4707
The first aptamer therapeutic was FDA approved in 2005 and a number of novel aptamer - based therapeutics are currently undergoing clinical trials for treating diseases such as macular degeneration , choroidal neovascularization , intravascular thrombus , acute coronary syndrome , von Willebrand factor related disorders , von Hippel - Lindau syndrome ( VHL ) , angiomas , acute myeloid leukemia , renal cell carcinoma , non - small cell lung cancer , thrombotic thrombocytopenic purpura , and several others .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None