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although the researchers in asia have proposed an asian definition for sarcopenia , which includes different cutoff values of muscle mass , muscle strength , and physical performance than that for western countries,6 , 7 there has been no distinct asian definition for cachexia so far .
a simple quotation from the global definition of cachexia8 has been included in the clinical guidelines for infusion therapy in advanced cancer patients 2013 edited by the japanese society for palliative medicine , which is the only one cachexia definition with a cutoff for weight loss in japan.9 no other definition of cachexia is shown in guidelines for chronic diseases such as heart failure , chronic obstructive pulmonary disease ( copd ) , or chronic kidney disease ( ckd ) . regarding heart failure , unintentional weight loss
is alerted as cachexia in guidelines for treatment of acute heart failure.10 for copd patients , nutritional evaluation including weight assessment are recommended in a section of 
nutrition management in the guidelines for the diagnosis and treatment of copd ( 3 edition ) without referring to cachexia itself.11 in ckd guidelines , continual diet therapy is recommended without referring to cachexia itself.12 lack of distinct cachexia definitions in japan does not necessarily mean that researchers have accepted the global definition but may rather suggest that many researchers have not paid much attention to cachexia .
in fact , there seems to be only one epidemiological research study reporting the prevalence of cachexia using weight loss as a part of the definition .
kimura et al . retrospectively reviewed the clinical data of consecutive patients with stage iii or iv nonsmall cell lung cancer who had received their firstline chemotherapy , after having excluded those who were candidates for curative radiotherapy or who had received palliative radiotherapy.13 cachexia , defined as a body weight loss > 5% over the past 6  month or > 2% in patients with a bmi < 20  kg / m , was observed in 45.6% of the overall cohort , and its presence was associated with a poor prognosis .
although this number is within the range of western countries ( the prevalence ranging from 28 to 57% in advanced cancer14 and 5080% in several types of cancer15 ) , we can not compare the prevalence of cachexia in other types of cancer , heart failure , copd , and ckd between japan and western countries .
hence , here we listed epidemiologic researches  suggesting the prevalence of cachexia , which includes bmi data in chronic diseases ( table 1 ) . in recent years
, a significant amount of data has been updated . however , many of these reports16 , 17 , 18 , 19 , 20 , 21 had criteria including only bmi cutoff of 18.5  kg / m , which is related to the world health organization definition of 
malnutrition.22 table 1 includes the data with tertile or quantile value of bmi , if the value is close to 20  kg / m , which is one of the criteria in universal cachexia definition.1 the lack of data with regards to weight loss in most of the listed reports may be because of the fact that such data can not be assembled from many databases in retrospect , if the researchers did not record the history of weight loss at the beginning of the studies . according to the epidemiologic data with bmi , onethirds of japanese heart failure patients had a bmi < 20.3 
kg / m 
 23 whereas the prevalence of underweight ( bmi < 20.7  kg / m ) was 13.6% in reports from western countries.24 these data may suggest that there are more cachectic heart failure patients in japan than in western countries , or that the use of the same definition as in western countries can overestimate the prevalence of cachexia in japan .
although direct comparisons between japan and western countries can not be performed either in ckd and copd , the reported lowest quartile value of bmi ( 19.6  kg / m ) in ckd25 may match the prevalence of western countries ( 3060%14 ) . in copd ,
the rate of low bmi ( < 20  kg / m ) and underweight ( bmi < 18.5  kg / m ) patients were 41%26 and 31%,21 which seem to be high in comparison with the prevalence of cachexia in western countries ( 2735%).14 
  epidemiologic researches suggesting the prevalence of cachexia bmi , body mass index ; ckd , chronic kidney disease ; copd , chronic obstructive pulmonary disease ; ct , chemotherapy ; cvd , cardiovascular diseases ; hf , heart failure ; nsclc , nonsmall cell lung cancer .
as expected by the lack of epidemiologic data in cachexia , most of observational / interventional studies in japan have been based on various definitions for cachexia .
table 2 shows observational / interventional parallelgroup comparison studies using some clear definitions for cachexia .
there are wide difference among studies in the definition of cachexia , although some of them have taken weight loss into account as part of the definition.27 , 28 , 29 , 30 , 31 , 32 , 33 four interventional studies using ghrelin and octanoic acidrich formula have been reported in the field of copd , including two studies with weight loss > 7.5% over 6  months32 , 33 and 2 studies with bmi < 21  kg / m 
 34 , 35 as the definition of cachexia . on the other hand ,
there is no published interventional research targeting cachexia in cancer , heart failure , and ckd .
most of the studies in cancer and heart failure focused on blood levels of hormones or cytokines in those with and without cachexia , but used definitions for cachexia that are completely different from each other .
two of them did not include body weight , but only included cancer stage36 or blood markers37 as definitions of cachexia .
the other studies in cancer had an endpoint of weight loss and inflammatory responses38 , 39 without any definition of cachexia .
the reasons for such a wide variety of inclusion criteria are not clear , but it could be speculated that the researchers intended to simplify the enrollment of patients.40 although the number of clinical trials targeting cachexia is very limited in japan so far , researchers may have a potential to produce more evidence in this field , having fruitful results as their background especially in the field of basic research.41 further studies targeting cachexia patients defined by universal criteria are desirable when we consider to apply the results for western countries .
observational and interventional studies for cachexia and definitions bmi , body mass index ; copd , chronic obstructive pulmonary diseases ; gps , the glasgow prognostic score ; calculated using serum albumin and c reacting protein , hf ; heart failure .
in recent years , many epidemiological data have been updated reporting the distribution of bmi in chronic diseases in japan , however , most of them have not referred to the definition of cachexia .
the clinical course and background of cachectic patients in japan may be different from that of patients in western countries .
there have been several observational studies comparing patients with and without cachexia , but the definitions of cachexia used have widely varied among studies .
interventional clinical trials for cachectic patients are still lacking especially in cancer , heart failure , and ckd .
further studies are needed to assess the epidemiologic / pathological background , as well as the effect of therapeutic approach , in cachexia .
abstracteven though most clinical data on cachexia have been reported from western countries , cachexia may be a growing problem in asia as well , as the population in this area of the world is considerably larger . 
 considering the current definitions of obesity and sarcopenia in japan , which are different from the ones in western countries , the lack of a distinct cachexia definition in japan is strinking . 
 only one epidemiological study has reported the prevalence of cachexia using weight loss as part of the definition in patients with stage iii or iv nonsmall cell lung cancer . 
 although the reported prevalence of 45.6% is within the range of that in western countries ( 2857% in advanced cancer ) , we can not compare the prevalence of cachexia in other types of cancer , heart failure , chronic obstructive pulmonary disease ( copd ) , and kidney disease ( ckd ) between japan and western countries . in patients with heart failure , 
 one third of japanese patients has a body mass index < 20.3  kg / m2 whereas the prevalence of underweight is 13.6% in reports from western countries . 
 these results may suggest that there are more cachectic heart failure patients in japan , or that using the same definition like western countries leads to gross overestimation of the prevalence of cachexia in japan . 
 the rate of underweight patients in copd has been reported as 3141% in copd and seems to be high in comparison to the prevalence of cachexia in western countries ( 2735% ) . 
 the reported lowest quartile value of bmi ( 19.6  kg / m2 ) in ckd may match with the prevalence of cachexia in western countries ( 3060% ) . 
 the number of clinical trials targeting cachexia is very limited in japan so far .