Seung Do Ahn

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Background The purpose of this retrospective study was to analyze the overall survival of patients with brain metastases due to breast cancer and to identify prognostic factors that affect clinical outcome. Methods Of the 7,872 breast cancer patients histologically diagnosed with breast cancer between January 1990 and July 2006 at the Asan Medical Center,(More)
The majority of ocular adnexal lymphomas (OAL) are primary marginal zone B-cell lymphomas (MALT lymphomas). The present study correlated the clinicopathological variables with the histologic subtypes by World Health Organization (WHO) classification with emphasis on MALT lymphomas in OALs of Koreans. There were 68 cases (31 males and 37 females), with a(More)
PURPOSE Capecitabine is an attractive radiosensitizer which can be tumor specific. This study was undertaken to evaluate the toxicity and efficacy of oral capecitabine when used with preoperative radiation therapy. METHODS AND MATERIALS We conducted a prospective Phase II trial to assess the pathologic response, sphincter preservation effect, and acute(More)
PURPOSE To assess the body-framed stereotactic body radiation therapy (SBRT) results and toxicity for medically inoperable stage I lung cancer adjacent to central large bronchus and then compare the results with those of SBRT in peripheral lung tumor in the aspects of survival and SBRT-related pulmonary toxicities. MATERIALS From June 1999 to May 2006, 32(More)
PURPOSE To assess the efficacy of 18Fluorodeoxyglucose-positron emission tomography (FDG-PET) for predicting a pathologic response in locally advanced esophageal cancer after neoadjuvant chemoradiotherapy. METHODS AND MATERIALS All enrolled patients were treated with neoadjuvant chemoradiotherapy followed by esophagectomy and underwent two FDG-PET scans,(More)
PURPOSE To present preliminary results of intensity-modulated radiotherapy (IMRT) with the simultaneous modulated accelerated radiotherapy (SMART) boost technique in patients with nasopharyngeal carcinoma (NPC). METHODS AND MATERIALS Twenty patients who underwent IMRT for nondisseminated NPC at the Asan Medical Center between September 2001 and December(More)
BACKGROUND To compare dosimetric parameters of volumetric modulated arc therapy (VMAT) and non-coplanar intensity modulated radiotherapy (IMRT) for nasal cavity and paranasal sinus cancer with regard to the coverage of planning target volume (PTV) and the sparing of organs at risk (OAR). METHODS Ten patients with nasal cavity or paranasal sinus cancer(More)
To evaluate the influence of different sources and treatment planning systems (TPSs), we calculated the dose distributions of 10 patients treated by HDR intracavitary brachytherapy. The dose distributions of treatment plans were compared to the points A, B and ICRU bladder and rectum reference points located in the relevant clinical planes. The results show(More)
PURPOSE To investigate the prognostic impact of lymph node ratio (LNR) on survival in the patients with Stage III rectal cancer. METHODS AND MATERIALS We retrospectively reviewed the data of 421 consecutive patients who underwent total mesorectal excision followed by chemoradiotherapy for rectal cancer from 1996 to 2006. The 232 patients with positive(More)
PURPOSE To evaluate the effect of postoperative concurrent chemoradiotherapy using three-dimensional conformal radiotherapy and to identify the prognostic factors that influence survival in patients with extrahepatic bile duct cancer. METHODS AND MATERIALS We retrospectively analyzed the data from 101 patients with extrahepatic bile duct cancer who had(More)