PT  - JOURNAL ARTICLE
AU  - Deshayes, Emmanuel
AU  - Ladjohounlou, Riad
AU  - Le Fur, Pierre
AU  - Pichard, Alexandre
AU  - Lozza, Catherine
AU  - Boudousq, Vincent
AU  - Sevestre, Samuel
AU  - Jarlier, Marta
AU  - Kashani, Roxana
AU  - Koch, Joanna
AU  - Sosabowski, Jane
AU  - Foster, Julie
AU  - Chouin, Nicolas
AU  - Bruchertseifer, Frank
AU  - Morgenstern, Alfred
AU  - Kotzki, Pierre-Olivier
AU  - Navarro-Teulon, Isabelle
AU  - Pouget, Jean-Pierre
TI  - Radiolabeled Antibodies Against Müllerian-Inhibiting Substance Receptor, Type II: New Tools for a Theranostic Approach in Ovarian Cancer
AID  - 10.2967/jnumed.118.208611
DP  - 2018 Aug 01
TA  - Journal of Nuclear Medicine
PG  - 1234--1242
VI  - 59
IP  - 8
4099  - http://jnm.snmjournals.org/content/59/8/1234.short
4100  - http://jnm.snmjournals.org/content/59/8/1234.full
SO  - J Nucl Med2018 Aug 01; 59
AB  - We have developed the 16F12 mouse monoclonal antibody (mAb), which targets the Müllerian-inhibiting substance receptor, type II (MISRII), expressed by ovarian tumors. Here, we assessed in preclinical models the possibility of using radiolabeled 16F12 in a theranostic approach for small-volume ovarian peritoneal carcinomatosis, such as after cytoreductive surgery. Methods: DOTA-, DTPA- or deferoxamine mesylate–conjugated 16F12 mAb was radiolabeled with β-particle (177Lu) or α-particle (213Bi) emitters for therapeutic use and with 89Zr for PET imaging. On the 13th postxenograft day, mice bearing intraperitoneal MISRII-positive AN3CA endometrial carcinoma cell xenografts were treated by conventional intraperitoneal radioimmunotherapy (IP-RIT) with 10 MBq of 177Lu-16F12 or 12.9 MBq of 213Bi-16F12 or by brief intraperitoneal radioimmunotherapy (BIP-RIT) using 50 MBq of 177Lu-16F12 or 37 MBq of 213Bi-16F12. For BIP-RIT, 30 min after injection of the radiolabeled mAbs, the peritoneal cavity was washed to remove the unbound radioactivity. The biodistribution of 177Lu- and 213Bi-16F12 mAbs was determined and then used for dose assessment. Hematologic toxicity was also monitored. Results: The 16F12 mAb was satisfactorily radiolabeled for both therapy and imaging. IP-RIT with 177Lu-16F12 was slightly more efficient in delaying tumor growth than IP-RIT with 213Bi-16F12. Conversely, 213Bi-16F12 was more efficient than 177Lu-16F12 in BIP-RIT. The biodistribution analysis showed that the tumor-to-blood uptake ratio was significantly higher with BIP-RIT than with IP-RIT for both 213Bi- and 177Lu-16F12. Hematologic toxicity was more pronounced with 177Lu-16F12 than with 213Bi-16F12. SPECT/CT images (after BIP-RIT with 177Lu-16F12) and PET/CT images (after injection of 89Zr-16F12 in the tail vein) showed focal uptake at the tumor site. Conclusion: Radiolabeled 16F12 could represent a new theranostic tool for small-volume ovarian peritoneal carcinomatosis. Specifically, 213Bi-16F12–based BIP-RIT could be proposed to selected patients as an alternative adjuvant treatment immediately after cytoreductive surgery. An anti-MISRII mAb is currently being used in a first-in-human study, thus making radiolabeled anti-MISRII mAbs a realistic theranostic option for the clinic.