The burden of skin diseases: 2004 a joint project of the American Academy of Dermatology Association and the Society for Investigative Dermatology.

Skin disease is one of the top 15 groups of medical conditions for which prevalence and health care spending increased the most between 1987 and 2000, with approximately 1 of 3 people in the United States with a skin disease at any given time. Even so, a national data profile on skin disease has not been conducted since the late 1970s. This study closes the gap by estimating the prevalence, economic burden, and impact on quality of life for 22 leading categories of skin disease. The estimated annual cost of skin disease in 2004 was 39.3 billion dollars, including 29.1 billion dollars in direct medical costs (costs of health services and products) and 10.2 billion dollars in lost productivity costs (defined as costs related to consumption of medical care, costs associated with impaired ability to work, and lost future earning potential because of premature death). Based on a methodology of willingness to pay for symptom relief, the additional economic burden of skin disease on quality of life amounted to an estimated 56.2 billion dollars. Including the economic burden on quality of life, the total economic burden of skin disease to the US public in 2004 was approximately 96 billion dollars.

Episcleral plaque brachytherapy for retinoblastoma.

BACKGROUND: The purpose of this study was to report our experience using episcleral plaque brachytherapy (EPBRT) to treat retinoblastoma and to demonstrate its applicability in multimodality treatment. PROCEDURE: We treated 26 tumors in 25 eyes from a group of 21 children with unilateral (n = 4) or bilateral (n = 17) retinoblastoma. The group comprised 8 girls and 13 boys; the median age was 25 months (range: 2-64 months) at the time of EPBRT. Iodine-125 ((125)I) was used for all applications. The median dose was 44 Gy (range: 35-47.6 Gy). EPBRT was administered primarily at the time of relapse after primary chemotherapy or radiation therapy. RESULTS: For eyes treated with EPBRT, the eye preservation rate was 15/25 with a median follow-up of 47 months (range: 2-198 months); the lesion control rate was 25/26 with a median follow-up of 13 months (range: 1-140 months). The median time to additional whole-eye treatment after EPBRT was 12 months (range: 2-105 months). CONCLUSIONS: Similar to previously reported series, EPBRT shows a high rate of successful tumor control as a primary treatment for retinoblastoma, as well as a secondary therapy at the time of relapse. EPBRT also allows for a clinically significant delay in the time to additional measures for the affected eye. Therefore, EPBRT should be considered as a form of local ophthalmic therapy that avoids or delays the use of external-beam radiotherapy, especially for patients primarily treated with chemotherapy who might require consolidation therapy.

Early neuro-otologic effects of three-dimensional irradiation in children with primary brain tumors.

PURPOSE: Central nervous system (CNS) irradiation can cause sensorineural hearing loss. The relationship between the dose to the cochlea and the development of hearing loss is unknown. Conformal radiation therapy (CRT) techniques facilitate accurate cochlear dosimetry. We modeled hearing threshold levels (HTL) after CRT in children with localized primary brain tumors (ependymoma, low- or high-grade astrocytoma, craniopharyngioma, or CNS germinoma) by using cochlear dose and clinical variables. PATIENTS AND METHODS: We evaluated 72 children (median age, 9.5 years) with audiograms before and every 6 months after CRT (median follow-up, 16.6 months; range, 4.3-42.6 months). We used a mixed-effects model to predict change in hearing for each ear as a function of time, cochlear dose, and clinical variables. RESULTS: Hearing was affected the greatest in patients with CSF shunts and pre-CRT ototoxic chemotherapy, enhanced by cochlear dose, and was more prominent on the right side. Hearing impairment after CRT alone occurred at low and intermediate frequencies in patients with shunts and supratentorial tumors when the cochlear dose exceeded 32 Gy. Patients with shunts and central supratentorial tumors developed intermediate-frequency hearing loss after CRT alone regardless of dose. CONCLUSIONS: Hearing loss during the first 4 years after CRT alone is uncommon, although patients with shunts and supratentorial tumors appear to be at increased risk for low- and intermediate-frequency effects. CSF shunting and increased cochlear dose enhance the effect of ototoxic chemotherapy. If possible, the average cochlear dose should be <32 Gy over a 6-week course of treatment until more specific dose data become available.

Ocular preservation after 36 Gy external beam radiation therapy for retinoblastoma.

PURPOSE: The purpose of this study was to document the ocular preservation rate after 36 Gy external beam radiation therapy (EBRT) for retinoblastoma. PATIENTS AND METHODS: Forty-nine eyes of 38 patients were treated with a median dose of 36 Gy EBRT. The patient population included 7 unilateral and 31 bilateral presentations, with a median age at diagnosis of 4 months. Eyes enucleated at the time of diagnosis or treated with other measures were not included in the analysis of ocular preservation. The median age at EBRT was 8 months. Patients were monitored for progression of disease after EBRT and second malignant neoplasms. RESULTS: The median follow-up was 88.6 months, with an estimated ocular preservation rate of 82.0% +/- 5% at 10 years. There was a difference in the ocular preservation rates for patients with advanced disease (Reese-Ellsworth group III-V) compared with early disease. Metastatic disease developed in two patients, and a second malignant neoplasm developed in three. Patients treated with en face electrons experienced a lower 5-year estimate of ocular preservation than those treated with photons, although patients treated with electrons were more likely to have advanced disease. CONCLUSIONS: The use of low-dose EBRT (36 Gy) results in ocular preservation rates that are comparable to those of high-dose EBRT. The use of electrons requires careful treatment planning and computerized dosimetry.