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Radiation Oncology

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https://www.readbyqxmd.com/read/28327203/an-appraisal-of-analytical-tools-used-in-predicting-clinical-outcomes-following-radiation-therapy-treatment-of-men-with-prostate-cancer-a-systematic-review
#1
Elspeth Raymond, Michael E O'Callaghan, Jared Campbell, Andrew D Vincent, Kerri Beckmann, David Roder, Sue Evans, John McNeil, Jeremy Millar, John Zalcberg, Martin Borg, Kim Moretti
BACKGROUND: Prostate cancer can be treated with several different modalities, including radiation treatment. Various prognostic tools have been developed to aid decision making by providing estimates of the probability of different outcomes. Such tools have been demonstrated to have better prognostic accuracy than clinical judgment alone. METHODS: A systematic review was undertaken to identify papers relating to the prediction of clinical outcomes (biochemical failure, metastasis, survival) in patients with prostate cancer who received radiation treatment, with the particular aim of identifying whether published tools are adequately developed, validated, and provide accurate predictions...
March 21, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28320471/influence-of-autophagy-on-the-efficacy-of-radiotherapy
#2
REVIEW
Shing Yau Tam, Vincent Wing Cheung Wu, Helen Ka Wai Law
Autophagy is an important catabolic process in which cells digest and recycle their own cytoplasmic contents for maintaining cellular homeostasis. Interestingly, autophagy could play both pro-death and pro-survival roles in influencing the development of cancer via various signal pathways. As radiotherapy is one of the main treatment modalities for cancer, we reviewed the effect of autophagy modulations on radiosensitivity and radiotherapy efficacy in various cancer types. The future development of autophagy modifications for improving radiotherapy efficacy and cancer prognosis will also be discussed...
March 21, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28320428/a-topology-based-method-to-mitigate-the-dosimetric-uncertainty-caused-by-the-positional-variation-of-the-boost-volume-in-breast-conservative-radiotherapy
#3
Peng-Yi Lee, Chih-Yuan Lin, Shang-Wen Chen, Chun-Ru Chien, Chun-Nan Chu, Hsiu-Ting Hsu, Ji-An Liang, Ying-Jun Lin, An-Cheng Shiau
BACKGROUND: To improve local control rate in patients with breast cancer receiving adjuvant radiotherapy after breast conservative surgery, additional boost dose to the tumor bed could be delivered simultaneously via the simultaneous integrated boost (SIB) modulated technique. However, the position of tumor bed kept changing during the treatment course as the treatment position was aligned to bony anatomy. This study aimed to analyze the positional uncertainties between bony anatomy and tumor bed, and a topology-based approach was derived to stratify patients with high variation in tumor bed localization...
March 20, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28302144/a-dosimetric-model-for-the-heterogeneous-delivery-of-radioactive-nanoparticles-in-vivo-a-feasibility-study
#4
Andrew B Satterlee, Peter Attayek, Bentley Midkiff, Leaf Huang
ᅟ: Accurate and quantitative dosimetry for internal radiation therapy can be especially challenging, given the heterogeneity of patient anatomy, tumor anatomy, and source deposition. Internal radiotherapy sources such as nanoparticles and monoclonal antibodies require high resolution imaging to accurately model the heterogeneous distribution of these sources in the tumor. The resolution of nuclear imaging modalities is not high enough to measure the heterogeneity of intratumoral nanoparticle deposition or intratumoral regions, and mathematical models do not represent the actual heterogeneous dose or dose response...
March 17, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28288673/using-field-size-factors-to-characterize-the-in-air-fluence-of-a-proton-machine-with-a-range-shifter
#5
Jiajian Shen, Jarrod M Lentz, Yanle Hu, Wei Liu, Danairis Hernandez Morales, Joshua B Stoker, Martin Bues
INTRODUCTION: The range shifter (RS) is used to treat shallow tumors for a proton pencil beam scanning system (PBS). Adding RS certainly complicates the commissioning of the treatment planning system (TPS) because the spot sizes are significantly enlarged with RS. In this work, we present an efficient method to configure a commercial TPS for a PBS system with a fixed RS. METHODS: By combining a spiral delivery with customized control points, we were able to significantly improve measurement efficiency and obtain 250 field size factors (FSF) within three hours...
March 14, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28288658/prostate-cancer-treated-with-brachytherapy-an-exploratory-study-of-dose-dependent-biomarkers-and-quality-of-life
#6
Sarah O S Osman, Simon Horn, Darren Brady, Stephen J McMahon, Ahamed B Mohamed Yoosuf, Darren Mitchell, Karen Crowther, Ciara A Lyons, Alan R Hounsell, Kevin M Prise, Conor K McGarry, Suneil Jain, Joe M O'Sullivan
BACKGROUND: Low-dose-rate permanent prostate brachytherapy (PPB) is an attractive treatment option for patients with localised prostate cancer with excellent outcomes. As standard CT-based post-implant dosimetry often correlates poorly with late treatment-related toxicity, this exploratory (proof of concept) study was conducted to investigate correlations between radiation - induced DNA damage biomarker levels, and acute and late bowel, urinary, and sexual toxicity. METHODS: Twelve patients treated with (125)I PPB monotherapy (145Gy) for prostate cancer were included in this prospective study...
March 14, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28283034/hypo-or-conventionally-fractionated-radiotherapy-combined-with-chemotherapy-in-patients-with-limited-stage-small-cell-lung-cancer
#7
Jing Zhang, Min Fan, Di Liu, Kuai-Le Zhao, Kai-Liang Wu, Wei-Xin Zhao, Zheng-Fei Zhu, Xiao-Long Fu
BACKGROUND: Previous data from our institution showed that hypofractionated thoracic radiotherapy (HypoTRT) with concurrent etoposide/platinum chemotherapy yielded favorable survival in patients with limited-stage small cell lung cancer (LS-SCLC). The present study retrospectively compared the survival outcomes, failure patterns and toxicities between groups of LS-SCLC patients treated with conventionally fractionated thoracic radiotherapy (ConvTRT) or HypoTRT combined with chemotherapy...
March 11, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28279179/the-effect-of-bowel-preparation-regime-on-interfraction-rectal-filling-variation-during-image-guided-radiotherapy-for-prostate-cancer
#8
Ali Hosni, Tara Rosewall, Timothy Craig, Vickie Kong, Andrew Bayley, Alejandro Berlin, Robert Bristow, Charles Catton, Padraig Warde, Peter Chung
BACKGROUND: This study aimed to investigate the tolerability and impact of milk of magnesia (MoM) on interfraction rectal filling during prostate cancer radiotherapy. METHODS: Two groups were retrospectively identified, each consisting of 40 patients with prostate cancer treated with radiotherapy to prostate+/-seminal vesicles, with daily image-guidance in 78Gy/39fractions/8 weeks. The first-group followed anti-flatulence diet with MoM started 3-days prior to planning-CT and continued during radiotherapy, while the second-group followed the same anti-flatulence diet only...
March 9, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28274241/salvage-prostate-re-irradiation-using-high-dose-rate-brachytherapy-or-focal-stereotactic-body-radiotherapy-for-local-recurrence-after-definitive-radiation-therapy
#9
Aurélie Mbeutcha, Laurent Chauveinc, Pierre-Yves Bondiau, Marie-Eve Chand, Matthieu Durand, Daniel Chevallier, Jean Amiel, Daniel Lam Cham Kee, Jean-Michel Hannoun-Lévi
BACKGROUND: Optimal management of locally recurrent prostate cancer after definitive radiation therapy is still challenging. With the development of highly accurate radiotherapy devices, prostate salvage re-irradiation might generate lower toxicity rates than classical salvage therapies. We retrospectively evaluated the toxicity and the feasibility of a prostate re-irradiation after definitive radiation therapy failure. Two modalities were investigated: high-dose-rate brachytherapy (HDRB) on whole prostate gland and focal stereotactic radiotherapy (SBRT) using CyberKnife® linac...
March 9, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28270172/neoadjuvant-folfox-chemotherapy-combined-with-radiotherapy-followed-by-radical-resection-in-patients-with-locally-advanced-colon-cancer
#10
Chun-Ming Huang, Ming-Yii Huang, Cheng-Jen Ma, Yung -Sung Yeh, Hsiang-Lin Tsai, Ching-Wen Huang, Chih-Jen Huang, Jaw-Yuan Wang
BACKGROUND: Patients with locally advanced colon cancer (LACC) have a relatively poor prognosis despite radical resection and adjuvant chemotherapy. This study investigated the treatment efficacy and toxicity of neoadjuvant chemoradiotherapy in patients with LACC. METHODS: We retrospectively reviewed 36 patients with LACC preoperatively treated with chemotherapy and radiotherapy. Patients were administered chemoradiotherapy, which comprised radiotherapy and neoadjuvant chemotherapy involving a 5-fluorouracil, leucovorin, and oxaliplatin regimen every 2 weeks...
March 7, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28270162/a-phase-ii-study-of-concurrent-chemoradiotherapy-combined-with-a-weekly-paclitaxel-and-5-fluorouracil-regimen-to-treat-patients-with-advanced-oesophageal-carcinoma
#11
Yi Xia, Yun-Hai Li, Yun Chen, Jun-Hua Zhang, Qi Liu, Jia-Ying Deng, Ta-Shan Ai, Han-Ting Zhu, Jian-Hong Fan, Harun Badakhshi, Kuai-le Zhao
BACKGROUND: A phase II study was performed to investigate the safety and efficacy of weekly doses of combined paclitaxel and 5-fluorouracil (5-FU) with concurrent radiation therapy, followed by 2 cycles of consolidation chemotherapy to treat patients with advanced oesophageal carcinoma. METHODS: The eligibility criteria included local, advanced, newly diagnosed and postoperative local regional lymph node metastasis; an Eastern Cooperative Oncology Group (ECOG) score of ≤ 2; and adequate organ function...
March 7, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28253929/reducing-radiation-dose-to-normal-brain-through-a-risk-adapted-dose-reduction-protocol-for-patients-with-favourable-subtype-anaplastic-glioma
#12
M Back, M LeMottee, C Crasta, D Bailey, H Wheeler, L Guo, T Eade
AIM: In patients with isocitrate dehydrogenase (IDH) mutated anaplastic glioma determine the dosimetric benefits of delivering radiation therapy using a PET guided integrated boost IMRT technique (ib-IMRT) compared with standard IMRT (s-IMRT) in reducing dose to normal brain. METHODS: Ten patients with anaplastic glioma, identified as a favourable molecular subgroup through presence of IDH mutation, and managed with radiation therapy using an ib-IMRT were enrolled into a dosimetric study comparing two RT techniques: s-IMRT to 59...
March 2, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28249612/do-selective-radiation-dose-escalation-and-tumour-hypoxia-status-impact-the-loco-regional-tumour-control-after-radio-chemotherapy-of-head-neck-tumours-the-escalox-protocol
#13
Steffi U Pigorsch, Jan J Wilkens, Severin Kampfer, Victoria Kehl, Alexander Hapfelmeier, Christian Schläger, Henning Bier, Markus Schwaiger, Stephanie E Combs
BACKGROUND: Standard of care primary treatment of carcinoma of locally advanced squamous cell head and neck cancer (LAHNSCC) consists of platinum-based concomitant chemo-irradiation. Despite progress in the treatment of LAHNSCC using modern radiotherapy techniques the outcome remains still poor. Using IMRT with SIB the escalation of total dose to the GTV is possible with the aim to improve clinical outcome. This study tests the hypothesis if radiation dose escalation to the GTV improves 2-year-LRC and -OS after concomitant chemo-irradiation...
March 1, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28249609/analysis-of-inter-and-intra-fractional-partial-bladder-wall-movement-using-implanted-fiducial-markers
#14
REVIEW
Kentaro Nishioka, Shinichi Shimizu, Nobuo Shinohara, Yoichi M Ito, Takashige Abe, Satoru Maruyama, Norio Katoh, Rumiko Kinoshita, Takayuki Hashimoto, Naoki Miyamoto, Rikiya Onimaru, Hiroki Shirato
BACKGROUND: Current adaptive and dose escalating radiotherapy for muscle invasive bladder cancer requires knowledge of both inter-fractional and intra-fractional motion of the bladder wall involved. The purpose of this study is to characterize inter- and intra-fractional movement of the partial bladder wall using implanted fiducial markers and a real-time tumor-tracking radiotherapy system. METHODS: Two hundred fifty one sessions with 29 patients were analysed. After maximal transurethral bladder tumor resection and 40 Gy of whole bladder irradiation, up to six gold markers were implanted transurethrally into the bladder wall around the tumor bed and used for positional registration...
March 1, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28245881/clinical-outcomes-of-gastrointestinal-brain-metastases-treated-with-radiotherapy
#15
Samrat M Sanghvi, Jonathan W Lischalk, Ling Cai, Sean Collins, Mani Nair, Brain Collins, Keith Unger
BACKGROUND: Brain metastases of gastrointestinal origin are a rare occurrence. Radiation therapy (RT) in the form of stereotactic radiosurgery (SRS) or whole brain radiation therapy (WBRT) is an effective established treatment modality in either the definitive or adjuvant setting. The aim of this study is to assess the long-term clinical outcomes of patients with gastrointestinal (GI) brain metastases treated with SRS or WBRT. METHODS: In this single institutional retrospective review, we detail the outcomes of patients diagnosed with metastatic brain tumors from an adenocarcinoma gastrointestinal primary...
February 28, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28245874/timing-of-thoracic-radiotherapy-in-the-treatment-of-extensive-stage-small-cell-lung-cancer-important-or-not
#16
Jing Luo, Liming Xu, Lujun Zhao, Yuanjie Cao, Qingsong Pang, Jun Wang, Zhiyong Yuan, Ping Wang
BACKGROUND: This study evaluated the prognosis of patients with extensive-stage small-cell lung cancer (ES-SCLC) that may be associated with timing of thoracic radiotherapy (TRT). METHODS: ES-SCLC patients (n = 232) without progression were retrospectively analyzed after first-line induction chemotherapy. Patients in the TRT group were stratified as early-TRT (ERT; ≤3 cycles of induction chemotherapy received prior to TRT, n = 65) or late-TRT (LRT; >3 cycles, n = 122)...
February 28, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28241841/real-time-in-vivo-rectal-wall-dosimetry-using-moskin-detectors-during-linac-based-stereotactic-radiotherapy-with-rectal-displacement
#17
Kimberley Legge, Peter B Greer, Daryl J O'Connor, Lee Wilton, Matthew Richardson, Perry Hunter, Alex Wilfert, Jarad Martin, Anatoly Rosenfeld, Dean Cutajar
BACKGROUND: MOSFET dosimetry is a method that has been used to measure in-vivo doses during brachytherapy treatments and during linac based radiotherapy treatment. Rectal displacement devices (RDDs) allow for safe dose escalation for prostate cancer treatment. This study used dual MOSkin detectors to assess real-time in vivo rectal wall dose in patients with an RDD in place during a high dose prostate stereotactic body radiation therapy (SBRT) boost trial. METHODS: The PROMETHEUS study commenced in 2014 and provides a prostate SBRT boost dose with a RDD in place...
February 27, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28228150/a-comparative-study-of-dose-distribution-of-pbt-3d-crt-and-imrt-for-pediatric-brain-tumors
#18
Daichi Takizawa, Masashi Mizumoto, Tetsuya Yamamoto, Yoshiko Oshiro, Hiroko Fukushima, Takashi Fukushima, Toshiyuki Terunuma, Toshiyuki Okumura, Koji Tsuboi, Hideyuki Sakurai
INTRODUCTION: It was reported that proton beam therapy (PBT) reduced the normal brain dose compared with X-ray therapy for pediatric brain tumors. We considered whether there was not the condition that PBT was more disadvantageous than intensity modulated photon radiotherapy (IMRT) and 3D conventional radiotherapy (3D-CRT) for treatment of pediatric brain tumors about the dose reduction for the normal brain when the tumor location or tumor size were different. METHODS: The subjects were 12 patients treated with PBT at our institute, including 6 cases of ependymoma treated by local irradiation and 6 cases of germinoma treated by irradiation of all four cerebral ventricles...
February 22, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28219406/definitive-salvage-radiation-therapy-and-chemoradiation-therapy-for-lymph-node-oligo-recurrence-of-esophageal-cancer-a-japanese-multi-institutional-study-of-237-patients
#19
Hideomi Yamashita, Keiichi Jingu, Yuzuru Niibe, Kuniaki Katsui, Toshihiko Matsumoto, Tomohiro Nishina, Atsuro Terahara
BACKGROUND: This study evaluated the treatment results of lymph node (LN) oligo-recurrence in esophageal cancer patients treated with salvage radiotherapy (RT) in a multi-institutional retrospective study. METHODS: Eligibility criteria for this retrospective analysis were: the primary lesion of esophageal cancer was controlled; from one to five LN recurrences; total RT dose ≥45 Gy to exclude palliative RT; without recurrence other than LN; and salvage RT for LN recurrence was given between January 2000 and April 2015...
February 20, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28219396/concurrent-chemoradiotherapy-with-conventional-fractionated-radiotherapy-and-low-dose-daily-cisplatin-plus-weekly-docetaxel-for-t2n0-glottic-cancer
#20
Jun-Ichi Saitoh, Katsuyuki Shirai, Masumi Imaeda, Atsushi Musha, Takanori Abe, Masato Shino, Yukihiro Takayasu, Katsumasa Takahashi, Kazuaki Chikamatsu, Takashi Nakano
BACKGROUND: To assess the efficacy of concurrent chemoradiotherapy (CCRT) with daily low-dose cisplatin (CDDP) plus weekly docetaxel (DTX) for patients with T2N0 glottic cancer. METHODS: Between January 2004 and December 2013, 62 treatment-naive patients with histologically proven T2N0 glottic cancer were treated with concurrent chemoradiotherapy. Radiation therapy (RT; 2 Gy daily fractions up to a total dose of 66 Gy) was administered in combination with daily low-dose CDDP (6 mg/m(2), five times a week), plus weekly DTX (10 mg/m(2)) for up to 4 weeks from the commencement of RT...
February 20, 2017: Radiation Oncology
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