Validation and comparison of tumor-associated trypsin inhibitor (TATI) immunoassays

► Nutritional status or type of blood collection does not affect serum TATI concentration. ► Serum samples are stable at least for 4 weeks at + 4 °C and − 20 °C. ► Serum TATI is stable for at least four freeze-thaw cycles. ► The ELISA and especially the TR-IFMA are more sensitive TATI assays than the RIA. ► Serum TATI is higher in women and in men > 70 years of age.