was diagnosed as FDCS of thyroid arising in Castleman's disease. He received adjuvant radiation treatment. The patient had favorable prognosis with no evidence of disease for 6 years after treatment till date. Conclusion The aim of this report was to present the rare site of FDCS arising in the thyroid gland, the vital role of immunohistochemistry in diagnosis, and effectiveness of multimodality treatment for favorable prognosis.

The utilization of cytology for intraoperative diagnosis of primary central nervous system lymphoma

To investigate the diagnostic value of intraoperative cytology and rapid immunocytochemistry in primary central nervous system lymphoma. 254 cases of lymphoma and 82 cases of non-lymphoma were collected from 2010 to 2023. Frozen section(FS) was using alone in 44 cases during 2010–2014, FS and intraoperative cytology(IC) were using in 251 cases during 2015 to 2022. Rapid immunocytochemical(RICC, CD20, GFAP) were using with FS + IC in 41 cases during 2021 to 2023. Method One: According to the results of archives, statistic the diagnostic accuracy of lymphoma during three time periods. Method Two: All cases were randomly renumbered, 4 neuropathologists compared the accuracy of independent histology and that of combining cytology. The archives showed the diagnostic accuracy of FS in PCNSL was 77.27%, FS + IC was 86.06%, FS + IC + RICC was 92.68%. The retrospective study demonstrated the diagnostic accuracy of FS was 79.76%, FS + IC was 87.33% and FS + IC + RICC was 92.68%. The positive predictive value, negative predictive value, sensitivity, specificity and accuracy of CD20 were 100%, 76.92%, 90.32%, 100% and 92.68%, respectively. The results of the paired χ2 test was no statistically significant difference (0.05 < P < 0.1) between FS + IC + RICC and immunohistochemical (IHC) diagnosis of paraffin sections. The integration of IC + RICC + FS diagnosis can significantly enhance the intraoperative diagnostic accuracy of PCNSL and rectify potential errors that may occurred when relying solely on FS diagnosis.

Incidental finding of intramural splenic heterotopy in the colon mimicking subepithelial neoplasm: a case report

AimThe aim of this case report is describe an unprecedented case with histological and immunohistochemical diagnosis of splenic heterotopy in the colon using material obtained by endoscopic ultrasound-guided biopsy.BackgroundSplenic heterotopia is a benign condition characterized by the implantation of splenic tissue in areas distant from its usual anatomical site, such as the peritoneum, omentum, mesentery, liver, pancreas, and subcutaneous tissue and, more rarely, in locations such as the colon and brain. It is generally associated with a history of splenic trauma or splenectomy and typically does not cause specific symptoms.Case presentationA 35-year-old white male patient who was healthy, with no history of trauma or splenectomy, but had a family history of colorectal neoplasia underwent colonoscopy for screening. The examination revealed a large bulge in the proximal descending colon, covered by normal-appearing mucosa. Endoscopic ultrasound-guided puncture was performed with a 22 gauge fine needle biopsy, and the histopathological and immunohistochemical analysis results were consistent with a heterotopic spleen.ConclusionsThis is the first report of a primary intramural colic splenosis case with histological and immunohistochemical diagnosis of splenic heterotopia in the colon, using material obtained by endoscopic ultrasound and ultrasound-guided biopsy.

Antioxidants as Protection against Reactive Oxygen Stress Induced by Formaldehyde (FA) Exposure: A Systematic Review.

Formaldehyde induces oxidative stress and is carcinogenic, particularly squamous cell carcinoma of the nasopharyngeal area. Around us, in exhaust gases, cigarette smoke, and various industrial products, FA primarily affects the respiratory tract and other organs like the cornea, liver, kidneys, brain, and cardiovascular system. This study aims to determine if antioxidants can mitigate FA's harmful effects. Several databases, including PubMed, Science Direct, Springer, and Wiley, were systematically searched. Research publications on antioxidants mitigating FA-induced oxidative damage were included, but reviews and articles lacking complete texts were excluded. SYRCLE's risk of bias tool for animal studies has been used. Tables were used for data synthesis. Out of 8790 articles, 35 publications detailing tissue homogenate for biochemical analysis, standard hematoxylin-eosin staining, and immunohistochemistry markers for histopathological and immunohistochemical diagnosis were selected. Most studies were case-control studies, utilizing rat or mouse models. Additionally, one cohort study on industrial workers was analyzed. Antioxidants, including plant extracts, vitamins, and pigments, can prevent or heal FA-induced lesions. However, human studies, particularly biopsies, remain challenging, and animal trials are limited. Further research is needed to confirm FA's long-term effects and optimize antioxidant dosages.

Utility of p53 Immunohistochemistry in Diagnosis of Human Papillomavirus Associated Oral Epithelial Dysplasia: A Retrospective Study of 105 Patients

Utility of p53 Immunohistochemistry in Diagnosis of Human Papillomavirus Associated Oral Epithelial Dysplasia: A Retrospective Study of 105 Patients

Hematological, histomorphological, and immunohistochemical diagnosis of bilateral testicular Sertoli cell tumor in a Mongrel dog: a case history

Hematological, histomorphological, and immunohistochemical diagnosis of bilateral testicular Sertoli cell tumor in a Mongrel dog: a case history

Efficacy and histologic frequencies of endoscopic ultrasonography‐guided tissue acquisition using conventional fine‐needle aspiration needles for gastric subepithelial hypoechoic mass

AbstractIntroduction/PurposeFor gastric subepithelial lesions (GSELs) showing a hypoechoic mass (HM) on endoscopic ultrasonography (EUS) imaging, the utility of EUS‐guided tissue acquisition using conventional fine‐needle aspiration needles (EUS‐TA‐CFNAN) and the frequency of histological types remain unclear. This study aimed to examine this issue.MethodsThis prospective observational study enrolled 291 consecutive patients who underwent EUS‐TA‐CFNAN for GSELs showing an HM (GSELHM) on EUS imaging. Immunohistochemical analysis was performed for all EUS‐TA‐CFNAN and surgically resected specimens. The main outcome measures were the technical results of EUS‐TA‐CFNAN and the frequency of histological types in GSELHM.ResultsThe endoscopic ultrasound‐guided tissue acquisition using conventional fine‐needle aspiration needle diagnosis rate for GSELHM was 80.1% (95% confidence interval [CI]: 75.0–84.5, 233/291). It was significantly lower for antrum (P = 0.004) and lesions smaller than 2 cm (P = 0.003). There were no adverse events. The immunohistochemical diagnoses of EUS‐TA‐CFNAN included 149 cases of gastrointestinal stromal tumour (GIST) (51.2%), 48 cases of leiomyoma (16.5%), 11 cases of schwannoma (3.8%), 8 cases of the ectopic pancreas (2.7%), 5 cases of subepithelial lesion like cancer (1.7%), 12 cases of other lesions (4.1%), and 58 cases of undiagnosable lesions (19.9%). The frequency of malignant or potentially malignant tumour in GSELHM was 55.0% (95% CI: 49.1–60.8, 160/291). Surgery was performed in 149 patients according to the conclusive EUS‐TA‐CFNAN results, in which the diagnostic accuracy of EUS‐TA‐CFNAN was 97.3% (95% CI: 94.7–99.9, 145/149).ConclusionThe use of EUS‐TA‐CFNAN for GSELHMs is safe and accurate. Gastric subepithelial lesions showing a hypoechoic mass have a reasonably high possibility of containing malignant or potentially malignant tumours, including GISTs.

Development of monoclonal antibodies against oropouche virus and its applicability to immunohistochemical diagnosis

Orthobunyavirus oropouche ense virus (OROV), the causative agent of Oropouche fever, is widely dispersed in Brazil and South America, causing sporadic outbreaks. Due to the similarity of initial clinical symptoms caused by OROV with other arboviruses found in overlapping geographical areas, differential diagnosis is challenging. As for most neglected tropical diseases, there is a shortage of reagents for diagnosing and studying OROV pathogenesis. We therefore developed and characterized mouse monoclonal antibodies and, one of them recognizes the OROV nucleocapsid in indirect immunofluorescent (IFA) and immunohistochemistry (IHC) assays. Considering that it is the first monoclonal antibody produced for detecting OROV infections, we believe that it will be useful not only for diagnostic purposes but also for performing serological surveys and epidemiological surveillance on the dispersion and prevalence of OROV in Brazil and South America.

Intestinal full-thickness needle-core biopsy via laparotomy is safe, rapid, and effective and less invasive than standard incisional biopsy in dogs and cats.

To describe the intestinal full-thickness needle-core biopsy technique via abdominal laparotomy outcomes and compare the histopathological and immunohistochemical diagnosis with standard incisional intestinal biopsy technique in dogs and cats. 3 dogs and 17 cats. Client-owned dogs and cats were prospectively enrolled if intestinal full-thickness biopsies were indicated for the diagnosis of diffuse chronic intestinal diseases following ultrasonography. The study period extended from June 2021 to December 2022. All animals underwent intestinal biopsies with both techniques (needle-core biopsy and standard incisional biopsy) via abdominal laparotomy. Data collected included clinical signs, biopsy collection times, complications, and histopathologic and immunohistochemical findings. A minimum follow-up of 14 days was required. The main clinical sign at presentation was chronic vomiting (65%). Mean needle-core biopsy collection time (262 seconds) was significantly shorter than standard incisional biopsy collection time (599 seconds; P < .000001). The incidence of minor complications was 10% (inflammation of the skin surgical site secondary to licking). One catastrophic complication occurred on a standard incisional biopsy site in 1 cat in a context of bile peritonitis (5% of all cases). There were no complications associated with the needle-core biopsy. All but 1 cat were discharged, with a median of 2 days (range, 1 to 4 days) after surgery. The diagnoses resulting from both techniques were 100% concordant for the distinction between inflammatory bowel disease and intestinal lymphoma via histopathology and immunochemistry. Needle-core biopsy is safe, rapid, and effective and is less invasive than standard incisional biopsy.

Characterization of the malignant cells and microenvironment of infantile fibrosarcoma via single-cell RNA sequencing.

Infantile fibrosarcoma (IFS) is the most prevalent soft tissue sarcoma in children under 1 year old and is known for its rapid growth. The tumor lacks specific immunohistochemical tumor marker and a general view of tumor microenvironment (TME). Its primary therapeutic intervention places patients at a risk of disability or mutilation. This study aimed to elucidate the universal transcriptional characteristics of IFS and explore novel targets for diagnosis and therapy using single-cell RNA sequencing (scRNA-seq). Fresh tissue samples of IFS for scRNA-seq were collected from four patients before other treatments were administered. We conducted cell clustering, inferring copy number variation from scRNA-seq (InferCNV) analysis, gene differential expression analysis, cell function evaluation, Pearson correlation analysis, and cell-cell and ligand-receptor interaction analysis to investigate the distinct ecosystem of IFS. According to the single-cell resolution data, we depicted the cell atlas of IFS, which comprised 14 cell populations. Through comparison with normal cells, the malignant cells were distinguished, and potential novel markers (POSTN, IGFBP2 and CTHRC1) were identified. We also found four various functional malignant cell subtypes, three of which exhibited cancer stem cells (CSCs) phenotypes, and investigated the interplay between these subtypes and nonmalignant cells in the TME of IFS. Endothelial cells and macrophages were found to dominate the cell-cell communication landscape within the microenvironment, promoting tumorigenesis via multiple receptor-ligand interactions. This study provides a comprehensive characterization of the tumor transcriptome and TME of IFS at the cellular level, offering valuable insights for clinically significant advancements in the immunohistochemical diagnosis and treatment of IFS.

The Validity of Immunohistochemistry in Detecting Microsatellite Instability in Pediatric Solid Neoplasms

Abstract Background: The DNA mismatch repair (MMR) is the biological pathway that plays a key role in maintaining genomic stability during DNA replication and recombination. The value of MMR pathway is under investigation in pediatrics’ solid tumors. Aims: In this research work, we investigated the proteins involved in the oncogenesis of pediatric solid neoplasms and detect these proteins in a representative cohort sample of Saudi pediatric cases under the bioinformatic networking technique. We also described the MLH1, BRAF, p53, proliferating cell nuclear antigen, and PMS2 along with MSH2-MSH6 antibodies to be a diagnostic immunohistochemistry (IHC) panel for identifying MMR mutations. This research will open the new doors for advanced research on proteins involved in the oncogenesis of pediatric solid neoplasms. The hypotheses were tested on a sample of solid malignancies and IHC results were reported. Material and Methods: The study was conducted in different institutions in Saudi Arabia. The inclusion criteria required enrolling biopsies of solid neoplasms or resected solid malignant neoplasms presented to the laboratories in the participating institutions of all pediatric patients (aging from 0 to 14 years). The specimens were examined microscopically utilizing Hematoxylin and Eosin stain as well as the utilization of MMR proteins immunohistochemistry (IHC), and PNCA. Results: The qualitative assessment showed that IHC diagnosis yielded positive results with ≥80% of positive cells (intact) for MMR proteins (MSH2, MSH6, PMS2, and MLH1). The PCNA protein was absent only in vaginal germ cell tumor and metastatic medulloblastoma. Conclusion: In our sample, we have found that there is an intact MMR proteins expression. Also, the IHC technique presents accuracy and ability as a diagnostic technique for identifying the different types of pediatric cancers. The MMR protein panel accompanied with PCNA panels holds additional value, as it helps reduce dependency solely on MMR protein expressions.

Treatment of Chronic Endometritis with Vague Symptoms in Patients with Endometrial Hyperplasia

Aim. To develop new therapeutic approaches for chronic endometritis with vague symptoms, which is frequently diagnosed in patients with endometrial hyperplasia.Materials and Methods. We collected the material from uterine scrapings in patients (age 25-63 years) with endometrial hyperplasia (diagnosed by ultrasound examination) and abnormal uterine bleeding which occurred during hysteroscopic dilation and curettage. Among the exclusion criteria were intraepithelial neoplasia and atypical endometrial hyperplasia, cancer, systemic inflammation, and hormonal therapy. To verify the diagnosis, we employed immunohistochemistry, digital slide scanning, and morphometry.Results. This study confirmed the value of immunohistochemical diagnosis underlying the pathogenetic therapy of endometrial hyperplasia using non-steroidal anti-inflammatory drugs. Inflammatory markers indicating the distribution and quantitative alterations in cell populations had the highest diagnostic value.Conclusion. We developed a molecularly oriented algorithm for the treatment of patients with endometrial hyperplasia. This algorithm improves existing preventive, diagnostic and therapeutic approaches using immunohistochemical techniques. Such molecular testing can help in making correct therapeutic decisions.

Diagnosis and surgical treatment of associated papillary lung adenocarcinoma to canine distemper: case report

Lung neoplasms in dogs have a multifactorial etiology, and animals aged 10 or older are the most affected, with no sexual or racial predisposition. Adenocarcinoma is the most common type of cancer and represent around 80% of the cases. The aim of this study was to describe a case of an 11-year-old dog of no defined breed (SRD) with papillary lung adenocarcinoma and canine distemper virus. Clinical examination revealed a body condition score (BCS: 5.0), normocardial, tachypneic, normothermic, mild dehydration (5 - 6%), hyporexia, hypocolored mucous membranes, normodipsia, normuria and normoquesia. Hematological tests (blood count, biochemistry) were carried out, initially showing leukocytosis and regenerative anemia. Imaging tests of the chest (x-ray) and computed tomography (CT) showed a nodule, with approximately 7cm in circumference in the ventral portion of the right caudal lung lobe. Treatment was by thoracotomy to excise the nodule. The excised material was sent for histopathological and immunohistochemical diagnosis, which confirmed the diagnosis of lung adenocarcinoma. Infection with the distemper virus was confirmed by the identification of the Lentz corpuscle, which was found in the blood sample during the differential leukocyte count, when the animal was returned for re-evaluation. The animal did not respond to treatment and died 48 hours after the diagnosis of distemper, in response to cardiorespiratory arrest, 12 days after the removal of the nodule. Infection with the distemper virus led to an unfavorable prognosis and made post-surgical treatment impossible, culminating in the animal's death.

Immunohistochemical Diagnosis of Amyloid Typing: Utility and Limitations as Determined by Liquid Chromatography-Tandem Mass Spectrometry.

Although immunohistochemical techniques and proteomic analysis are widely used for typing diagnosis of amyloidosis, the diagnostic utility of immunohistochemical evaluation is not well understood. We used immunohistochemical techniques to characterize staining patterns of in-house rabbit polyclonal anti-κ, anti-λ, anti-transthyretin antibodies, and commercial anti-amyloid A and anti-β2-microglobulin antibodies in 40 autopsy cases. In thirty cases (75%), the subtype was determined by using the criterion that amyloid is strongly and diffusely positive for one antibody while negative for other antibodies. We then performed proteomic analysis of all 40 cases. In 39 cases, we identified only one amyloid protein and confirmed the immunohistochemically determined subtypes of the abovementioned 30 cases. In seven other cases, we could retrospectively determine subtypes with immunohistochemistry by using information from proteomic analysis, which increased the immunohistochemistry diagnosis rate to 92.5% (37/40). In one case, we identified double subtypes, both immunohistochemically and with proteomic analysis. In the remaining three cases, proteomic analysis was essential for typing diagnosis. The present findings suggest that combined immunohistochemistry and proteomic analysis is more useful than immunohistochemistry alone. Our findings highlight the importance of carefully interpreting immunohistochemistry for anti-TTR and light chain and offer insights that can guide amyloid typing through immunohistochemistry.

Differential diagnosis of primary and metastatic ovarian carcinomas

Ovarian tumors constitute 3.4 % of the structure of oncological diseases in women worldwide. However, the ovaries are also a common target for metastasis of carcinoma from other organs. Conducting differential diagnosis between primary carcinoma and metastasis is often challenging. The aim of this study is to highlight the issues of morphological and immunohistochemical differential diagnosis of primary ovarian carcinomas and metastases from carcinomas of various organs to the ovaries. Materials and methods. Data analysis of clinical and pathohistological studies of 381 patients. Paraffin sections for pathohistological studies were stained with hematoxylin and eosin using standard methodology. Immunohistochemical studies were conducted in 161 cases using a panel of antibodies: cytokeratins, estrogen receptors, progesterone receptors, CA125, TTF1, Vimentin, CDX2, Villin, Chromogranin A, Synaptophysin, CD56, GATA, p53, Inhibin A, FOXL-2, PAX-8, Ki-67. The specimens were examined and analyzed using the Axioskop 40 microscope (Zeiss) with the AxioCam MRc camera (Zeiss). Results. The article discusses key issues of differential diagnosis of primary and metastatic ovarian carcinomas based on a large clinical and operational material. The application of an adequate panel of immunohistochemical antibodies for verification is considered. The results of the frequency of occurrence of different histological variants of ovarian carcinomas and metastases to the ovaries from carcinomas of other organs are provided based on our own research from 2019 to 2023. The main morphological and immunohistochemical indicators for practical use in the work of a pathologist in the verification of ovarian tumors are presented. An example of forming an antibody panel, taking into account clinical and morphological indicators in a specific clinical case from our own practice, is given. Conclusions. Metastases of carcinomas from other organs to the ovaries constitute half of all cases requiring immunohistochemical investigation based on morphological structure. The most common are metastases from breast and colorectal cancers. However, the diagnosis of metastatic intestinal carcinoma is particularly challenging, as there is usually no clear clinical picture. In the differential diagnosis of primary and metastatic ovarian tumors, a comprehensive approach to analyzing the clinical presentation, microscopic structure of the tumor, and the surrounding tissue plays a significant role. Additionally, the formation of an antibody panel, taking into account these data, is crucial. The article provides a list of antibodies that have demonstrated greater effectiveness in our work.

Development of a monoclonal antibody to ITPRIPL1 for immunohistochemical diagnosis of non-small cell lung cancers: accuracy and correlation with CD8+ T cell infiltration.

Introduction: Cancer biomarkers are substances or processes highly associated with the presence and progression of cancer, which are applicable for cancer screening, progression surveillance, and prognosis prediction in clinical practice. In our previous studies, we discovered that cancer cells upregulate inositol 1,4,5-triphosphate receptor-interacting protein-like 1 (ITPRIPL1), a natural CD3 ligand, to evade immune surveillance and promote tumor growth. We also developed a monoclonal ITPRIPL1 antibody with high sensitivity and specificity. Here, we explored the application of anti-ITPRIPL1 antibody for auxiliary diagnosis of non-small cell lung cancer (NSCLC). Methods: NSCLC patient tissue samples (n = 75) were collected and stained by anti-ITPRIPL1 or anti-CD8 antibodies. After excluding the flaked samples (n = 15), we evaluated the expression by intensity (0-3) and extent (0-100%) of staining to generate an h-score for each sample. The expression status was classified into negative (h-score < 20), low-positive (20-99), and high-positive (≥ 100). We compared the h-scores between the solid cancer tissue and stroma and analyzed the correlation between the h-scores of the ITPRIPL1 and CD8 expression in situ in adjacent tissue slices. Results: The data suggested ITPRIPL1 is widely overexpressed in NSCLC and positively correlates with tumor stages. We also found that ITPRIPL1 expression is negatively correlated with CD8 staining, which demonstrates that ITPRIPL1 overexpression is indicative of poorer immune infiltration and clinical prognosis. Therefore, we set 50 as the cutoff point of ITPRIPL1 expression H scores to differentiate normal and lung cancer tissues, which is of an excellent sensitivity and specificity score (100% within our sample collection). Discussion: These results highlight the potential of ITPRIPL1 as a proteomic immunohistochemical NSCLC biomarker with possible advantages over the existing NSCLC biomarkers, and the ITPRIPL1 antibody can be applied for accurate diagnosis and prognosis prediction.

Plexiform fibrohistiocytic tumor of elbow: A rare case report

Plexiform fibrohistiocytic tumor is a very rare tumor of soft tissue that affects usually adolescents and children. On histopathological examination it shows multiple small nodules or fascicles that are arranged in plexiform pattern, hence its name. Here we are presenting a case of occurrence of PFT in bilateral elbows. Patient presented with gradually increasing in size and painless swellings for 7 years. Excision was done and on the basis of histopathological and immunohistochemical examination diagnosis of PFT was reached.

Prevalence and interpretation of AFF immunostain of DEK::AFF2 fusion-associated papillary squamous cell carcinoma in a retrospective cohort of recurrent sinonasal papillomas.

DEK::AFF2 fusion-associated papillary squamous cell carcinoma is a novel entity characterized by its unique translocation and malignant clinical course. In this study, AFF immunohistochemistry (IHC) was performed in recurrent sinonasal papillomas for reviewing the prevalence of undiagnosed DEK::AFF2 carcinomas and to investigate the performance of AFF IHC in diagnosis of DEK::AFF2 carcinomas. Recurrent sinonasal papillomas after surgical excision in a two-decade period were retrieved. Histologic slides were reviewed for features of DEK::AFF2 carcinoma. AFF IHC was performed, and cases with any (> 1%) nuclear positivity were validated by DEK break apart fluorescence in situ hybridization. Totally 43 cases were included, comprising 28 inverted, 6 exophytic, one oncocytic, and 8 non-specified sinonasal papillomas. Five (11.6%) cases exhibited positivity to AFF IHC. Three cases exhibited patchy weak to moderate staining intensity predominantly in a granular cytoplasmic pattern. Two cases exhibited strong and diffuse (> 90%) nuclear staining. Cases showing weak staining were negative for DEK rearrangement, while those with strong staining were positive. Both cases of DEK::AFF2 carcinoma showed aggressive behavior with extensive local invasion and nodal metastasis. Background stromal plasma cells, when present, consistently showed strong and diffuse staining. AFF IHC was further performed in plasmacytoma samples as control and showed strong and diffuse immunoreactivity. A significant minority of recurrent sinonasal papillomas represent DEK::AFF2 carcinomas. Granular, cytoplasmic, or incomplete AFF staining should be considered as negative. In view of the rarity of DEK::AFF2 carcinomas, plasma cells and plasma cell neoplasms are potential for internal and surrogate external controls.

Diagnosing Lymphoma on Core Needle Biopsy and the Challenging Role of Immunohistochemistry.

Publications and primary literature both describe the latest advancements in immunohistochemical diagnosis of lymphomas. Along with the updated categorizations, the growing reliance on small biopsy samples to assess lymphoma poses a constant difficulty in hematopathology diagnosis and heightens the demand for immunohistochemistry (IHC). This study aimed to provide practicing lymphoma and hematopathologists with an overview of novel immunohistochemical markers and new applications of already established immunohistochemistry markers to be helpful in lymphoma diagnosis, especially in core needle biopsies. The information was sourced from a review of relevant literature and personal experience gained through professional practice. To effectively diagnose and treat hematolymphoid neoplasms, we need to have a comprehensive understanding of the constantly evolving range of immunohistochemistry studies. This article introduced new markers that contribute to our overall knowledge of the disease, diagnosis, and treatment. The addition of these markers might be helpful in supporting the tumor diagnosis on limited sample material obtained from needle biopsies.

Immunohistochemical diagnosis of tumor-associated macrophages in patients with muscle-invasive bladder cancer after radical cystectomy

BACKGROUND: Bladder cancer is a serious problem of oncourology. The gold standard of treatment for muscle-invasive bladder cancer is radical cystectomy with previous neoadjuvant chemotherapy. Unfortunately, the effectiveness of radical treatments is severely limited in the long term. For this reason, research in the field of predicting survival can significantly improve long-term oncological results. The determination of the levels of macrophages associated with the tumor appears promising.&#x0D; AIM: to determine the effect of the expression levels of macrophages associated with a tumor on survival rates in patients diagnosed with muscle-invasive bladder cancer after radical cystectomy.&#x0D; MATERIALS AND METHODS: the study was conducted on the basis of the Clinic of the Bashkir State Medical University in the period from 01.05.2021 to 01.07.2023. The study involved 66 patients with an established diagnosis of muscle-invasive bladder cancer. After surgical treatment, histological and immunohistochemical studies were performed to determine CD68 and CD163 levels. After 24 months, a survival analysis was performed to determine the levels of general, tumor-specific and relapse-free survival and the construction of Kaplan–Mayer graphs.&#x0D; RESULTS: According to the results of the analysis, there was a significant decrease in survival in groups with high CD68 and CD163 expression rates (p 0.05). In the study groups, there was a significantly significant correlation between high levels of CD68 and CD163 (p 0.05).&#x0D; CONCLUSIONS: CD68 and CD163 can act as independent markers of predicted survival in patients with muscle-invasive bladder cancer after radical cystectomy.