Firstly, during the initial time intervals (5 min to 60 min p.i.), 99mTc-BN4 and 99mTc-BN3 showed high and significantly higher uptake than 99mTc-BN1, 99mTc-BN2, and 99mTc-BS in the tumor and the GRP-positive tissues, like the pancreas and intestinal tract. Here, GRP is linked to neoplasm.