Distal-type bronchiolar adenoma of the lung expressing p16INK4a - morphologic, immunohistochemical, ultrastructural and genomic analysis - report of a case and review of the literature

Pseudocavity on Thin-slice CT Can Be a Suggestion of Bronchiolar Adenoma: A Preliminary Study on 80 Cases With Bronchiolar Adenoma of the Lung

OBJECTIVES

At present, the study of bronchiolar adenoma (BA) mainly focuses on its pathologic characteristics, but there is limited understanding of its clinical manifestations and imaging signs. This article aims to summarize the clinical manifestations and imaging features of 80 cases of BA, with the goal of achieving a comprehensive and systematic understanding of BA.

MATERIALS AND METHODS

We retrospectively analyzed 80 patients with BA confirmed by surgical pathology in our hospital. All subjects underwent thin-slice CT examination. The basic information, tumor history, clinical manifestations, and CT imaging features of the lesions were collected. The subjects' age, maximum diameter of BA, and shortest distance from the pleura were analyzed by t-test or 1-way ANOVA, while other clinical and radiologic characteristics were compared for differences among different BA types by the χ2 test or Fisher exact probability method.

RESULTS

The majority of the 80 patients were female, with an average age of 59.08±10.16 years. The majority of them do not manifest any clinical symptoms. All lesions are located in the subpleural area, including 63 cases in the lower lobe of the lungs. The average size of the tumors was 10.31±5.01 mm. The majority of the lesions exhibited irregular morphology (53 cases, 66.25%) and predominantly comprised solid nodules (46 cases, 57.50%). There were statistically significant differences in lesion morphology, boundary, and pseudocavity among pure ground-glass nodular BA, mixed ground-glass nodular BA, and solid density nodular BA. Compared with pure ground-glass density BA (1 case, 1.25%) and mixed ground-glass density BA (7 cases, 8.75%), the boundary of solid nodules BA (42 cases, 52.50%) was significantly clearer (P<0.001). The presence of pseudocavity was found to be significantly higher in individuals with solid nodules compared with those with pure ground-glass nodules (P<0.0167). Compared with BA without pseudocavity, BA with pseudocavity exhibited a clearer lung interface (P<0.001), more abnormal vessel signs (P=0.007), and a higher incidence of malignant preoperative diagnosis (P=0.020).

CONCLUSIONS

BA mostly occurs in middle-aged and elderly women without any clinical symptoms. The imaging manifestations of BA are diverse, mainly presenting as irregular solid nodules. The interface between the tumor and lung is clear, and pseudocavity formation is common. In addition, BA with pseudocavity often exhibits abnormal vascular signs, which can lead to misdiagnosis as malignancy before surgery.

Study on temperature change and nursing intervention of patients undergoing thoracoscopic surgery in lung tumor treatment

To investigate the changes of body temperature and nursing intervention of patients undergoing thoracoscopic surgery in lung tumor treatment. A total of 100 patients with lung cancer admitted to our hospital from January 2021 to January 2023 were selected as research objects, and were divided into control group and study group, with 50 cases in each group according to different treatment methods. All patients received thoracoscopic surgery, the control group received routine nursing, and the research group received perioperative nursing intervention on the basis of the above, and observed and compared the temperature changes, perioperative complications, postoperative rehabilitation, stress indexes and pain degree of the 2 groups of patients. The temperature at T1, T2, T3, and T4 was lower than that at T0, and the temperature at T3 was the lowest. The temperature at T1, T2, T3, and T4 in the study group was significantly higher than that in the control group (P < .05). The incidence of perioperative hypothermia, hypoxemia, chills, and agitation in study group was significantly lower than that in control group (P < .05). The anal exhaust time, consciousness recovery time, tracheal extubation time, operating room time, and hospital stay time in the study group were significantly shorter than those in the control group (P < .05). After operation, the levels of AD, NA, and Cor in both groups were higher than those before operation, and the levels of AD, NA, and Cor in the study group were significantly lower than those in the control group (P < .05). The visual analogue scale scores of the 2 groups at 12 hours and 48 hours after operation were lower than those of the control group at 6 hours, 12 hours, and 48 hours after operation, and the visual analogue scale scores of the study group at 6 hours, 12 hours, and 48 hours after operation were significantly lower than those of the control group (P < .05). Nursing intervention during thoracoscopic surgery for lung tumors can stabilize intraoperative and postoperative temperature changes, alleviate stress reaction and pain, reduce the risk of intraoperative hypothermia and hypoxemia, promote the smooth progress of surgery and improve prognosis.

Bronchiolar adenoma/ciliated muconodular papillary tumor complicated by lymphoid interstitial pneumonia in a patient with Sjögren's disease: A case report and systematic review

Bronchiolar adenoma (BA)/ciliated muconodular papillary tumor (CMPT) is a rare pulmonary neoplasm, with less than 150 cases documented in the literature. We report a unique case of BA/CMPT complicated by lymphoid interstitial pneumonia (LIP) in a 55-year-old male with Sjögren's disease. This is the first documented instance of such a comorbidity. Through a systematic review of PubMed, we also summarize the demographic, clinical, radiological, histopathological, and treatment characteristics of CMPT.

Distinctive field effects of smoking and lung cancer case-control status on bronchial basal cell growth and signaling

RATIONAL

Basal cells (BCs) are bronchial progenitor/stem cells that can regenerate injured airway that, in smokers, may undergo malignant transformation. As a model for early stages of lung carcinogenesis, we set out to characterize cytologically normal BC outgrowths from never-smokers and ever-smokers without cancers (controls), as well as from the normal epithelial "field" of ever-smokers with anatomically remote cancers, including lung adenocarcinoma (LUAD) and squamous cell carcinoma (LUSC) (cases).

METHODS

Primary BCs were cultured and expanded from endobronchial brushings taken remote from the site of clinical or visible lesions/tumors. Donor subgroups were tested for growth, morphology, and underlying molecular features by qRT-PCR, RNAseq, flow cytometry, immunofluorescence, and immunoblot.

RESULTS

(a) the BC population includes epithelial cell adhesion molecule (EpCAM) positive and negative cell subsets; (b) smoking reduced overall BC proliferation corresponding with a 2.6-fold reduction in the EpCAMpos/ITGA6 pos/CD24pos stem cell fraction; (c) LUSC donor cells demonstrated up to 2.8-fold increase in dysmorphic BCs; and (d) cells procured from LUAD patients displayed increased proliferation and S-phase cell cycle fractions. These differences corresponded with: (i) disparate NOTCH1/NOTCH2 transcript expression and altered expression of potential downstream (ii) E-cadherin (CDH1), tumor protein-63 (TP63), secretoglobin family 1a member 1 (SCGB1A1), and Hairy/enhancer-of-split related with YRPW motif 1 (HEY1); and (iii) reduced EPCAM and increased NK2 homeobox-1 (NKX2-1) mRNA expression in LUAD donor BCs.

CONCLUSIONS

These and other findings demonstrate impacts of donor age, smoking, and lung cancer case-control status on BC phenotypic and molecular traits and may suggest Notch signaling pathway deregulation during early human lung cancer pathogenesis.

Bronchiolar adenoma/ciliated muconodular papillary tumour: advancing clinical, pathological, and imaging insights for future perspectives

Bronchiolar adenoma/ciliated muconodular papillary tumour (BA/CMPT) is a benign peripheral lung tumour composed of bilayered bronchiolar-type epithelium containing a continuous basal cell layer; however, the similarities in imaging and tissue biopsy findings at histopathology between BA/CMPT and malignant tumours, including lung adenocarcinoma, pose significant challenges in accurately diagnosing BA/CMPT preoperatively. This difficulty in differentiation often results in misdiagnosis and unnecessary overtreatment. The objective of this article is to provide a comprehensive and systematic review of BA/CMPT, encompassing its clinical manifestations, pathological basis, imaging features, and differential diagnosis. By enhancing healthcare professionals' understanding of this disease, we aim to improve the accuracy of preoperative BA/CMPT diagnosis. This improvement is crucial for the development of appropriate therapeutic strategies and the overall improvement of patient prognosis.

Bronchiole adenoma/pulmonary ciliated mucinous nodular papillary tumor: Case series and literature review

OBJECTIVE

To analyze the clinical-pathological characteristics of 3 cases of bronchiolar adenoma/pulmonary ciliary mucinous nodular papillary tumors, and to improve the understanding of bronchiolar adenoma (BA)/ciliated muconodular papillary tumors (CMPT) (bronchiolar adenoma/ciliated muconodular papillary tumor).

METHODS

Retrospective analysis was done on the clinical information, diagnosis, and treatment of 3 instances of BA/CMPT at the Second People's Hospital of Weifang City. By scanning the CNKI, Wanfang, VIP database, and Pubmed database using the English key words "bronchiolar adenoma, ciliated muconodular papillary tumor," respectively patients with comprehensive clinical data were gathered, and studies from January 2002 to August 2021 that were relevant to the patients were examined.

RESULTS

A total of 35 articles and 71 instances were found, including 3 cases in our hospital, for a total of 74 cases. There were 31 males and 43 females among them, ranging in age from 18 to 84 years (average 63 years), and 15 cases had a smoking history. The majority of them were discovered by physical examination and had no clinical symptoms. The majority of the imaging revealed solid nodules with variable forms, with some ground-glass nodules displaying vacuole and bronchial inflation signs. BA/CMPT are generally gray-white, gray-brown solid nodules with obvious boundaries but no envelope with a maximum dimension of 4 to 45 mm (average 10.6 mm) on gross examination. Acinar, papillary, and lepidic formations can be seen under the microscope at high magnification; the majority of these structures are made up of tripartite epithelial components, including basal cells, mucous cells, ciliated columnar cells, and alveolar epithelial cells, demonstrating a variety of combinations. An important basis for diagnosis in immunohistochemistry is the continuous positive basal cell layer that is shown by p63, p40, and CK5/6. BRAF and epidermal growth factor receptor are the genes that are most frequently mutated. All of the patients showed no signs of metastasis or recurrence during follow-up period.

CONCLUSION

BA/CMPT is a rare benign tumor of lung epithelium. Because imaging and intraoperative cryosection diagnosis are easy to be misdiagnosed as malignant, it is necessary to further improve understanding and improve immunohistochemistry and genetic examination.

Multiple bronchiolar adenomas/ciliated muconodular papillary tumors of the bilateral lung with tumor budding and potential malignant transformation into squamous cell carcinoma: a case report and literature review

Background

Bronchiolar adenoma (BA)/ciliated muconodular papillary tumor (CMPT) is a rare lung tumor characterized by ciliated, mucous and basal cells. Recently, some cases of driver mutations or malignant transformations have been reported. However, the nature of BA/CMPT remains controversial. Here, we report a case of bilateral pulmonary multiple BAs with tumor budding and squamous metaplasia.

Case Description

A 55-year-old man presented with multiple small nodules in the lower lobes of the bilateral lungs on physical examination 7 years prior. During the past 3 years of regular follow-up, some nodules had slightly enlarged. Because the nodules were mostly solid, the patient underwent video-assisted thoracoscopic segmentectomy of the left lower lung. A postoperative pathological diagnosis of BA was made. In all lesions, the fusion and mutation of major driver genes were not detected by next-generation sequencing (NGS). No recurrence or metastasis was observed after 37 months of follow-up. Notably, all five resected lesions were BA/CMPT, and one lesion was accompanied by squamous metaplasia and tumor budding.

Conclusions

Our report found that BA/CMPT with squamous metaplasia and tumor budding has the potential to transform into lung squamous cell carcinoma, expanding its connection with malignant transformation. Smoking may be one of the risk factors. We also found that BA/CMPT can be multiple lesions rather than a solitary lesion.

Ciliated muconodular papillary tumor of the lung: a case report and literature review

Background

Ciliated Muconodular Papillary Tumor (CMPT) was first reported in 2002, and fewer than 100 cases have since been reported. The prognosis after surgical resection is good, and recurrence has not been reported. However, it is easily misdiagnosed as adenocarcinoma. Summarizing the CT features of CMPT will help doctors better understand the disease.

Case presentation

Here, we report a rare and interesting case of ciliated muconodular papillary tumor. A 6-mm diameter solid nodule with slight lobulation, short spines, and subpleural indentation. Patients with clinical diagnosis of high-risk subpleural nodule in the left lung underwent thoracoscopic surgery. Most CMPT cases lack specific clinical manifestations and were found incidentally on physical examination or during a workup for other diseases. The disease was diagnosed through CT and biopsy, and it responded well to surgery.

Conclusions

This paper presents the detailed computed tomography features of CMPT to help prevent misdiagnosis. The typical manifestations of CMPT imaging as solid and partial nodules, nodules in subpleural or peripheral zones, and nodules contain cavities.

Mucin distribution in bronchiolar adenoma/ciliated muconodular papillary tumor reveals organoid differentiation simulating the normal lung

Bronchiolar adenoma/ciliated muconodular papillary tumor is a lung neoplasm exhibiting various degrees of proximal and distal bronchiolar differentiation. Here, we evaluated distribution of MUC5AC and MUC5B in bronchiolar adenoma/ciliated muconodular papillary tumor for comparison with that seen in normal respiratory tract. In normal respiratory tract, MUC5AC was mainly distributed in large bronchi, while MUC5B was distributed in bronchi, bronchioles, and submucosal glands. In bronchiolar adenoma/ciliated muconodular papillary tumor, MUC5AC was primarily distributed in luminal cells of large airspaces, and MUC5B was distributed in luminal cells of small airspaces and mucinous glands, in addition to large airspaces, regardless of distal or proximal differentiation. In particular, MUC5B was distributed in non-mucinous club and ciliated cells in both the normal respiratory tract and bronchiolar adenoma/ciliated muconodular papillary tumor. These results indicate that MUC5AC and MUC5B distribution in bronchiolar adenoma/ciliated muconodular papillary tumor is similar to that seen in normal respiratory tract, suggestive of organoid differentiation simulating the normal lung.

A clinicopathologic and molecular analysis of five cases of bronchiolar adenoma with rare mutations

Bronchiolar adenoma (BA) is a rare benign lung tumor that shows proliferation of bland bronchiolar-type epithelium containing a continuous layer of basal cells. This tumor entity has been newly added to the recent World Health Organization (WHO) classification 5th edition. This entity encompasses a spectrum of lesions: the classic ciliated muconodular papillary tumor (CMPT) and the non-classic CMPT. Although BA is reported to have driver mutations including BRAF V600E, EGFR, and KRAS, the molecular profile of BA is still incompletely understood. Five resected BAs at our institutions were analyzed. The BA lesions were subdivided into two groups: three proximal-type BAs and two distal-type BAs. NRAS codon 12/13 mutation and EML4 exon 20-ALK exon 20 fusion were found in two of the three proximal-types. BRAF V600E mutation was found in one of the two distal-types. Two cases coexisted with lung adenocarcinoma, with EGFR exon 19 deletion and KRAS mutation, respectively. No recurrence was observed at a median of 12 months (range 2-84 months) of follow-up. BA has uncommon variants of mutation seen in lung adenocarcinoma. NRAS mutation and ALK fusion partner has not been reported previously. The present cases may reinforce the distinctive biology of BA from lung adenocarcinoma.

Bronchiolar Adenoma/Pulmonary Ciliated Muconodular Papillary Tumor

OBJECTIVES

To describe the histologic features that are helpful in the diagnosis of the rare bronchiolar adenomas/ciliated muconodular papillary tumors (BAs/CMPTs) during intraoperative consultation.

METHODS

Multi-institutional retrospective review of frozen sections of 18 BAs/CMPTs.

RESULTS

In 14 of 18 cases, BA/CMPT was the primary reason for sublobar lung resection, and in 4 cases, BA/CMPT was an incidental finding intraoperatively for resections performed for carcinoma in other lobes. There were 11 proximal-type/classic BAs/CMPTs and 7 distal-type/nonclassic BAs/CMPTs. Only 3 (16.7%) of 18 were correctly diagnosed at the time of frozen section, all of which were proximal type/classic. The remainder were diagnosed as adenocarcinoma (n = 7); invasive mucinous adenocarcinoma (n = 1); non-small cell lung carcinoma (n = 1); cystic mucinous neoplasm, favor adenocarcinoma (either mucinous or colloid type) (n = 1); favor adenocarcinoma, cannot exclude CMPT (n = 1); atypical proliferation (n = 2); mucinous epithelial proliferation (n = 1); and mucous gland adenoma (n = 1).

CONCLUSIONS

BA/CMPT can potentially be misdiagnosed as carcinoma during intraoperative consultation. On retrospective review of the frozen sections, the presence of the following may help to avoid misdiagnosis: a mixture of bland ciliated columnar cells, mucinous cells, and, most important, a basal cell layer, as well as a lack of necrosis, significant atypia, and mitoses.

Ciliated muconodular papillary tumor/bronchiolar adenoma of the lung

Ciliated muconodular papillary tumor (CMPT) is an uncommon tumor of the lung, usually detected incidentally in the peripheral lung fields on computed tomography. It is most commonly diagnosed in patients between the sixth and last decades of life. The canonical microscopic feature is a tripartite mixture of ciliated columnar, mucous, and basal cells with papillary architecture. However, studies have shown wide morphological variations in this tumor, such as a lack of ciliated columnar or mucous cells and flat instead of papillary architecture. Hence, a new umbrella term, bronchiolar adenoma (BA), has been proposed to encompass all tumors comprising a uniform layer of basal cells underneath the luminal epithelium displaying bronchiolar differentiation. Recent molecular studies on CMPT/BA discovered a high frequency of driver gene alterations, including mutations in the BRAF, EGFR, AKT1, KRAS, and HRAS genes, as well as ALK gene rearrangements. The tumor follows an indolent clinical course, as no recurrences or metastases have been reported in patients who underwent surgical resection. In this article we review the clinical, radiological, and pathological features, and molecular characteristics of CMPTs/BAs.

Expression and role of p16 and GLUT1 in malignant diseases and lung cancer: A review

Non‐small cell lung cancer (NSCLC) is the leading cause of cancer death and in most cases it is often diagnosed at an advanced stage. Many genetic and microenvironmental factors are able to modify the cell cycle inducing carcinogenesis and tumor growth. Among the metabolic and genetic factors that come into play in carcinogenesis and tumor cell differentiation and growth there are two different proteins that should be considered which are glucose transporters (GLUTs) and p16^INK4 The first are glucose transporters which are strongly involved in tumor metabolism, notably accelerating cancer cell metabolism both in aerobic and anaerobic conditions. There are different subtypes of GLUT family factors of which GLUT 1 is the most important and widely expressed. By contrast, p16 is mainly a tumor‐suppressor protein that acts on cyclin‐dependent kinase favoring cell cycle arrest in the G1 phase. Our search focused on the action of the aforementioned factors.