100 The study found that although the rate of positive family history of 1.8% was lower compared to that seen in Western selleck countries, the population relative risk of developing UC was similar in subjects with a positive family history when compared to the West. The peak age of diagnosis is similar to the West.
Level of agreement: a-93%, b-7%, c-0%, d-0%, e-0% Quality of evidence: II-2 Classification of recommendation: A Numerous epidemiological studies from the Asia-Pacific region described similar age ranges of UC patients, which mirror those in the West.58,59,62,73,74,77,78 A Japanese study documented an age range of 6–92 years, supporting the notion that UC can occur at any age.59 Except for a Korean study that showed a second peak in the 6th to 7th decade similar to the West, the other studies from Asia-Pacific showed a single peak in the range of 30–40 years of age.58,101 The male and female sex distribution in UC is approximately
equal. Level of agreement: a-93%, b-7%, c-0%, d-0%, e-0% Quality of evidence: II-2 Classification of recommendation: B Aside from two tertiary center cohorts which reported a male predominance among UC patients (1.5–1.8:1), all other hospital-based studies do not show a difference.59,73,85 Larger population based studies from Korea, Japan and New Zealand have not reported any gender differences, similar to those in the West.58,78,80,99 Primary sclerosing cholangitis (PSC) associated Ku-0059436 mouse with UC is less prevalent 上海皓元医药股份有限公司 in the Asia-Pacific region compared to the West Level of agreement: a-93%, b-7%, c-0%, d-0%, e-0% Quality of evidence: II-2 Classification of recommendation: C PSC occurs in UC patients with a prevalence of 2–7% in Western studies.102 There is a paucity of data on PSC in UC individuals in the Asia-Pacific region. From tertiary centers with a cohort size of more than 200 patients, the prevalence rate was documented to be 0–2.2%.57,73,85 There is a lack of such data on PSC in UC patients from Australia and New Zealand. Dysplasia and colorectal cancer (CRC) are recognized complications of long-standing UC but further long-term data
on the cumulative risk attributable to UC are required in the AP region Level of agreement: a-80%, b-20%, c-0%, d-0%, e-0% Quality of evidence: II-3 Classification of recommendation: C The prevalence of CRC in UC patients in the Asia-Pacific region ranges from 0.3–1.8%.57,62,73,77,85,103 However, many of these reports have relative short duration of follow up (mean duration less than 10 years) and did not capture cumulative incidence rates. Data from UC patients in India reported the risk of CRC of 0% at 10 years, 2.3% at 20 years and 5.8% for those with UC for more than 20 years. These rates are lower than that of a Western meta-analysis, which reported rates of 1.6% at 10 years, 8.3% at 20 years and 18.4% at 30 years.