Publications by authors named "Ajay K Dewan"

Article Synopsis
  • Primary melanoma of the oral cavity is rare, making up only 0.2-8% of melanomas, with lesions most commonly found on the gingiva or palate; these mucosal melanomas generally have a poorer prognosis than skin melanomas.
  • A 46-year-old woman presented with a black lesion on her tongue, which upon biopsy was diagnosed as malignant melanoma; she underwent surgery, and the final report indicated lymph node metastases but clear margins.
  • Early diagnosis through thorough oral examinations and biopsies is crucial for improving prognosis in patients with oral malignant melanoma.
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: Myoepithelioma is a rare neoplasm of the salivary glands and accounts for less than 1% of salivary gland neoplasms. Only 7 cases of myoepithelioma in the nasal cavity have been reported till date in literature. : A 61 year old male presented to us with epistaxis.

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Unlabelled: Benign soft tissue chondroma is a rare type of extraskeletal chondrocytic tumour. It usually can be found in skeletal system in extremities. Head and neck region is one of the most uncommon sites for extraskeletal chondroma .

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Non skin malignant melanomas are known to be more aggressive than the skin counterpart. A 50-year lady with recurrent epistaxis, had mass in right sphenoid, which was resected by endoscopic sinus surgery. After histopathological confirmation of malignant melanoma radiotherapy was given.

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Background: Skeletal muscle is relatively uncommon site for metastasis in head and neck primary. This study was conducted to report our experience of three such cases and analyze the previously reported cases to assess the overall outcomes and formulate a treatment plan for these patients.

Methods: We pooled the data extracted on extensive literature review and analyzed.

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Adenoid cystic carcinoma of the nasopharynx is a rare, slow growing, and locally aggressive neoplasm. Three cases presented with recurrent epistaxis. Endoscopy-guided biopsy proved the diagnosis of adenoid cystic carcinoma.

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 There is a steep learning curve to attain a consistently good result in microvascular surgery. The venous anastomosis is a critical step in free-tissue transfer. The margin of error is less and the outcome depends on the surgeon's skill and technique.

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The present analysis reports the clinical, pathological, treatment profile and overall survival (OS) and disease-free survival (DFS) outcomes of consecutive breast cancer patients from three Indian centres, who underwent curative surgery as their first treatment. Among the 3453 patients, stage I, II, and III cases were 11.75%, 66.

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Background: Early oral cavity cancer has good prognosis but recurrence in them is still not uncommon. There is no general consensus on the prognostic factors and adjuvant therapy that would have a significant impact on survival.

Methods: A retrospective analysis of early oral cavity cancer patients during the time period 2009-2017.

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Introduction: Lymph node involvement and the number of positive nodes is a significant prognosticator in oral cavity cancers and current staging system does not incorporate it as an integral part.

Material And Methods: This was a retrospective study of oral cavity cancer patients who were operated during the time period of 2009-2017. The data was collected and analysed to assess the impact of increase in the number of positive nodes on survival and its comparison of survival statistics to current AJCC staging.

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Thymolipoma is a rarely seen benign pathological entity of anterior mediastinum and constitutes of around 2-7% of thymic tumors. They usually present as soft tissue mass composed of mature adipose tissue and thymic tissue, which are clinically silent most of the time, i.e.

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Aim: To study feasibility of simultaneous integrated boost by intensity modulated radiotherapy (SIB-IMRT) in patients undergoing breast conserving surgery and its impact on cosmesis and dosimetry.

Patients And Methods: Between January 2014 and June 2017, all breast cancer patients fulfilling inclusion and exclusion criteria were enrolled in a prospective study conducted at a tertiary cancer centre in North India. All patients received adjuvant radiotherapy by simultaneous integrated boost technique following breast conserving surgery.

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Background: Transcutaneous laryngeal ultrasound (TCLUS) can assess Vocal folds (VF) by subjectively identifying mobility or objectively by calculating vocal fold displacement velocity (VFDV). Optimal diagnostic approach (subjective assessment, VFDV estimation or a combination of both) is unresolved; hence, we conducted this prospective study in patients undergoing thyroidectomy.

Method: Two anaesthetists performed TCLUS pre- and post-operatively for functional assessment of 200 VFs on 100 patients.

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Background: With the introduction of new American Joint Committee on Cancer (AJCC) classifications for head and neck cancers few cases are upgraded from T2 to T3 based only on depth of invasion. The role of adjuvant therapy in this particular subset of patients is still not defined.

Methods: This is a retrospective analysis of data from 2009 to 2015, of patients with histopathology of pT1, T2, and N0.

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Incidental prostatic carcinoma on radical cystectomy histology specimens is not an uncommon entity and managing such cases is still controversial. Classification into clinically significant and insignificant cancers by Epstein based on the assumption that one is more likely to affect the survival than the other is not universally accepted. We conducted this retrospective analysis with the aim to find out the role of dichotomization of incidental prostatic cancer into such classification.

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Objective: We present our experience of gliosarcoma (GSM) in oncology tertiary care center over the last 5 years.

Materials And Methods: We carried out a retrospective analysis of seven patients with GSM diagnosed between April 2008 and December 2012. Demographic data, clinicopathological data, treatment strategies employed, details of recurrence, and survival patterns were reviewed.

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Introduction: Open radical cystectomy (ORC) has been the standard treatment for muscle-invasive bladder cancer, but this is associated with significant morbidity and mortality. Robot-assisted radical cystectomy (RARC) has been proposed as minimally invasive alternative with improved morbidity and acceptable oncological outcomes, but a large series featuring RARC and their comparison with ORC is still lacking in India despite more than a decade of its inception. We have conducted this study with an objective to see the feasibility of RARC in the Indian context and compare it with contemporary standard.

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We report results of the studies relating to fabrication of nanostructured metal oxide (NMO) based cancer biosensor. With the help of 2D electroactive reduced graphene oxide (RGO), we successfully inhibited the Brownian motion of NMO that led to reduced agglomeration of NMO. The nanostructured hafnium oxide (nHfO) was used as a model NMO.

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The correlation of interleukin 10 (IL-10) with the outbreak and progression of cancer has been well established as it contributes to tumor immune evasion. Convincing number of evidences has been accumulated to reflect the critical correlation between IL-10 polymorphism and tumorogenesis. Several polymorphic sites at promoter regions have been reported to be associated with cancer susceptibility.

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Background: The present study was conducted to evaluate the technical feasibility, safety and adequacy of surgical margins with salvage transoral robotic surgery (TORS) for recurrent or residual head and neck squamous cell carcinoma patients.

Materials And Methods: Thirty patients who underwent salvage TORS using the 'DaVinci' robot were enrolled in the study and data related to their surgical time, complications and functional outcome were recorded.

Results: The feasibility of salvage TORS in our study was observed to be 100%.

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Background: To assess the immunohistochemical expression of estrogen receptor (ER), progesterone receptor (PgR) and human epidermal growth factor receptor-2 (HER2) neu receptor in breast cancer and their associations with various clinicopathological characteristics.

Materials And Methods: This is a retrospective analysis of women who presented with primary, unilateral breast cancer in the Department of Medical Oncology at Rajiv Gandhi Cancer Institute and Research Centre, Delhi, India during the period from January 2008 to December 2011. Data were retrieved from the medical records of the hospital including both early and locally advanced cancer cases.

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Results of the studies are reported relating to application of the silanized nanostructured zirconia, electrophoretically deposited onto indium tin oxide (ITO) coated glass for covalent immobilization of the monoclonal antibodies (anti-CYFRA-21-1). This biosensing platform has been utilized for a simple, efficient, noninvasive, and label-free detection of oral cancer via cyclic voltammetry technique. The results of electrochemical response studies conducted on bovine serum albumin (BSA)/anti-CYFRA-21-1/3-aminopropyl triethoxy silane (APTES)/ZrO/ITO immunoelectrode reveal that this immunoelectrode can be used to measure CYFRA-21-1 (oral cancer biomarker) concentration in saliva samples, with a high sensitivity of 2.

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Background: The aim of this observational prospective study was to determine the technical feasibility, safety and adequacy of surgical margins for transoral robotic surgery (TORS) in oropharyngeal cancers.

Methods: From March 2013 to May 2014, 60 patients with oropharyngeal lesions underwent TORS with or without neck dissection using the 'DaVinci' robot. Patients were observed and data recorded on surgical time, blood loss, complications and functional outcome of patients.

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Purpose: The fusion imaging modality of positron-emission tomography-computed tomography (PET-CT) has emerged as an important modality in the management of recurrent head and neck tumors. The aims of this study were to assess the role of PET-CT in the detection of recurrence in treated head and neck squamous cell carcinoma (HNSCC) and compare neck PET-CT and contrast-enhanced computed tomography (CECT) in the detection of locoregional recurrence with histopathologic correlation.

Materials And Methods: The study design was prospective and the study consisted of patients with treated HNSCC referred to the Department of Radiology at Rajiv Gandhi Cancer Institute and Research Center for follow-up or for clinical suspicion of recurrence.

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Buccal mucosal cancer is commonly seen in India with patients presenting in advanced stages of the disease. Its excision commonly mandates division of parotid duct as a part of disease or its margin. We have adopted a simple method to salvage the parotid gland by cannulating the duct and rerouting the saliva into the oral cavity at a different site.

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