Kenichi Ando

Gifu University, Gihu, Gifu, Japan

Are you Kenichi Ando?

Claim your profile

Publications (6)8.62 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: To assess the clinical outcomes of single or oligo-fractionated stereotactic radiotherapy (SRT) using dynamic conformal arcs (DCA) for head and neck tumors (HNTs). Thirty-four consecutive patients with 35 lesions treated between 2005 and 2009 were retrospectively evaluated, of whom 85.7 % had recurrent or metastatic disease, and 45.7 and 34.3 % had previous radiotherapy and surgery, respectively. The median SRT dose was 22.3 Gy (11.2-32.8) in 2-4 fractions with a median interval of 7 days and 10.4 Gy (9.2-12.4) in one fraction. SRT was combined with upfront conventionally fractionated RT in 48.6 % of patients. The median follow-up periods were 18.4 months (2-84.1) for the entire cohort and 49.6 months for the survivors. The 1- and 2-year local control (LC) rates were 84.3 and 70.5 %, with the 1- and 2-year overall survival (OS) rates of 78.6 and 51.6 %. LC was significantly better for tumor volumes <25.6 cm(3) (p = 0.001). OS was significantly longer in patients without any disease outside the SRT site (p < 0.001), whereas LC after the SRT did not affect the OS. Late adverse events occurred in 9 patients, including cranial nerve (CN) injury (grade 3/4) in 2, brain radionecrosis in 5 (grade 1), and fatal bleeding in 2 patients harboring uncontrolled lesions abutting the carotid artery. DCA-based SRT can confer relatively long-term LC with acceptable toxicity in selected patients with HNTs. The patients with CN involvement or tumor volume ≥25.6 cm(3) were deemed unsuitable for this treatment regimen.
    Journal of Cancer Research and Clinical Oncology 04/2012; 138(9):1511-22. · 2.91 Impact Factor
  • Nihon Kikan Shokudoka Gakkai Kaiho 01/2009; 60(5):433-439.
  • [Show abstract] [Hide abstract]
    ABSTRACT: Pleomorphic adenoma is the most common parotid gland neoplasm and occasionally arises from the deep lobe of the parotid gland with extension into the parapharyngeal space. However, ossification of pleomorphic adenoma is rare, although chondroid and myxochondroid tissue formation is frequently seen histologically. We report an unusual case of ossifying pleomorphic adenoma arising from the deep lobe of the parotid gland in the parapharyngeal space.
    Australasian Radiology 01/2008; 51 Suppl:B173-5. · 0.51 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: An elevation of plasma vasopressin levels has been frequently observed in Meniere's disease patients. However, little is known regarding the mechanism behind this elevation. The plasma vasopressin levels and plasma osmolality were therefore determined in 18 diagnosed Meniere's disease patients and 20 patients with other types of vertigo, who required admission for severe vertigo attacks. All participants were given questionnaires regarding their clinical and psychological status, including their stress levels and depression status, to evaluate environmental stress events. The plasma vasopressin levels of Meniere's disease patients in the acute phase (4.1 +/- 1.37 pg/ml) were significantly higher compared with with those of other vertigo patients in the acute phase (2.1 +/- 0.41 pg/ml) (P < 0.01). The average plasma osmolality of the Meniere's disease group was higher than that of the other vertigo patients group (P < 0.05). No significant difference in reported stress levels, depression status and prevalence of primary headache between the groups was observed. The plasma vasopressin showed no significant correlation with the patients' clinical data (occurrence of emesis or nausea, prevalence of primary headache, depression status and stress). No correlation between the plasma vasopressin and the plasma osmolarity was observed in the Meniere's disease group. These results suggest that the elevation of plasma vasopressin in the acute phase of Meniere's disease is therefore related to the pathogenesis of Meniere's attacks, and the results obtained may provide helpful information for distinguishing between Meniere's disease and other various inner ear diseases.
    Journal of Neuroendocrinology 11/2007; 19(11):901-6. · 3.33 Impact Factor
  • Equilibrium Research. 01/2007; 66(3):110-115.
  • [Show abstract] [Hide abstract]
    ABSTRACT: An elevation of the plasma antidiuretic hormone (ADH) levels has frequently been observed in Meniere's disease patients. However, little is known regarding the mechanism behind such an elevation of ADH level in Meniere's disease patients. Therefore, we measured the plasma ADH in Meniere's disease patients and other vertigo patients to elucidate the association between the ADH levels, stress levels and the development of Meniere's symptom. The plasma ADH levels and plasma osmotic pressure were determined in 23 definite Meniere's disease patients and 160 patients with other types of vertigo/dizziness. All participants were administered questionnaire regarding their psychological status including their stress levels. The ADH levels of Meniere's disease patients in the acute phase (5.80 +/- 1.37 pg/mL) were significantly higher in comparison with that of Meniere's disease patients in the remission phase (2.26 +/- 0.41 pg/mL) (P < 0.05). In other peripheral vertigo patients, the ADH level in the acute phase (1.71 +/- 0.23 pg/mL) was not significantly different from that in the remission phase (1.45 +/- 0.15 pg/mL). Meniere's disease patients in the acute phase had a significantly higher stress score (114 +/- 23) than Meniere's disease patients in the remission phase (56 +/- 13) (P < 0.05). However, there was no significant correlation between their stress score and the ADH levels. These results suggest that the elevation of the plasma ADH levels in Meniere's disease patients in the acute phase is, therefore, associated with the pathogenesis of Meniere's disease attacks rather than with stress.
    Clinical otolaryngology: official journal of ENT-UK; official journal of Netherlands Society for Oto-Rhino-Laryngology & Cervico-Facial Surgery 12/2005; 30(6):521-5. · 1.87 Impact Factor