Publications by authors named "Amitesh C Roy"

Purpose: SHR-A1811 is an antibody-drug conjugate composed of an anti-human epidermal growth factor receptor 2 (HER2) antibody trastuzumab, a cleavable linker, and a topoisomerase I inhibitor payload. We assessed the safety, tolerability, antitumor activity, and pharmacokinetics of SHR-A1811 in heavily pretreated HER2-expressing or mutated advanced solid tumors.

Methods: This global, multi-center, first-in-human, phase I trial was conducted at 33 centers.

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Background: Colorectal cancer with synchronous liver-only metastasis is managed with a multimodal approach, however, optimal sequencing of modalities remains unclear.

Methods: A retrospective review of all consecutive rectal or colon cancer cases with synchronous liver-only metastasis was conducted from the South Australian Colorectal Cancer Registry from 2006 to 2021. This study aimed to investigate how order and type of treatment modality affects overall survival.

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Objectives: Nab-paclitaxel has radiosensitizing antitumor efficacy in pancreatic cancer. We aimed to establish maximum tolerated dose (MTD) of nab-paclitaxel with radiotherapy in unresectable locally advanced pancreatic cancer.

Methods: In a phase I dose escalation trial patients received weekly nab-paclitaxel for 6 weeks with external beam radiotherapy (EBRT).

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Background: The risk of recurrence after completion of curative-intent treatment of colorectal cancer (CRC) is hard to predict. Post-treatment assaying for circulating tumor DNA (ctDNA) is an encouraging approach for stratifying patients for therapy, but the prognostic value of this approach is less explored. This study aimed to determine if detection of methylated BCAT1 and IKZF1 following completion of initial treatment identified patients with a poorer recurrence-free survival (RFS).

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Article Synopsis
  • Gastrointestinal stromal tumours (GISTs) are the most common type of mesenchymal tumours in the gastrointestinal tract, and the advent of tyrosine kinase inhibitors (TKIs) has significantly improved treatment options for advanced cases.
  • Imatinib was the first TKI approved for advanced GIST, setting a new standard of care, and now there are five approved targeted therapies available, including sunitinib and regorafenib, following key clinical trials like GRID and INVICTUS.
  • The Australasian Gastrointestinal Trials Group (AGITG) highlights the importance of molecular testing to guide therapy based on specific molecular targets, as well as future directions for treating advanced GISTs.
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Background: Effective targeting of RAS mutations has proven elusive until recently. Novel agents directly targeting KRAS G12C have shown promise in early-phase clinical trials that included patients with metastatic colorectal cancer. Prior reports have suggested that G12C mutation may be predictive of poor outcome.

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Aims: Gastric cancer with peritoneal involvement has a poor prognosis. Intraperitoneal (IP) paclitaxel has shown promising results in these patients. However, this approach has only been studied in the Asian population, and in combination with S-1.

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Introduction: Pancreatic cancer remains a challenging malignancy due to the high proportion of patients diagnosed at advanced stages and the limited treatment options. This article discusses recent evidence in the management of both localized and advanced pancreatic cancer and offers an expert opinion on current best practice.

Areas Covered: For patients with localized disease, the evidence for adjuvant chemotherapy is discussed as well as emerging neoadjuvant approaches for resectable, borderline resectable, and locally advanced disease.

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Background: Nivolumab improves disease control and survival in advanced NSCLC in patients with good performance status (PS), but there is limited data on its efficacy in patients with poor PS.

Aim: Primary objective of the study was to evaluate the efficacy and safety of nivolumab and examine the influence of PS on outcomes.

Methods And Results: Retrospective analysis of patients treated with single-agent nivolumab for advanced NSCLC at a single institution was performed.

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: A multimodal approach in operable early-stage oesophago-gastric (OG) cancer has evolved in the last decade, leading to improvement in overall outcomes.: A review of the published literature and conference abstracts was undertaken on the topic of optimal adjunctive chemotherapy or chemoradiotherapy in early-stage OG cancers. This review article focuses on the current evidence pertaining to neoadjuvant and perioperative strategies in curable OG cancers including the evolving landscape of immunotherapy and targeted drugs in this setting.

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Article Synopsis
  • Studies show differences in characteristics and outcomes for metastatic colorectal cancer (mCRC) patients based on whether they were treated in public or private hospitals in South Australia.
  • A comprehensive study analyzed data from 3,470 mCRC patients, revealing that public hospital patients tend to have a higher burden of disease and receive less treatment compared to those in private hospitals.
  • Results indicated that after adjustments, public patients had a shorter survival time by 1.33 months than private patients, highlighting disparities in care and outcomes.
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Introduction: Gastric cancer with peritoneal metastasis has a poor outcome. Only a few studies have specifically investigated this group of patients. Japanese researchers have shown that chemotherapy with intraperitoneal paclitaxel (IPP) and oral S-1 (tegafur/gimeracil/oteracil) is active and well tolerated.

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Uncommon neoplasms of the anal canal are associated with significant diagnostic dilemma in clinical practice and a high index of suspicion and pathologic expertise is needed. The incidence is likely to increase, particularly of small, incidental lesions found because of use of more frequent colonoscopy and high-definition MRI. Generally treatment follows that of the same histologic subtype in other anatomic location.

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Exercise and a healthy diet are beneficial after cancer, but are not uniformly adopted by cancer survivors. This study reports on the feasibility, acceptability, and effectiveness of a self-management-based nutrition and exercise intervention for Australian cancer survivors. Adult survivors (n  =  25) during curative chemotherapy (stratum 1[S1]; n  =  11) or post-treatment (stratum 2 [S2]; n  =  14) were recruited prospectively from a single center.

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Background Randomized controlled trials evaluating biological therapy have shown improvements in survival from metastatic colorectal cancer (mCRC). Subjects in the trials represent a selected proportion of mCRC patients. We have the potential to assess the impact of biological therapy on mCRC outcomes, particularly the effect of bevacizumab, from a population-based clinical registry by comparing two time cohorts with differences in therapy accessibility.

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Background: Colorectal cancer (CRC) is a common malignancy. There is growing evidence that CRC incidence is increasing in the younger population. There is controversy surrounding the prognosis of young patients with CRC.

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Objective: This study aims to investigate disparities in demographics, disease characteristics, treatment and overall survival between South Australian (SA) Indigenous and non-Indigenous patients with metastatic colorectal cancer (mCRC).

Design: This employs a retrospective population study using the SA mCRC registry.

Setting: The SA mCRC registry identifies mCRC patients from hospital encounters, histopathology reports, medical oncology letters, clinician notification, attendances at multidisciplinary meetings and death audits by the SA Cancer Registry.

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Aim: Carboplatin dosing depends on accurate glomerular filtration rate (GFR) estimation. There is a lack of clinical agreement about carboplatin dosing when the GFR measurement is very high (>110 mL/min).

Methods: A retrospective audit of pre-chemotherapy 99m technetium (Tc) diethylenetriamene pentaacetate (DTPA) radionuclide GFR estimations and patients' chart review were performed from January 2006 to May 2009.

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