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A common misconception is that any deviation of motor pattern seen in the abnormal population should be corrected. However, in the present study we emphasize the importance of redundancy of the motor control system which gives the central control structures options for solving motor problem. The motor redundancy can provide the diverse strategies to solve the motor problem and the movement pattern in impaired or atypical population may serve to provide reflections of the changed center nervous system' priorities. Thus, therapeutic approaches should be on achieving goals rather than on producing set movement pattern. If the abnormal movement pattern achieves the desired functional goal, then the movement should not be corrected simply because it is not normal.
Owing to the development of diagnostic techniques and treatment modalities, more and more cases of multiple primary cancers are being discovered and active researches concerning maltiple primary cancers are being done. The mortrality due to cancers of gastrointestinal tract occupies more than two thirds (68.4%) of total number of deathes due to cancers in Korea, but researches on multiple primary cancers concerning gastrointestinal tract are lacking. We reviwed 70 cases of multiple primary cancers concerning gastrointestinal tract, we experienced in the past decade. The ratio of male to female was 3.7:1, the mean age was 52.8 years. From 70 patients with multiple primary cancers, sixty patients had synchronous multiple primary cancers and ten patients had metachronous ones. The frequent sites involved were stomach (51.9%) and liver (21.2%). The most frequent combination of primary and secondary cancer was stomach cancer and primary liver cancer (27%). These results may be contributed to the actual incidence of each cancer, and routine staging work-up of liver for stomach cancer and routine gastroopy for primary liver cancer. In synchronous cancers, majority of the second cancers were found incidentally during routine staging work-up (58.3%) or during operation (8.4%), whereas only 33.3% of second cancers were found due to concomittent symtoms. Thus the incidence of each multiple primary cancer in our study may reflect the relative frequency of each cancer in Korea. In order to determine the true risk of occurrence of multiple primary cancers in Korea, prospective studies based on the large population of community should be conducted.