NIPH Clinical Trials Search

UMIN ID: UMIN000000936

Registered date:12/12/2007

Phase I-II study for therapeutic efficacy of local recombinant human local insulin like growth factor 1 treatment via biodegradable gelatin hydrogels for acute sensorineural hearing loss

Basic Information

Recruitment status Complete: follow-up complete
Health condition(s) or Problem(s) studiedacute sensorineural hearing loss
Date of first enrollment2007/12/01
Target sample size25
Countries of recruitmentJapan
Study typeInterventional
Intervention(s)The registration period for this study is from December 17, 2007 to September 3, 2009. The observation period for the patients is 24 weeks. Biodegradable gelatin hydrogels are made from gelatin in a clean room at the department of Pharmacy, Kyoto University Hospital. Mecasermin (recombinant human IGF1, Somazon 10mg for injection, Astellas Pharma Inc, Tokyo, Japan) is dissolved in physiological saline, and the final concentration is 10mg/mL. A 30ul of Mecasermin solution is mixed with 3mg biodegradable hydrogels 60min before application. The hydrogel containing 300ug Mecasermin is placed in the round window niche in the middle ear. In the current study, a single application is used.


Primary OutcomeThe therapeutic effects are evaluated 12 weeks after the treatment, using pure tone audiometry. The criteria for hearing improvement, which was determined by the sudden deafness research committee of the Japanese Ministry of Health, Labour and Welfare in 1984, is used in this study. Complete recovery is defined as recovery of a hearing level within 20 dB at all five frequencies tested: 0.25, 0.5, 1.0, 2.0 and 4.0 kHz or recovery to the same level as the opposite side. Marked recovery is defined as more than 30 dB recovery in the mean hearing level at the five frequencies tested. Slight recovery is defined as recovery of 10-29 dB in the mean hearing level at the five frequencies tested. No response is defined as less recovery than 10 dB in the mean hearing level at the five frequencies tested.
Secondary OutcomeKey secondary outcomes are included the ratio of the emergence of adverse events, and the gain of hearing levels of the pure-tone average (0.25, 0.5, 1, 2, 4 kHz) 12 or 24 weeks after the treatment.

Key inclusion & exclusion criteria

Age minimum20years-old
Age maximumNot applicable
GenderMale and Female
Include criteria
Exclude criteriaThe exclusion criteria are as follows; (1) presenting active chronic otittis media, acute otittis media, otittis media with effusion or dysfunction of the auditory tube, (2) history of previous other treatments including systemic application of batroxobin, progtagrandin I, and hyper oxygen therapy, except for systemic steroid application, (3) presenting malignant tumors, (4) presenting severe liver dysfunction (AST>100, ALT >100), (5) presenting uncontrolled diabetes (HbA1c>10), (6) presenting pituitary or adrenal dysfunction, (7)severe systemic illness with an expected life expectancy, (8) pregnant or lactating women, (9) history of drug allergy, (10) treated with batroxobin or prostagrandin E1or I after the onset of hearing loss, (11) past history of alcohol or drug dependence within 1 year, (12) individuals who are diagnosed as inappropriate for the trial (ie: difficulty in a 24-week follow up).

Related Information


public contact
Name Takayuki Nakagawa
Address Japan
Affiliation Kyoto University Hospital Otolaryngology, Head and Neck Surgery
scientific contact
Name Juichi Ito
Address Kawaharacho 54, Shogoin, Sakyoku, Kyoto Japan
Affiliation Kyoto University Graduate School of Medicine Otolaryngology, Head and Neck Surgery