SERPINB2 and neoplasm: Our findings indicate that a single local injection of 213Bi-PAI2 at a dose of 50 μCi (2.5 mCi kg−1) or a single i.p. injection of 213Bi-PAI2 at a dose of 6 mCi kg−1 can completely suppress tumour growth and prevent lymph node metastases for at least 8 weeks, while all control animals grew tumours and developed lymph node metastases.