“…The remaining 4249 studies were excluded after removing irrelevant studies with the wrong study design or population and duplicates. 23 studies 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 investigated patients diagnosed with sarcoma, eight studies 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 investigated patients diagnosed with various rare cancers, while one study 50 investigated patients diagnosed with cholangiocarcinoma. 57,470 patients with rare cancers out of 1,287,082 participants were included.…”