MKI67 and spindle cell sarcoma: Of these, subcutaneous spindle cell sarcoma (n = 17) and splenic hemangiosarcoma (n = 9) had serum Ki-67 levels between 0.69 and 8.27 ng/mL (median 2.42 ng/mL) and between 0.99 and 7.19 ng/mL (median 2.27 ng/mL), respectively.