Elucidating the nature of acinic cell carcinoma of the breast with high-grade morphology: evidence from case report.

BACKGROUND: Acinic cell carcinoma (AciCC) of the breast is a rare subtype of breast cancer. It was considered a low-grade triple-negative breast cancer (TNBC) with the potential to progress or transform into a high-grade lesion because of the molecular similarities with conventional aggressive TNBC in several genetic studies. Microscopically, the coexistence of classical low-grade and high-grade triple-negative components in breast AciCC is not uncommon. However, there is a scarcity of research on the comparative histopathological and genetic aspects of both components. CASE PRESENTATION: A 34-year-old woman with a nontender mass in the upper outer quadrant of the left breast was initially diagnosed with a malignant small round cell tumor (undifferentiated or poorly differentiated carcinoma) based on a preoperative biopsy, which was later identified as breast AciCC with a high-grade solid component. Left breast-conserving surgery with sentinel lymph node biopsy was performed. Microscopically, the breast AciCC consisted of a classical acinic component and a high-grade component. The latter demonstrated a solid sheet-like pattern characterized by large, round, pleomorphic or vesicular nuclei, prominent nucleoli, and frequent mitotic activities. Classical acinic architectures focally merged together to form solid nests and transited into high-grade areas. Remarkably, in the high-grade lesion, conventional immunochemical markers for breast AciCC, such as α1-antitrypsin (AAT), Lysozyme (LYS), Epithelial membrane antigen (EMA), S100 protein (S100), and cytokeratin (CK) were negative, whereas cell cycle protein D1 (cyclin D1) and vimentin showed diffuse expression. Next­generation sequencing (NGS) revealed that 43.5% of variants were identical in both components. Furthermore, PAK5 mutation; copy number (CN) loss of CDH1, CHEK1, and MLH1; and CN gains of CDK6, HGF, and FOXP1 were identified in the high-grade lesion. The patient was treated with eight cycles of adjuvant chemotherapy (epirubicin combined with cyclophosphamide) and radiotherapy after surgery, and she is currently alive for 43 months with no metastases or recurrences. CONCLUSIONS: This case demonstrates a comparative analysis of the histopathological and genetic characteristics of classical low-grade and high-grade components of AciCC within the same breast. This information may serve as a morphological and molecular basis for further investigation into the molecular mechanisms underlying high-grade lesions in breast AciCC.

The clinicopathological significance of thymic epithelial markers expression in thymoma and thymic carcinoma.

BACKGROUND: The classification of thymomas is based on the morphology of epithelial tumor cells and the proportion of lymphocytes. Type A thymomas are composed of the spindle or oval tumor epithelial cells. Tumor cells of B thymomas are epithelioid-shaped with increasing atypia. Type AB thymomas have the features of epithelial tumor cells of A and B thymomas. The diagnosis can be difficult because of the complex morphology. Some novel thymic epithelial markers have been reported in several preclinical studies, but they have not been applied to clinical practice. Here, we investigated the expression of 3 cortical and 3 medullary markers, which are thymoproteasome-specific subunit ß5t (ß5t), thymus-specific serine protease 16 (PRSS16), cathepsin V, autoimmune regulator (AIRE), CD40 and claudin-4. METHODS: Immunohistochemistry was used to analyze 53 cases of thymomas and thymic squamous cell carcinomas (TSCC), aiming to explore the expression of cortical and medullary epithelial markers and their correlation with histological classification, Masaoka-Koga stage, and prognosis. RESULTS: Our results found that for cortical epithelial markers the expression of ß5t, PRSS16, and cathepsin V was higher in type AB and B thymomas than in micronodular thymoma with lymphoid stroma (MNT), and we observed a dramatic increase of ß5t and PRSS16 expression in type AB compared to type A thymomas. In medullary epithelial markers, the expression of AIRE was higher in type A than in B3 thymomas. CD40 and ß5t expression were associated with the Masaoka-Koga stage. High cathepsin V expression was related to a good prognosis and a longer progression-free survival. CONCLUSION: This is the first comprehensive analysis of the role of thymic cortical and medullary epithelial markers as biomarkers for differential diagnosis and prognosis in thymic tumors. Thymic medullary epithelial immunophenotype was found to exhibit in type A, MNT, and TSCC. Type B thymomas primarily exhibited a cortical epithelial immunophenotype. Type AB thymomas showed cortical, medullary, or mixed corticomedullary epithelial immunophenotype. Our results demonstrated that thymic cortical and medullary epithelial markers including ß5t, PRSS16, cathepsin V, and AIRE could be used as ancillary markers in the diagnosis and prognosis of thymic epithelial tumors.

Malignant Mixed Epithelial and Stromal Tumor of the Kidney: Report of a Carcinosarcoma Case and an Updated Literature Review.

Mixed epithelial and stromal tumors of the kidney (MESTK) are rare and recently defined entities that comprise both epithelial and stromal cells. MESTK is mostly benign; however, to date, 18 borderline or malignant cases have been reported. In this study, we report a case of carcinosarcoma exhibiting a large carcinoma and small sarcoma component, and review the relevant literature. The patient was a 59-year-old woman who presented with a large mass in the left kidney having solid and focal cystic components. The patient underwent left radical nephrectomy. The tumor was gray-white and solid-cystic, with a relatively clear boundary. Microscopically, the tumor revealed benign and malignant components. The benign component consisted of multiple tubules, variable-sized cysts lined with benign epithelium, and hyalinized stroma. The malignant component was composed of predominantly small cell neuroendocrine carcinoma and a small quantity of adenocarcinoma, squamous cell carcinoma, and sarcoma. Finally, a diagnosis of the malignant MESTK was made. Certain cases of borderline or malignant transformation of MESTK have been published, so it is important to enhance findings made by other studies.

Benign but fatal: management of endotracheal Rosai-Dorfman disease with acute onset.

Rosai-Dorfman disease (RDD) is a non-malignant condition mainly manifesting as a proliferation of histiocytes in lymph nodes. Endotracheal RDD (ERDD) with an acute onset presentation is extremely rare. There are few case reports of ERDD mainly concerning its pathology, diagnostics and bronchoscopic treatment, without providing sufficient clinical information from a comprehensive perspective. As a novel and challenging technique, tracheal resection and reconstruction (TRR) with spontaneous-ventilation video-assisted thoracoscopic surgery (SV-VATS) has been reported as feasible and safe in highly selected patients, but few centres have shared their experience with this approach. This case-based discussion includes not only practical issues in the management of a life-threatening ERDD patient, but also specialists' views on the management of acute obstructive airway, and the surgeons' reflection on TRR with SV-VATS.

Silva cumulative score and its relationship with prognosis in Endocervical adenocarcinoma.

BACKGROUND: The Silva system has been demonstrated to have a good predictive value of lymph node metastasis (LNM) in endocervical adenocarcinoma (EAC). Tumours were classified based on the highest identified pattern of invasion in this system, this may not exactly reflect the true situation when it presents with a "mixed pattern" in some cases. Recent study has shown that patients with lymphovascular invasion (LVI) have worse prognosis in EAC. Here we design a Silva cumulative score (SCS) system which also combined the LVI status to explore its prognostic role in EAC patients. METHODS: A total of 120 patients with EAC were included in this study. Clinicopathological characteristics were retrospectively retrieved from the medical records and follow-up data were obtained. The clinicopathological information included age at diagnosis, depth of invasion (DOI), LNM, LVI, Silva classification, and SCS. SCS is a classification system based on the sum score of different Silva pattern which is founded on morphological phenomena. The relationships between the pathological characteristics and prognoses were analyzed. RESULTS: According to the Silva system, 11 (9.2%), 22 (18.3%) and 87 (72.5%) patients had patterns A, B, and C, respectively. Patients with pattern C had the highest incidence of LVI and LNM (p < 0.05). Although the Kaplan-Meier curves demonstrated that survival decreased with increasing Silva classification for A-C cancers, there was no statistically significant difference [disease-free survival (DFS): p = 0.181; overall survival (OS): p = 0.205]. There were 45 cases presented as mixed-type of Silva patterns. According to the SCS, 23 cases (19.2%) were rated as grade I, 31 cases (25.8%) as grade II and 66 (55.0%) cases as grade III. Patients with SCS grade III had the highest incidence of LVI and LNM (p < 0.05). Kaplan-Meier analysis revealed that patients with higher SCS had significantly shorter DFS and OS than those with lower SCS (p < 0.05). High SCS was an independent predictor of poorer OS and DFS (p < 0.05) in patients with EAC. CONCLUSIONS: The application of the Silva system could effectively predict the LNM of patients and may be helpful in selecting an appropriate surgical procedure. The SCS system we designed showed a good predictive value for DFS and OS in EAC.

Giant nodular fasciitis originating from the humeral periosteum: A case report.

BACKGROUND: Nodular fasciitis (NF) is a self-limiting tumor that mostly occurs in the subcutaneous superficial fascia. NF originating from the appendicular periosteum is extremely rare. A large NF lesion of periosteal origin can be misdiagnosed as a malignant bone tumor and may cause overtreatment. CASE SUMMARY: A right axillary mass was found in a 46-year-old man and was initially diagnosed intraoperatively as low-grade sarcoma, but later diagnosed as NF after post-resection histopathological evaluation. Furthermore, fluorescence in situ hybridization analysis revealed a USP6 gene rearrangement that confirmed the diagnosis. To the best of our knowledge, this is the first case of NF in the humeral periosteum. CONCLUSION: NF poses a diagnostic challenge as it is often mistaken for sarcoma. Postoperative histopathological examination of whole sections can be combined with immunohistochemical staining and, if necessary, the diagnosis can be confirmed by molecular detection, and thus help avoid overtreatment.

microRNA-200c-3p suppresses proliferation and invasion of nephroblastoma cells by targeting EP300 and inactivating the AKT/FOXO1/p27 pathway.

miR-200c-3p is aberrantly expressed in numerous cancers, but its underlying mechanisms in nephroblastoma are unknown. In our study, the differentially regulated miRNAs between the nephroblastoma tissues and adjacent non-neoplastic renal tissues were screened based on microarray analysis. The miR-200c-3p expression in nephroblastoma tissues and cells was detected by qRT-PCR. Then, the effects of miR-200c-3p mimic or inhibitor on cell proliferation, invasion, and migration were evaluated by CCK-8 assay, plate colony formation assay, soft agar assay, Transwell, and wound-healing assay in SK-NEP-1 and G401 cells. Afterward, the target gene of miR-200c-3p was predicted by TarBase, miRTarBase, miRDB softwares, and then verified by dual-luciferase reporter gene assay. The in vivo effects of miR-200c-3p on pathological changes and tumor volume were investigated in tumor xenograft mice by H&E staining and in vivo fluorescence imaging. ChIP assay was used to evaluate the relationship between histone acetyltransferase E1A-binding protein p300 (EP300) and P27, and the relationship of the role of miR-200c-3p in nephroblastoma and the AKT/FOXO1/p27 signaling pathways was evaluated by western blotting. Our study shows that miR-200c-3p was downregulated in nephroblastoma tissues and cells, and EP300 was a target gene of miR-200c-3p. Furthermore, miR-200c-3p mimic decreased cell proliferation and inhibited cell migration and invasion in nephroblastoma. Mechanistically, miR-200c-3p could inhibit p-AKT activity and enhance p-FOXO1 and p27 expression. Notably, the transcription factor P27 could bind to the EP300 promoter. This study demonstrates a new approach to treat nephroblastoma.

Ubiquitin C-terminal hydrolase-L1 expression in non-small-cell lung cancer and its association with clinicopathological features and prognosis.

UbiquitinC-terminal hydrolase-L1 (UCH-L1) is a cysteine hydrolase. It functions as a ubiquitin hydrolase, stabilizes the ubiquitin monomer, and affects cell division through cell cycle protein deubiquitination. Abnormal UCH-L1 expression is closely related to the occurrence and development of several tumors. Although some in vitro studies have demonstrated the significance of UCH-L1 in non-small-cell lung cancer (NSCLC), only few clinical studies have focused on the UCH-L1 expression in NSCLC, and the results are controversial and non-uniform. We investigated the UCH-L1 expression in 401 cases of surgically resected NSCLC, including 286 cases of adenocarcinoma (ADC) and 65 cases of squamous cell carcinoma. The associations between the UCH-L1 expression and clinicopathological features, programmed cell death-ligand 1 (PD-L1) expression, and prognostic significance were analyzed. For NSCLC, the UCH-L1 expression is associated with sex, smoking history, tumor size (>3 cm), lymphocyte infiltration, advanced pathological stages, and shortened overall survival (OS; 89.72 vs. 114.55 months; P = 0.005), but not PD-L1 expression. The UCH-L1 expression in ADC is associated with advanced pathological stages, pleural invasion, and shortened OS (90.38 vs. 118.55 months; P = 0.010). Multivariate analysis confirmed that UCH-L1 expression was an independent poor prognostic factor for NSCLC (OS: hazard ratio [HR], 1.854; 95% confidence interval [CI], 1.132-3.038; P = 0.014). Our results suggest that the UCH-L1 expression differs across tumors with different clinicopathological features, and it is related to poor prognosis.

Histopathologic features from preoperative biopsies to predict spread through air spaces in early-stage lung adenocarcinoma: a retrospective study.

BACKGROUND: Although spread through air spaces (STAS) is a robust biomarker in surgically resected lung cancer, its application to biopsies is challenging. Moreover, limited resection is not an effective treatment for STAS-positive lung adenocarcinoma. This study aimed to identify histologic features from preoperative percutaneous transthoracic needle biopsies (PTNBs) to predict STAS status in the subsequently resected specimens, and thus help in selecting the surgical extent. METHODS: Between January 2014 and December 2015, 111 PTNB specimens and subsequent resection specimens from consecutive lung adenocarcinoma patients were retrospectively examined. Histopathologic features of PTNB specimens and presence of STAS in subsequent resection specimens were evaluated and correlations between them were analyzed statistically. RESULTS: The study participants had a mean age of 59 years (range, 35-81) and included 50 men and 61 women. Thirty-six patients were positive for STAS whereas 75 were negative. The micropapillary/solid histologic subtypes of lung adenocarcinoma (26 of 39; 66.7%; P <  0.001), necrotic/tumor debris (31 of 42; 73.8%; P <  0.001), intratumoral budding (ITB) (20 of 33; 60.6%; P <  0.001), desmoplasia (35 of 41; 85.4%; P <  0.001), and grade 3 nuclei (12 of 14; 85.7%; P <  0.001) were more common in STAS-positive tumors. Micropapillary/solid histologic subtype (OR, 1.35; 95% CI: 1.06, 1.67), ITB (OR, 1.64; 95% CI: 1.09, 2.83), desmoplasia (OR, 1.83; 95% CI: 1.36, 3.12), and N stage (N1 stage: OR, 1.37; 95% CI: 1.19, 1.87) (N2 stage: OR, 1.29; 95% CI: 1.07, 1.73) were independent predictors of STAS. CONCLUSIONS: Micropapillary/solid histologic subtype, ITB, and desmoplasia in preoperative PTNB specimens were independently associated with STAS in the subsequent resection specimens. Therefore, these can predict STAS and may help to optimize therapeutic planning.

PD-L1 expression and immune stromal features in HPV-independent cervical adenocarcinoma.

AIMS: Human papilloma virus (HPV)-independent cervical adenocarcinoma (CA) is usually diagnosed at an advanced stage, while the therapeutic options are limited. Therefore, effective treatment options are required. The programmed cell death 1 (PD-1) inhibitor pembrolizumab has been approved for the treatment of patients with recurrent or metastatic cervical squamous cell carcinoma expressing PD-ligand 1 (PD-L1). However, no data regarding PD-L1 expression in HPV-independent CA are available. Thus, we evaluated the association between PD-L1 expression and the clinicopathological characteristics and survival of patients with HPV-independent CA. METHODS: We evaluated PD-L1, mismatch repair (MMR) protein expression and the immune stromal features of 44 patients with HPV-independent CA. PD-L1 expression was defined as a combined positive score (CPS) ≥1 and a tumour proportion score (TPS) ≥1%. RESULTS: PD-L1 expression was observed in 14 cases (31.8%) with CPS ≥1 and 12 cases (27.3%) with TPS ≥1%. PD-L1 expression, based on either the CPS or the TPS, was associated with a high tumour-infiltrating lymphocyte percentage (CPS = P < 0.001; TPS = P < 0.001). Patients with a PD-L1 CPS ≥1 showed worse progression-free survival and overall survival than PD-L1-negative patients (P = 0.004 and P = 0.023, respectively). Forty-two cases demonstrated intact MMR expression and two cases demonstrated loss of MSH2/MSH6. CONCLUSIONS: Our data demonstrated that PD-L1 was expressed in HPV-independent CA, especially in clear cell carcinoma, and that PD-L1 expression is a negative prognostic marker. Our data support the role of PD-L1 in HPV-independent CA and its potential as an immunotherapeutic target.

Diagnostic Challenge of Sarcomatoid Variant of ALK-Positive Anaplastic Large Cell Lymphoma: Case Report and Updated Systematic Literature Review.

The sarcomatoid variant of anaplastic large cell lymphoma is an extremely rare histologic pattern of anaplastic large cell lymphoma that consists of spindle-shaped neoplastic cells and is easily misdiagnosed as a soft tissue sarcoma. We report a case of the sarcomatoid variant of anaplastic large cell lymphoma that was initially diagnosed as an inflammatory myofibroblastic tumor in our hospital and as liposarcoma after consultation. This article analyzed the features of this entity by reviewing the literature. Only 15 cases have been reported, most of which were misdiagnosed as sarcoma, sarcomatoid carcinoma, or inflammatory myofibroblastic tumor. Most of the reported cases showed a myxoid stroma, with a variable number of inflammatory cells. The hallmark cells usually can be found by careful evaluation of the slides. Immunohistochemistry including CD30, EMA, and ALK are the most useful for diagnosis. Most are III or IV stage, and have a good prognosis after chemotherapy.

YAP increases response to Trastuzumab in HER2-positive Breast Cancer by enhancing P73-induced apoptosis.

The role of the Yes-associated protein (YAP) in oncogenesis and progression of breast cancer remains controversial. Meanwhile, development of therapeutic resistance to trastuzumab, a common breast cancer treatment administered after chemotherapy, is a significant challenge in the treatment of HER2-positive breast cancer. We, therefore, analyzed the role of YAP in trastuzumab resistance in HER2-positive-breast carcinoma cells in vitro and evaluated the status of YAP and related proteins in patient-derived breast carcinoma tissues by immunohistochemistry. YAP expression was observed in both BT474-TS (trastuzumab-sensitive) and BT474-TR (trastuzumab-resistant) cells. Treatment with trastuzumab increased expression of nuclear-YAP (N-YAP) in BT474-TS cells, whereas BT474-TR cells showed a decrease in N-YAP expression following trastuzumab treatment. YAP silencing significantly reduced trastuzumab-induced inhibitory effects in BT474-TS cells. YAP-silenced cells also showed decreased apoptosis and significantly lower p73 levels following trastuzumab treatment. Combined protein kinase B (AKT) inhibitor-trastuzumab treatment significantly inhibited BT474-TR cell proliferation, resulting in increased N-YAP and p73 expression, as well as apoptosis. In both paclitaxel, doxorubicin and cyclophosphamide (TAC)-treated, and docetaxel, carboplatin, and trastuzumab (TCbH)-treated groups; the pathological complete response (pCR) ratios were inversely correlated with p-AKT status in biopsy specimens, while YAP and p73 status were positively correlated with the pCR ratio in the biopsy specimens of the TCbH group. Our results show that YAP is involved in trastuzumab resistance in HER2-positive breast carcinoma cells and that YAP and AKT may be developed as prognostic markers of neoadjuvant trastuzumab therapy in patients with HER2-positive breast cancer.

Comprehensive analysis of spread through air spaces in lung adenocarcinoma and squamous cell carcinoma using the 8th edition AJCC/UICC staging system.

BACKGROUND: This study aimed to comprehensively investigate the effect of spread through air spaces (STAS) on clinicopathologic features, molecular characteristics, immunohistochemical expression, and prognosis in lung adenocarcinomas (ADC) and squamous cell carcinomas (SQCC) based on the 8th edition AJCC/UICC staging system. METHODS: In total, 303 ADC and 121 SQCC cases were assessed retrospectively. Immunohistochemical staining was performed for E-cadherin, vimentin, Ki67, survivin, Bcl-2, and Bim. Correlations between STAS and other parameters were analyzed statistically. RESULTS: STAS was observed in 183 (60.4%) ADC and 39 (32.2%) SQCC cases. In ADC, the presence of STAS was associated with wild-type EGFR, ALK and ROS1 rearrangements, low E-cadherin expression, and high vimentin and Ki67 expression. In SQCC, STAS was associated with low E-cadherin expression and high vimentin and survivin expression. Based on univariate analysis, STAS was associated with significantly shorter disease-free survival (DFS) and overall survival (OS) in ADC. In SQCC, STAS tended to be associated with shorter OS. By multivariate analysis, STAS was an independent poor prognostic factor in ADC for DFS but not OS. Stratified analysis showed that STAS was correlated with shorter DFS for stage I, II, IA, IB, and IIA ADC based on univariate analysis and was an independent risk factor for DFS in stage I ADC cases based on multivariate analysis. CONCLUSIONS: Our findings revealed that STAS is an independent negative prognostic factor for stage I ADC using the new 8th edition AJCC/UICC staging system. Stage I patients with STAS should be followed up more closely and might need different treatment strategies.

Spread Through Air Spaces (STAS) in Lung Cancer: A Multiple-Perspective and Update Review.

BACKGROUND: Spread through air spaces (STAS) is a spreading phenomenon of lung cancers, which is defined as tumor cells within air spaces in the lung parenchyma beyond the edge of the main tumor. To date, several articles have reviewed the studies concerning the significance of STAS; however, most articles focused on the prognosis without summarizing the significance of STAS on other aspects. In this review, we comprehensively summarized the current literature related to STAS, so as to explore the clinical significance of STAS from multiple perspectives. MAIN BODY: This section provided a comprehensive overview of the significance of STAS from multiple perspectives and summarized current controversies and challenges in the diagnosis and clinical application. CONCLUSION: STAS is a conspicuous spreading phenomenon of lung cancers indicating worse prognosis; nevertheless, the treatment strategy for patients with STAS remains to be discussed. Further studies are needed to elaborate whether a STAS-positive patient who underwent limited resection needs a second operation or postoperative adjuvant treatment. Meanwhile, the internal mechanism of STAS formation is largely undiscovered. Whether the capability of detachment-migration-reattachment in STAS tumor cells is achieved at the time of primary tumorigenesis or in the progress of tumor development needs to be studied, and the related signal pathways or genetic alterations need to be explored. With this information, it may be possible to improve the prognosis of patients with STAS-positive lung cancers.

Desmoplastic Reaction and Tumor Budding in Cervical Squamous Cell Carcinoma are Prognostic Factors for Distant Metastasis: A Retrospective Study.

PURPOSE: An accurate risk assessment system for disease metastasis or recurrence could improve the cancer management practice in cervical squamous cell carcinoma (CxSCC) patients, which has few definite prognostic predictors. Previous studies have indicated the important utility of stromal features in determining cancer biological behavior; however, it lacks histopathologic or morphologic criteria for its evaluation. Therefore, this present study aimed to comprehensively catalog histopathological features of mesenchymal stroma to determine the prognostic value of these features in CxSCC. PATIENTS AND METHODS: We histologically and immunohistochemically evaluated the stromal features in the primary tumors of 122 CxSCC patients. The follow-up duration was 41.25 months (range: 3-80.77 months). Multivariate proportional hazard regression models were used to identify the top classifier for distant metastasis-free survival (DMFS) prediction. RESULTS: Lymph-vascular invasion (LVI), lymph node metastasis (LNM), tumor-node-metastasis (TNM) stage and tumor budding were positively correlated with distant metastasis (P < 0.001, P < 0.001, P < 0.001 and P = 0.012, respectively). Distant metastasis was also associated with the immature desmoplastic reaction (DR) (P = 0.002), high level of cancer-associated fibroblasts (P = 0.003), vasohibin-1 (VASH1)-positive microvessels (P = 0.027), and the VASH1/CD31 ratio (P = 0.004). Multivariate COX proportional hazard regression models revealed that LVI, LNM, and DR were independent predictors of poor DMFS in CxSCC patients. CONCLUSION: Primary tumor histologic stromal features, especially DR, may be useful in predicting distant metastasis in patients with CxSCC.

Clinicopathologic Features and Genetic Alterations in Adenocarcinoma In Situ and Minimally Invasive Adenocarcinoma of the Lung: Long-Term Follow-Up Study of 121 Asian Patients.

BACKGROUND: Adenocarcinoma in situ (AIS) and minimally invasive adenocarcinoma (MIA) are both small tumors with good prognosis after surgical resection, and most of them present as ground glass opacities (GGOs) on computed tomography (CT) screening. However, the differences in clinicopathologic features and genetic alterations between AIS and MIA are poorly elaborated, and few studies have evaluated the prognosis of MIA with different invasive components. Meanwhile, the histological features of lung lesions presenting as unchanged pure GGOs are barely understood. METHODS: Clinicopathologic features and genetic alterations of AIS (n = 59) and MIA (n = 62) presenting as GGOs were analyzed. Long-term preoperative observation (ranging from 2 to 1967 days) and postoperative follow-up (ranging from 0 to 92 months) was conducted. RESULTS: The tumor size and consolidation/tumor ratio were significantly larger in the MIA cohort than those in the AIS cohort both on CT and microscopy images. Immunohistochemically, the expression of p53, Ki67, and cyclin D1 was higher in MIA than in AIS. The EGFR mutation rate was significantly higher in MIA, while other genetic alterations showed no differences. Six MIA cases showed recurrence or metachronous adenocarcinoma and all the cases with a predominant micropapillary invasive pattern demonstrated this feature. CONCLUSIONS: The current CT measurements may be helpful in distinguishing AIS from MIA, but show limited utility in predicting the histology of unchanged pure GGOs. The invasive pattern may have an influence on the postoperative process of MIA; therefore, further studies are needed to evaluate the current diagnostic criteria and treatment strategy for MIA.

Differential Expression of PD-L1 in Central and Peripheral and TTF1-Positive and -Negative Small-Cell Lung Cancer.

Background: Central and peripheral location as well as thyroid transcription factor-I (TTF-1) expression was reported to be associated with different characteristics and prognosis of small-cell lung cancer (SCLC). This study aimed to investigate differential expression of PD-L1 in different SCLC subtypes, and in biopsy and resection specimens. Methods: We retrospectively analyzed 142 SCLC tumor samples using immunohistochemistry to correlate PD-L1 (22C3) expression with clinicopathologic features and survival data. Results: PD-L1 expression was found in 19.7% SCLCs (28/142) and was more frequent in females than in males (32%, 16/50 vs. 13%, 12/92, p = 0.009), in central type than in peripheral type SCLCs (26%, 26/100 vs. 4.8%, 2/42, p = 0.003), and in TTF-1 positive than in negative SCLCs (23.8%, 25/105 vs. 8.1%, 3/37, p = 0.039). PD-L1 expression was associated with vascular (p = 0.001) and lymphatic invasion (p = 0.001). There was no significant difference in PD-L1 expression between biopsy and resection specimens. On univariate analysis, patients with PD-L1 expression had significantly shorter progression-free survival (PFS; p = 0.026) and overall survival (OS; p = 0.012). Multivariate analysis revealed that PD-L1 expression was an independent prognostic factor for OS (HR, 2.317; 95% CI 1.199-4.478; p = 0.012) and PFS (HR, 1.636; 95% CI 0.990-2.703; p = 0.051) in SCLC. Conclusions: PD-L1 expression was more frequent in central type, TTF-1 positive SCLCs, and predicted a poor clinical outcome in these patients. Therefore, tumor location and TTF-1 expression could predict expression status of PD-L1, and could potentially serve as clinical response to immunotherapy.

Immune stromal features in cervical squamous cell carcinoma are prognostic factors for distant metastasis: A retrospective study.

AIM: Malignant tumors are complex structures that must interact with the surrounding environment for growth and invasiveness. This study aimed to comprehensively catalogue the features of immune cell stromal infiltrates within tumor tissue and peri-tumoral tissue and to determine whether these features have prognostic value in cervical squamous cell carcinoma (CxSCC). METHODS: Immune stromal features in primary tumors in 122 patients enriched for CxSCC were histologically and immunohistochemically characterized. RESULTS: Distant metastasis was positively correlated with tumor-node-metastasis (TNM) stage (P < 0.001), lymph-vascular invasion (LVI) (P < 0.001), lymph node metastasis (LNM) (P < 0.001), and tumor budding (P = 0.012). Distant metastasis was also associated with the eosinophil infiltration (P = 0.006); Stromal, intratumoral, invasive-margin, squamous intraepithelial lesion (SIL), and perivascular tumor-infiltrating lymphocytes (TILs); CD68+, CD163+, and CD204+ macrophage infiltration. Multivariate proportional hazard regression analyses revealed that LVI; TNM stage; lymph node metastasis; tumor budding; eosinophil infiltration; CD163+ macrophage infiltration; and stromal and intratumoral TILs were independent predictors of poor DMFS in patients with CxSCC. CONCLUSION: Primary tumor immune stromal features can be useful in predicting distant metastasis in CxSCC.

Uterine lesions with sex cord-like architectures: a systematic review.

BACKGROUND: Sex cord-like elements are rarely observed in uterine lesions, but these morphological patterns could appear in a variety of uterine tumors and non-tumorous lesions. In this review, we collected the literatures regarding the uterine tumorous and non-tumorous lesions containing sex cord-like elements and summarized these lesions in terms of clinicopathological, immunohistochemical, and molecular features in order to further understand these lesions and provide some new ideas for differential diagnosis. MAIN BODY: This section provides a comprehensive overview of the clinicopathological, immunohistochemical, and molecular features of uterine lesions with sex cord-like architectures including uterine tumors resembling ovarian sex cord tumors, endometrial stromal tumors, adenomyosis, endometrial polyps, leiomyoma, epithelioid leiomyosarcoma, adenosarcoma, sertoliform endometrioid carcinoma, corded and hyalinized endometrioid carcinoma, mesonephric adenocarcinoma, and mesonephric-like adenocarcinoma. The differential diagnosis based on morphology, immunohistochemistry, and molecular alterations has also been discussed. CONCLUSION: The sex cord-like areas in these lesions show heterogeneous but similar morphological features. Additionally, immunohistochemical staining plays a limited role in differential diagnosis. Furthermore, it is of significance for pathologists to better understand these lesions in order to avoid confusion and mistakes during pathological diagnosis, especially in a biopsy/curettage specimen.

Foci of spindle cell proliferation in multinodular goiter of thyroid: epithelial-mesenchymal transformation or embryonic remnants?

Foci of spindle cell proliferation of the thyroid gland have been documented in adenoma and carcinoma, but not much in multinodular goiter. We report a case of spindle cell proliferation detected in multinodular goiter in a 61-year-old female. Histological examination revealed foci of solid area around the normal thyroid follicles. There were two components in this solid area; the first one was composed of epithelial cells with small bland ovoid nuclei and the second one with spindle cells with short spindle-shaped nuclei. Immunohistochemical analysis revealed that the spindle cells were positive for thyroid transcription factor (TTF)-1, Vimentin, CK (AE1/AE3), and negative for p63, etc. The cells with ovoid nuclei had more abundant CK (AE1/AE3) immunoreactivity than those with short spindle-shaped nuclei. In addition, the transition between these two cell types was clearly identified. We hypothesized that this area represented embryonic remnant of developing thyroid gland and therefore evaluated histological features of developing fetal thyroid but this lesion by no means simulated histological features of any developing stages of fetal thyroid gland. The spindle cell foci of thyroid gland could possibly arise from epithelial-mesenchymal transformation of thyroid follicular epithelium in this thyroid gland but it awaits further investigations for clarification.