Frequency of Various Malignant Diseases in Children Younger Than 10 Years Old in Yazd

[摘要] Introduction: According to the results of studies from different parts of the world, malignancies in children are rare. Despite this fact, malignant neoplasms remain the second leading cause of death in children after accidents.ALL, CNS tumors and lymphomas are the most common malignancies in children. They account for approximately more than 50% of malignancies and occur more frequently in boys than girls. There are 2 peak incidences early childhood and adolescence in the < 19 years old age group. The distribution of malignant diseases in the pediatric age group on the basis of age and sex has been evaluated in this study.Methods: This descriptive – observational study was done by cross- sectional method from 1998 till 2003. We evaluated the frequency and distribution of malignant diseases in children younger than 10 years old according to age and sex in Yazd. The files of children whose malignancy was confirmed by the pathological reports were studied and data related to age, sex, type of malignancy and time of admission was entered in the questionnaires. Results: Frequency and distribution of malignant diseases in male children < 10 years old is 60.4%which is more than females (39.6%). It is most frequent in children aged 6-7 years and least common in children

[学科分类] 药学、药理学、毒理学（综合）

[关键词] Adapted minicutting technique;Length of mini-cuttings;Mini-stumps shading;Ornamental plants cloning;Vegetative propagation.