According to researcher introduction, arrive from 1988 1997, village of Ding of 45 city of Japanese whole nation is close 16 thousand males are labelled to investigate an object, this investigation aims ascertain time going to work paragraph come on with prostate cancer the relation between.

All be investigated in the male go up for a long time of day shift have 12756 people, go up for a long time of evening shift have 1184 people, the job that additionally 1966 people pursue needs their day and night to change shifts.

Dogging in research, 55 people are finally by diagnose prostate cancer, go up among them of day shift have 38 people, go up the 6 people of evening shift, the 11 people that day and night changes shifts. In addition, researcher returns the familial prostate that studied a patient integratedly the difference of cancerous medical history and age, district. Final statistical result shows, the odds that the male that day and night changes shifts contracts prostate cancer is to go up for a long time the 3.5 times; of the male of day shift and go up for a long time the male of evening shift and on between the male of day shift, sicken odds does not have a difference almost from the point of statistical data.

Researcher says, according to the research of heretofore, irregular order causes human body biological clock disorder, make have the fade black hormone that controls function of hyperplasia of prostate cancer cell to secrete a quantity to drop, this can explain probably why to go to work time not regular male contracts prostate cancer more easily.

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(The exercitation edits: Huang Xilin)