Importance of Histopathological Grading for Treatment Selection in Malignant Mesothelioma.

BACKGROUND: Complexities in TNM staging in epithelioid malignant pleural mesothelioma (MPM) may lead to errors in treatment selection, leading to major surgical interventions in patients with low survival expectations. METHODS: Sixty-nine stage I epithelioid MPM patients, including 27 patients treated with pleurectomy/decortication (P/D) and multimodal therapy (MMT) (the P/D [MMT] group), and 42 patients treated with chemotherapy or chemoradiotherapy (the CRT group), were included in the study. After an initial evaluation of overall survival, all patients were grouped in terms of histopathological parameters and treatment types, and then, a secondary survival evaluation was performed for the groups. RESULTS: Forty-one patients were male, the mean age was 61.8 years. The median survival time was 26 months in the P/D (MMT) group, and 19.6 months in the CRT group, but the difference was not statistically significant. After grouping according to pathological criteria, a median survival time of 32.4 ± 2.9 months in the P/D (MMT) group and 21.9 ± 3.2 months in the CRT group was obtained among patients with histopathological low-grade tumors. Among patients with high-grade tumors, the median survival time was 18.3 ± 2.6 months in the P/D (MMT) group and 17 ± 4.4 months in the CRT group. Among patients with low-grade tumors, the P/D (MMT) group had longer survival. Median survival times were similar among patients with high-grade tumors. CONCLUSION: In epithelioid MPM, histopathological grading by video-assisted thoracic surgery pleural biopsy can prove accurate in selecting patients for P/D and MMT.

Computed Tomography-Guided Methylene Blue Labeling Prior to Thoracoscopic Resection of Small Deeply Placed Pulmonary Nodules. Do We Really Need Palpation?

Background Video-assisted thoracic surgery (VATS) is widely used for thoracic surgery operations, and day by day it becomes routine for the excision of undetermined pulmonary nodules. However, it is sometimes hard to reach millimetric nodules through a VATS incision. Therefore, some additional techniques were developed to reach such nodules little in size and which are settled on a challenging localization. In the literature, coils, hook wires, methylene blue, lipidol, and barium staining, and also ultrasound guidance were described for this aim. Herein we discuss our experience with CT-guided methylene blue labeling of small, deeply located pulmonary nodules just before VATS excision. Method From April 2013 to October 2016, 11 patients with millimetric pulmonary nodules (average 8, 7 mm) were evaluated in our clinic. For all these patients who had strong predisposing factors for malignancy, an 18F-FDG PET-CT scan was also performed. The patients whose nodules were decided to be excised were consulted the radiology clinic. The favorable patients were taken to CT room 2 hours prior to the operation, and CT-guided methylene blue staining were performed under sterile conditions. Results Mean nodule size of 11 patients was 8.7 mm (6, 2-12). Mean distance from the visceral pleural surface was 12.7 mm (4-29.3). Four of the nodules were located on the left (2 upper lobes, 2 lower lobes), and seven of them were on the right (four lower lobes, two upper lobes, one middle lobe). The maximum standardized uptake values (SUV max) on 18F-FDG PET/CT scan ranged between 0 and 2, 79. Conclusion CT-guided methylene blue staining of millimetric deeply located pulmonary nodules is a safe and feasible technique that helps surgeon find these undetermined nodules by VATS technique without any need of digital palpation.

Intrathoracic neurogenic tumors.

BACKGROUND: Intrathoracic neurogenic tumors are uncommon neoplasms arising from nerve tissues. This study reports on our 24-year single-center experience with intrathoracic neurogenic tumors. PATIENTS AND METHODS: We retrospectively analyzed the postoperative pathological records of 19,378 operations performed in our clinic between January 1988 and December 2011 and included cases with diagnosis of neurogenic tumors. RESULTS: The study included 149 patients (90 females and 59 males) with an average age of 24.5 years (7 months to 77 years). The study group comprised 29 infants and children, and 120 adults. Of the patients, 72 had benign schwannomas, 10 malignant schwannomas, 17 neurofibromas, 24 ganglioneuromas, 9 ganglioneuroblastomas, 4 neuroblastomas, 9 primitive neuroectodermal tumors, and 4 paragangliomas. Concerning the location of these lesions, 131 were located in the posterior mediastinum, 8 in the lung parenchyma, 5 in the chest wall, 3 in the anterior mediastinum, and 2 in the thoracic inlet. The majority of nerve cell tumors were in infants and children (79.3%), whereas the nerve sheath tumors most commonly occurred in adults (78.3%). There were 117 benign and 32 malignant tumors across all age groups. The rate of malignancy was 41.4% in infants and children, compared with 16.7% in adults. Symptoms were seen in 65% of the adult patients and 79.3% of the infant and children patients. Seven tumors were associated with von Recklinghausen's disease. In six patients (4.0%), the tumor showed an intraspinal extension. Surgical resection of the tumor was complete in 142 of 149 patients (95.3%). CONCLUSION: The treatment of choice for malignant and benign thoracic neurogenic tumors is complete resection. The objective of resection is to avoid local invasion, facilitate differential histopathological diagnosis to determine other treatment options, and to prevent malignant degeneration.

Analysis of bronchiectasis patients who underwent video-assisted thoracoscopic surgery in a tertiary thoracic surgery center: Ten years of experience.

Background: This study aimed to analyze our video-assisted thoracic surgery (VATS) experience in the surgical treatment of bronchiectasis and the reasons limiting VATS application. Methods: Two hundred one patients (106 males, 95 females; mean age: 39.7±14.1 years; range, 12 to 68 years) who underwent surgical treatment for bronchiectasis between January 2012 and October 2021 were included in the retrospective study. Three groups were created based on the surgical technique used: VATS, thoracotomy, and patients who were converted from VATS to thoracotomy. Results: The most significant presenting symptoms were cough (43%) and excessive sputum expectoration (40%). Surgical intervention was applied to the left side of 60% of the patients, and the most common resection performed in all three groups was left lower lobectomy. The rate of conversion from VATS to thoracotomy was 28.8%, and it was found that dense pleural adhesions were the most common reason. Revision surgery was performed on a total of 11 (5.47%) patients. The frequency of revision surgery did not differ significantly among the three groups (p=0.943). The most common postoperative complication was prolonged air leakage. There was no statistically significant difference in postoperative complication rates among the groups (p=0.417). The rate of surgical treatment of bronchiectasis with VATS was observed to have increased from 11.1% to 77.7% in our clinic. Conclusion: In experienced hands, VATS can be safely applied in the surgical treatment of bronchiectasis.

Efficiency of pulmonary nodule risk scoring systems in Turkish population.

Malignancy risk calculation models were developed using the clinical and radiological features. It was aimed to compare pulmonary nodule risk calculation models and evaluate their effectiveness and applicability for the Turkish population. Between 2014 and 2019, 351 patients who were operated on for pulmonary nodules were evaluated with the following data: age, gender, smoking history, family history of lung cancer, extrapulmonary malignancy and granulomatous disease, nodule diameter, attenuation character, side, localization, spiculation, nodule count, presence of pulmonary emphysema, FDG uptake in PET/CT of the nodule, and definitive pathology data. Malignancy risk scores were calculated using the equations of the Brock, Mayo, and Herder models. The results were evaluated statistically. The mean age of the 351 patients (236 men, 115 women) was 57.84 ± 10.87 (range 14-79) years, and 226 malignant and 125 benign nodules were observed. Significant correlations were found between malignancy and age (p < 0.001), nodule diameter (p < 0.001), gender (p < 0.009), speculation (p < 0.001), emphysema (p < 0.05), FDG uptake (p < 0.001). All three models were found effective in the differentiation (p < 0.001). The ideal threshold value was determined for the Brock (19.5%), Mayo (23.1%), and Herder (56%) models. All models were effective for nodules of > 10 mm, but none of them were for 0-10 mm. Brock was effective in ground-glass nodules (p = 0.02) and all models were effective for semi-solid and solid nodules. None of the groups could provide AUC values as high as those achieved in the original studies. This suggests the need to optimize models and malignancy risk thresholds for Turkish population.

Are precautions actually a risk factor in the development of bronchopleural fistula after pneumonectomy? A retrospective analysis of 299 cases.

PURPOSE: Bronchopleural fistula most commonly occurs after pneumonectomies, with high morbidity and mortality. A preventive approach is essential. Risk factors can be classified depending on the patient, anatomy, surgical technique, and other causes. METHODS: Patients (n = 370) who underwent pneumonectomy between 2010 and 2020 were evaluated. The digital media and archive files of the patients (n = 299) were reviewed retrospectively. RESULTS: While 271 patients (90.6%) were male, 28 (9.4%) were female. The mean age was 56.63 years. The bronchopleural fistula rate was 14.7% (44/299). Serum protein deficiency, right pneumonectomy, completion pneumonectomy, bronchial manual suturing, advanced stage, prolongation of time after neoadjuvant therapy, length of drain and hospital stay, tissue support for the stump, and short bronchial stump were significant for bronchopleural fistula. Smoking in patients operated on for malignancy and low serum albumin value in benign and chronic infectious diseases were significant in terms of fistula. In patients who developed bronchopleural fistula, the 5-year survival rate was 18.4%. CONCLUSION: The most important risk factors in bronchopleural fistula depend on the surgical technique and so are completely preventable. Contrary to the literature, short stump and tissue support to the stump were found to be risk factors for fistula. In addition, the effect of the time between neoadjuvant therapy and operation should be examined in further studies.

Pulmonary Langerhans cell histiocytosis; characteristics of 11 cases.

INTRODUCTION: Pulmonary Langerhans cell histiocytosis (PLCH) is a rarely seen disease of younger population. Almost all of the patients were smoker. In this study we aimed to evaluate the characteristics, diagnosis, treatment modalities and prognosis of 11 cases with PLCH. MATERIALS AND METHODS: We retrospectively reviewed our case series of eleven patients who were pathologically diagnosed as PLCH. The median age was 35 years (19-51) and male to female ratio (M/F) was 5/6. All of the patients were symptomatic. The most common symptoms were dyspnea (81.8%) and dry cough (72.7%). Mean duration of the symptoms was 10.8 months. All patients except two of them were smoker (81.8%). All patients were also passive smokers. RESULTS: Bilateral cystic appearance (n= 9, 81.8%), interstitial findings [septal and peribronchovascular thickening (72.7%) and nodular pattern (54.5%)] were common radiological findings. Spontaneous pneumothorax was present in two cases. All patients were diagnosed with surgical biopsies (90.9%) or transbronchial parenchymal biopsy (9.1%). Smoking cessation (81.8%) and immunosupression therapy (methylprednisolone) were the treatment modalities. Mean follow-up period was 5.40 ± 1.78 years. Generally, symptoms were improved with smoking cessation or methylprednisolone therapy. One patient was readmitted to our clinic with recurrent pneumothorax. In conclusion, it should be kept in mind that passive smoking is also responsible in the pathogenesis of PLCH. CONCLUSION: Exact consensus for PLCH treatment was not present except a few recommendations. In the future, with the understanding of the pathogenesis of the disease, new therapeutic agents will be discovered for this rare condition.

Role of orthopedia homebox protein in subclassification of pulmonary carcinoid tumors: Retrospective analysis of 110 cases.

Background: Orthopedia homeobox protein (OTP), highlighted as a sensitive and specific marker for pulmonary carcinoids, may provide a more objective criterion for subclassification. Materials and Methods: A total of 110 patients who underwent surgery for pulmonary carcinoids (2009-2019) were included. Gender, age, application complaint, tumor diameter and location, typical and atypical tumor type, lymph node involvement, stage, recurrence, and survival data were evaluated retrospectively with OTP nuclear staining. Results: The sensitivity of OTP was 66.4%. OTP in subclassifying pulmonary carcinoids was not significant. There was no significant relationship between OTP and lymph node involvement, recurrence, and survival. Conclusion: OTP does not provide significant results in the subclassification of typical and atypical carcinoid tumors and the evaluation of recurrence and survival of carcinoid tumor cases.

[The third primary-the second metachronous lung cancer in the same patient]. / Ayni hastada üçüncü primer-ikinci metakron akciger kanseri.

Having more than one lung carcinoma in an organism is called as multiple primary lung carcinoma. The probability of having a second primary lung carcinoma in the same patient at the different times is very rare.Third primary lung carcinoma has not been reported in literature before. A sychronous mass was determined on a 67 years old man about eight years ago. The mass was localized on the left upper lobe and it's histologic type was squamous cell carcinoma/adenosquamous cell carcinoma (bronchioalveolar component). A left upper lobectmy was performed with a left thorocotomy. Thirty nine months after that operation a metachronous epidermoid carcinoma was determined on the right upper lobe, consequently a right upper lobectomy was performed to him. A squamous cell carcinoma was determined on the right intermedier bronch as a third time and second metachronous 49 months later after the first operation. After all he underwent chemotherapy. We reported this case because of a second metachronous tumour in the same patient has not been reported before and to emphasize the effects of postoperative follow up on the prognosis.

Small cell osteosarcoma of rib: diagnosis and treatment of the rare case.

Small cell osteosarcomas are very rare tumors which are classified as the component of Ewing's sarcoma family. Although the tumor generally is seen on long bones, short bone involvement is rare. Moreover, rib localization is quite uncommon and to the best of our knowledge, only one case has been reported so far. Herein, we described a case of rib-localized small cell osteosarcomas which was only presented with localized left sided pain. Resection surgery followed by adjuvant chemotherapy was performed. Clinico-pathological features and therapeutic approach are discussed in the light of the relevant literature.

An extremely rare case of multiple calcifying tumor of the pleura.

Calcifying fibrous tumors are uncommon lesions. These lesions are made up of hyalinized collagenous fibrotic tissues interspersed with lymphoplasmacytic infiltrates and extensive dystrophic calcifications mimicking psammomatous features. Calcifying tumor of pleura is rarely presented. Multiple calcifying tumor of pleuras have been reported extremely seldom. Forty-year-old male patient was admitted to our clinic with complaints of dyspnea. Because of the multiple soft tissue formations at the pleural region with the largest diameter of 2 cm on thorax computed tomography, surgical intervention was planed. Frozen sections of pleural biopsies that were taken during video-assisted thoracoscopic surgery were reported as calcifying fibrous tumor. Because of the presence of multiple lesions and pleural adhesions, curative pleural decortication was performed. This case is presented with extremely rare entity of multiple calcifying tumor of plevras.

Single versus multiple video-assisted thoracocopic lung biopsy for suspected interstitial lung disease: a perspective on diagnostic efficacy and length of hospital stay.

Background: Nearly one-third of the patients with interstitial lung disease (ILD) require surgical biopsy for a definite diagnosis. Video-assisted thoracoscopic surgical (VATS) biopsy has replaced open lung biopsy, but the number of biopsy required to achieve an accurate diagnose is controversial. Objectives: Our study aims to show that a well-planned single VATS biopsy is as effective as multiple biopsies for the accurate diagnosis of ILD by reduced days of hospital stay. Methods: We included 111 patients with suspected ILD who underwent VATS biopsy in our study. Patients were separated into three groups according to the number of biopsies obtained. The differences between groups for diagnostic yield, mean time for chest tube removal, perioperative complications, and approximate volume per biopsy were analyzed statistically. Results: Eighteen single, 74 double, and 19 triple biopsies were made. Mean times of chest tube removal and hospital stay for single, double, and triple biopsy were 3.5, 4.8, and 6.1 days respectively. The number of biopsy and length of hospital stay was strongly related (p = 0.02), but there was no difference for diagnostic yield between single and multiple biopsy groups (p > 0.05). There was no intraoperative complication or perioperative mortality. In postoperative period, eight patients with multiple biopsies had prolonged air leak. Conclusion: Although classical knowledge suggests multiple biopsies from different locations of the lung are essential, recent reports have shown that the site and the number of biopsy are not as effective as previously thought in achieving the diagnosis for ILD. Our results show that a "single" biopsy, decided with multidisciplinary evaluation, is an effective and safe diagnostic tool, with lesser days of hospital stay. Main novel aspects: 1. The classical knowledge that multiple biopsies should be taken from different regions of the lung in the diagnosis of interstitial lung diseases has changed over time.2. Diagnostic concordance between multiple biopsy specimens is above 85%.3. A "single" biopsy, decided with multidisciplinary evaluation, is an effective and safe diagnostic tool with lower days of hospital stay.

Video-Assisted Thoracoscopic Treatment of Coelomic Cysts.

Background: Coelomic cysts are uncommon benign cyctic lesions of the mediastinum. Complete resection of the cyst with surgical treatment is indicated depending on whether the patient is symptomatic or whether the cyst grows during follow-up, or whether the diagnosis is uncertain. Surgical treatment prevents complications, relieves symptoms, and establishes diagnosis. Video-assisted thoracoscopic surgery (VATS) is the best method for excision of these cysts. This approach is safe and effective, has low morbidity, and shortens the length of hospital stay Objectives: We aimed to analyze our experience with coelomic cysts through VATS, reviewing clinical, radiological, and pathological features, early and long-term results of surgical management. Patients and Methods: Between January 2011 and December 2018, 20 patients with coelomic cysts who underwent VATS at our clinic were included in the study. Results: The study included 11 female and 9 male patients with a mean age of 45.6 years. Symptoms were present in 17 patients and 3 were asymptomatic. The average cyst diameter was 5.4 cm (range 2-8 cm). Fourteen of them were right sided, the others were left sided. There were no operative mortality and complications. Postoperatively there were no complications, in all cases course was uneventful, all of them were discharged after a mean of 3 days (range 2-6 days). Conclusions: Considering the low complication rate and hospital stay, excision of coelomic cysts through VATS is extremely safe and comfortable, so it should be considered the primary therapeutic procedure.

First experiences and complications in video-assisted thoracoscopic surgery lobectomy at a thoracic surgery center.

BACKGROUND: This study aims to report the difficulties and complications we experienced in video-assisted thoracoscopic surgery lobectomies performed at our thoracic surgery center. METHODS: A total of 76 patients (54 males, 22 females; mean age 48.3 years; range 9 to 83 years) who underwent video-assisted thoracoscopic surgery lobectomy between January 2012 and June 2016 were retrospectively reviewed. Preoperative patient characteristics such as additional diseases or tuberculosis history, stage for malignant diseases, surgical characteristics such as port properties and amount of bleeding, postoperative characteristics such as amount, time and duration of drainage, air leakage, and discharge time, morbidity and mortality rates, and their causes were evaluated. RESULTS: Of the patients, 35 were evaluated due to benign pulmonary diseases and 41 due to malignant pulmonary diseases. Postoperative prolonged air leakage developed in 14 patients. Of these patients, one was administered thoracotomy and primary repair, three were administered pleurodesis, and three were administered secondary pleurocan catheter, while the air leakage ended spontaneously in seven patients. Due to bleeding, one patient was treated with revision video-assisted thoracoscopic surgery on the same day postoperatively. One patient developed chylothorax and one patient developed pneumonia, which caused respiratory failure. CONCLUSION: Video-assisted thoracoscopic surgery lobectomy is a safe thoracic procedure, which is used for both oncologic and non-oncologic diseases of the lung. Video-assisted thoracoscopic surgery may be performed by all thoracic surgeons experienced in open thoracic surgery. Thanks to the gained experiences, the rates of video-assisted thoracoscopic surgery lobectomy may improve in all centers.

Mediastinal epithelioid angiosarcoma arising in schwannoma: The first case in the literature.

Angiosarcoma arising in a long-standing schwannoma is extremely rare and only a few cases were reported in the English literature. Besides tumors arising from vagus, sciatic or adrenal nerves, tumors growing on neck, foot or kidney were also described. To the best of our knowledge, in this article, we report the first mediastinal case occurring in longstanding schwannoma in a 53-year-old female patient. The patient was admitted to our clinic with severe dyspnea and palpitation. Her medical history showed a progressive right-sided paramediastinal mass which was first diagnosed in 2002. Three transthoracic needle biopsies performed in 2002, 2015 and 2016 were all non-diagnostic. An operation was suggested since 2002, but the patient has not accepted. Thorax computed tomography and magnetic resonance imaging revealed a huge mediastinal mass nearly fulfilling the right hemithorax. A diagnosis of "malign spindle cell tumor" was established with the last transthoracic biopsy and total surgical resection via posterolateral throcatomy was performed. Microscopically, tumor was composed of two components: a benign schwannoma and an epithelioid angiosarcoma. Endothelial and neural cell differentiations were confirmed immunohistochemically.

Surgical management of large-cell neuroendocrinelung carcinoma: an analysis of 25 cases.

BACKGROUND/AIM: Large-cell neuroendocrine carcinoma (LCNEC) of the lung is a relatively uncommon and aggressive subset of pulmonary neuroendocrine tumors, which include typical and atypical carcinoid, and small-cell lung cancer. LCNEC of the lung accounts for no more than 1% of all lung cancers. LCNECs show features of high-grade neuroendocrine tumors and patients with LCNEC have a very poor prognosis. MATERIALS AND METHODS: Twenty-five patients (22 males and 3 females; mean years 60.7; range 48 to 77 years) who underwent pulmonary resection for large-cell neuroendocrine carcinoma between January 2004 and December 2014 were investigated retrospectively. RESULTS: Type of surgery, pathologic TNM stage, adjuvant chemotherapy, time of recurrence, site of recurrence, response to treatment, and long-term results were evaluated. The longest patient follow-up period was 83 months. One-, two-, and three-year survival rates of these patients were, respectively, 80.95%, 76.47%, and 50%. CONCLUSION: Complete surgical resection is the treatment of choice for early-stage LCNEC and chemotherapy after radical surgical treatment improves survival. Follow-up periods after surgery adjuvant chemotherapy will prevent recurrence and patients may survive for many years if complete surgical resection and adjuvant chemotherapy are possible.

Schwannoma arising in a bronchogenic cyst wall.

Bronchogenic cysts are congenital malformations thought to originate from the primitive ventral foregut, and they are the most common type of mediastinal cystic lesion. The clinical presentation of a bronchogenic cyst is variable, from respiratory distress at birth to late appearance of symptoms. Most bronchogenic cysts originate in the mediastinum, and 15% to 20% occur in the lung parenchyma. Various malignant transformations have been reported in the literature. In this report, we describe a case of schwannoma in an intrapulmonary bronchogenic cyst wall in a 38-year-old man, which was found incidentally during a routine examination.

Video-assisted thoracic surgery for pulmonary sequestration.

Bronchopulmonary sequestration is a rare developmental abnormality. Most cases are asymptomatic and found incidentally. The definitive treatment for bronchopulmonary sequestration is surgical excision. An 18-year-old man was admitted to our clinic with longstanding cough, fever, and dense sputum. Chest computed tomography identified cystic bronchiectasis in common areas of the left lower lobe, and parenchymal destruction with air-fluid levels. A left lower lobectomy was performed via a video-thoracoscopic approach.

Diagnosis and Management of Parathyroid Cysts: Description with Two Cases.

Parathyroid cysts are unilocular, thin-walled cysts, and they are seen very rarely. Their formation mechanisms are not clear. They are usually localized in the cervical region, and mediastinal settlements are rare. They are usually asymptomatic, but cysts that have settled in the neck may be symptomatic, such as tracheal pressure symptoms. There are two types-namely, functional cysts and non-functional cysts-depending on their hormonal characteristics. There are still difficulties in the diagnosis, and they can be mistaken by thyroid pathology. Treatment is surgery. We discussed two cases of parathyroid cysts that we surgically excised.

Prognostic factors in malignant pleural mesothelioma: a retrospective study of 60 Turkish patients.

AIM: Malignant pleural mesothelioma (MPM) is an aggressive tumor with poor prognosis. The study aims to examine the effect of certain clinical, laboratory, radiologic, and pathologic characteristics on survival. PATIENTS AND METHODS: Sixty patients who had undergone PET/CT evaluation at initial diagnosis were included. We investigated the effect of certain clinical, laboratory, radiologic characteristics, SUVmax of the tumor, and pathological characteristics such as histological subtype, mitotic activity index (MAI), tumor necrosis, and inflammation on survival. The pathological slides of each patient were re-evaluated for MAI, presence of necrosis, and inflammation. The patients were grouped based on number of mitosis as MAI 1:≤ 9, MAI 2:10-19, MAI 3: >19 mitosis. RESULTS: There were 34 male and 26 female patients with a mean age of 53.6 ± 10.6 years. Mean and median survival time was 14.83 ± 10.75 and 11.95 (min 0.43-max 48.10) months, respectively. Using univariate analysis leukocytosis (P = 0.009), rind-like pleural thickening (P = 0.037), advanced disease stage (P = 0.004), best supportive therapy alone (P = 0.004), SUVmax higher than 8 (P = 0.023), MAI higher than 1 (P = 0.033), and presence of tumor necrosis (P = 0.037) were found as poor prognostic factors. At multivariate analysis, leukocytosis (P = 0.026, HR: 2.27), advanced disease stage (P = 0.021, HR: 2.46), best supportive therapy alone (P = 0.029, HR: 5.12), and MAI higher than 1 (P = 0.01, HR: 3.01) were independently associated with survival, whereas SUVmax of the tumor failed to enter the model (P = 0.07, HR: 1.89). CONCLUSION: Presence of leukocytosis, advanced disease stages, supportive therapy alone, and higher MAI were found to be negative prognostic factors in patients with MPM.