Publications by authors named "Ostwal Vikas"

Purpose: Biliary tract cancers (BTCs) are usually diagnosed in advanced stages, where treatment options are either palliative chemotherapy and/or best supportive care. The breakthrough results of the TOPAZ-1 trial demonstrated a 24% decrease in risk of death at 2 years with the addition of durvalumab to chemotherapy.

Materials And Methods: This was a multicenter retrospective cohort study conducted across 14 institutions in India.

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Background: Immune check point inhibitors (ICIs) have an established role in Microsatellite-Instability-High (MSI-H) and Combined Positive Score (CPS) high advanced gastric/gastroesophageal (G/GE) adenocarcinomas, but there is limited real world data with regard to practice patterns, and efficacy of standard doses (SD-ICIs) and alternative lower doses (LD-ICIs).

Methods: A retrospective study of patients with advanced G/GE adenocarcinomas receiving ICIs was conducted. The primary endpoint of the study was 12-month overall survival (OS), which was computed by Kaplan-Meier method.

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Article Synopsis
  • Extra-ampullary duodenal adenocarcinoma is a rare cancer, and this study examined the long-term outcomes and survival factors in patients who underwent surgery for it.
  • The analysis included 59 patients, primarily males aged around 60, with most tumors located in the second part of the duodenum, and followed them for a median of 32 months post-surgery.
  • Key findings revealed that factors like having clear surgical margins, the type of adenocarcinoma, and the lymph node ratio significantly impacted overall survival rates, while the effectiveness of adjuvant chemotherapy is still uncertain.
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Purpose: Standard-dose immune checkpoint inhibitors (SD-ICIs) are the standard of care as initial therapy in microsatellite instable-high (MSI-H) advanced/metastatic colorectal adenocarcinomas (mCRC), but there are preclinical data to suggest that low-dose ICIs (LD-ICI) might also have similar efficacy.

Materials And Methods: A retrospective study of patients with MSI-H mCRC receiving ICIs between June 2017 and January 2023 was conducted. The primary end point of the study was 12-month progression-free survival (PFS), which was computed using the Kaplan-Meier method.

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Importance: The role of olanzapine has not been adequately evaluated in moderately emetogenic chemotherapy (MEC) regimens with or without neurokinin-1 receptor antagonists.

Objective: To evaluate whether addition of olanzapine to an MEC regimen reduces nausea, vomiting, and use of nausea rescue medications among patients with solid malignant tumors.

Design, Setting, And Participants: This multicenter, open-label phase 3 randomized clinical trial included patients aged 18 years or older with solid malignant tumors who were receiving oxaliplatin-, carboplatin-, or irinotecan-based chemotherapy.

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Background: 'Textbook Outcome' (TO) represents an effort to define a standardized, composite quality benchmark based on intraoperative and postoperative endpoints. This study aimed to assess the applicability of TO as an outcome measure following liver resection for hepatic neoplasms from a low- to middle-income economy and determine its impact on long-term survival. Based on identified perioperative predictors, we developed and validated a nomogram-based scoring and risk stratification system.

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Article Synopsis
  • This study evaluated the effectiveness of a combination therapy of bevacizumab and erlotinib compared to active surveillance in patients with advanced biliary tract cancers who had stable disease after 6 months of gemcitabine-based chemotherapy.
  • The study randomly assigned 98 patients to either treatment arm and found that those receiving the combination therapy had a median progression-free survival of 5.3 months versus 3.1 months for the surveillance group.
  • The side effects were generally manageable, suggesting that the combination therapy is a viable option for improving patient outcomes in this context.*
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Background: The evolution and outcomes of extended pancreatectomies at a single institute over 15 years are presented in this study.

Methods: A retrospective analysis of the institutional database was performed from 2015 to 2022 (period B). Patients undergoing extended pancreatic resections, as defined by the International Study Group for Pancreatic Surgery, were included.

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  • The study aimed to assess if adding docetaxel (D) to standard chemotherapy regimens improved overall survival (OS) in patients with advanced HER2-negative gastroesophageal junction and gastric adenocarcinomas.
  • Out of 324 patients enrolled, the analysis showed that FOLFOX/CAPOX provided a median OS of 10.1 months, while the DOF/DOX regimen resulted in 8.9 months, with no significant survival advantage from the addition of docetaxel (P = .70).
  • The study also noted higher rates of severe neutropenia and neuropathy in the DOF/DOX group and identified a surprisingly high incidence of BRCA1 and BRCA2 alterations
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Background: Surgery remains debatable in para-aortic lymph node (PALN, station 16b1) metastasis in non-pancreatic periampullary cancer (NPPAC). This study examined the impact of PALN metastasis on outcomes following pancreaticoduodenectomy (PD) in NPPAC.

Methods: A retrospective analysis of patients with NPPAC who were explored for PD with PALN dissection was performed.

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Background: The role of adjuvant therapy in resected periampullary adenocarcinomas is equivocal due to contrasting data and limited prospective trials.

Methods: The Multicentre Indian Pancreatic & Periampullary Adenocarcinoma Project (MIPPAP), included data from 8 institutions across India. Of the 1679 pancreatic resections, 736 patients with T3/T4 and/or Node positive adenocarcinomas (considered as high risk for recurrence) were included for analysis.

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Background: Outside of clinical trials, real-world data of advanced gastric cancers (AGCs) managed with perioperative or adjuvant chemotherapy with a backbone of D2 lymphadenectomy is limited.

Patients And Methods: Curative resections for gastric adenocarcinoma between January 2003 and January 2020 at the Tata Memorial Centre were analyzed, comparing three time periods marking major increments in annual gastric resections (GRs).

Results: 1657 radical gastric resections were performed with a morbidity and mortality rate of 34.

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Background: Intraoperative unresectability, postoperative deaths and early recurrences remain devastating futile events in the surgical management of Intrahepatic cholangiocarcinomas (iCCA) and Perihilar cholangiocarcinomas (pCCA). The present study aims to determine the preoperative predictors of futile surgery in cholangiocarcinomas.

Methods: Consecutive hepatectomies for iCCA and pCCA, between September 2010 and June 2022 were included.

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Importance: There is limited evidence with regard to the benefit of adjuvant chemotherapy chemoradiotherapy in resected gallbladder cancers (GBCs).

Objective: To establish a baseline survival rate for operated GBCs in patients receiving either gemcitabine plus cisplatin (GC) or capecitabine and capecitabine concurrent with chemoradiation (CCRT).

Design, Setting, And Participants: The GECCOR-GB study was a multicenter, open-label, randomized phase 2 noncomparator "pick the winner" design trial of adjuvant GC and CCRT in patients with resected histologically confirmed adenocarcinoma or adenosquamous carcinoma of the gallbladder, (stage II/III) with no local residual tumor (R0) or microscopic residual tumor (R1).

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Background: CA 19-9 is an extremely useful biomarker for pancreatic ductal adenocarcinomas (PDACs). However, the optimal cut-off and prognostic significance at higher cut-offs are yet to be determined.

Methods: Retrospective analysis included patients with PDAC who underwent curative resection from January 2010 to May 2020 at Tata Memorial Centre, Mumbai.

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Objective: To determine the clinical utility of serum CA 19-9 surveillance for detecting recurrences in resected ampullary carcinomas (ACs).

Introduction: Although an established prognostic marker for pancreatic ductal adenocarcinoma, the value of CA 19-9 in resected ACs during follow-up is unknown.

Methods: Retrospective analysis of ACs undergoing pancreaticoduodenectomy at Tata Memorial Centre-Mumbai, from January 2012 to January 2020 was performed.

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Article Synopsis
  • The study analyzes factors affecting progression-free survival (PFS) in patients with metastatic grade 1 gastroenteropancreatic neuroendocrine tumors (GEP-NET) from a database between January 2018 and December 2021.
  • Among 589 treated GEP-NET patients, 100 were grade 1 with metastasis, showing a median PFS of 54.5 months and a significant difference in overall survival rates based on liver disease burden.
  • The findings suggest that higher liver tumor burden correlates with poorer PFS and overall survival, indicating a need for more aggressive treatment strategies in these cases.
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Background: Gallbladder cancers (GBCs) occur a decade earlier in India in comparison to the global occurrence, limiting the applicability of existing literature on age adjusted outcomes.

Methods: Patients who underwent surgery between 01.01.

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Background: In the preplanned interim analysis of the TOPAZ-1 study, durvalumab plus gemcitabine-cisplatin significantly improved overall survival versus placebo plus gemcitabine-cisplatin in participants with advanced biliary tract cancer. We aimed to report updated overall survival and safety data from TOPAZ-1 with additional follow-up and data maturity beyond the interim analysis.

Methods: TOPAZ-1 was a phase 3, randomised, double-masked, placebo-controlled, global study done at 105 sites in 17 countries.

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Hepatic artery infusion chemotherapy (HAIC) is a popular treatment modality for the treatment of colorectal liver metastasis (CRLM). The aim of this study was to determine the feasibility of HAIC for high-risk resected CRLM delivered using repeated femoral puncture and delivering 5-fluorouracil infusional chemotherapy along with systemic adjuvant chemotherapy. The present study is a retrospective review of a prospectively maintained database.

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Purpose: Desmoid fibromatosis (DF) is a locally aggressive tumor with low mortality but significant morbidity. There is a lack of standard of care, and existing therapies are associated with significant barriers including access, cost, and toxicities. This study aimed to explore the efficacy and safety of the metronomic therapy (MT) in DF in a large, homogenous cohort from India.

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Background: Advances in perioperative chemotherapy have improved outcomes in patients with gastric cancers (GC). This strategy leads to tumour downstaging and may result in a pathologic complete response (pCR). The study aimed to evaluate the predictors of pCR and determine the impact of pCR on long-term survival.

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Purpose: To evaluate the outcomes of post-neoadjuvant chemoradiation (NACTRT) wait-and-watch Strategy (WWS) in distal rectal cancers.

Materials And Methods: All consecutive patients from December 2012 to 2019 diagnosed with distal rectal tumors (T2-T4 N0-N+) having a complete or near-complete response (cCR or nCR, respectively) post-NACTRT and wishing for the non-surgical treatment option of WWS were included in this study. Patients were observed with 3 monthly magnetic resonance imaging (MRIs), sigmoidoscopies, and digital rectal examination for 2 years and 6 monthly thereafter.

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Background: There is limited data with regard to the use of modified 5-fluoroural-leucovorin-irinotecan-oxaliplatin (mFOLFIRINOX) in terms of tolerance and enabling total mesorectal excision (TME) of locally advanced rectal adenocarcinomas (LARC) with high-risk characteristics (T4b status, signet ring histology etc) post standard neoadjuvant long course chemoradiation (NACTRT) or short course radiation (SCRT) and chemotherapy.

Materials And Methods: Patients with LARC from January 2018 to December 2020 receiving mFOLFIRINOX post NACTRT/SCRT to facilitate TME were evaluated. The primary endpoint was assessment of grade 3 and grade 4 treatment related toxicity and TME rates.

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