IL1R2 and sarcoma: The first rule of our identified quantitative rule based on dataset-2 involves a unique peptide, HQKNDSANTVITTWLTRGSC, which can be further realigned to the protein interleukin-1 receptor type 2 with acceptable mismatches that contribute to the identification of sarcoma (Altschul et al., 1990; Mount, 2007; Pruitt et al., 2014).