Anti-carcinoembryonic antigen immunoscintigraphy (technetium-99m-monoclonal antibody BW 431/26) and serum CEA levels in patients with suspected primary and recurrent colorectal carcinoma
- Internal Department/Nuclear Medicine, Barmherzige Brueder Eggenberg Hospital, Graz (Austria)
This study comprises a total of 141 patients with suspected primary and recurrent colorectal carcinomas, in whom immunoscintigraphy with 99mTc-Mab BW 431/26 was performed. Whole-body scans were done 5.5 hr and SPECT imaging of the abdominal region was done at 6 and 24 hr postinjection of 1100 MBq 99mTc-labeled Mab (1 mg). In the course of primary tumor identification (n = 65), sensitivity of anti-CEA immunoscintigraphy was 95%, specificity 91%. In the diagnosis of early recurrences (n = 76), immunoscintigraphy was the method of choice to clarify the problem (sensitivity 94%; specificity 86%). Overall sensitivity of immunoscintigraphy in patients with suspected colorectal carcinomas and early recurrences was 95%, specificity 88%. Human anti-mouse antibodies were found in 29% (80% predominantly anti-isotypic, 20% predominantly anti-idiotypic). In contrast to anti-CEA immunoscintigraphy, the results of serum CEA levels were rather disappointing. Only 18 out of the 43 surgically verified primary colorectal carcinomas and 17 out of 32 patients with recurrences showed elevated serum CEA levels. In our clinical experience with this 99mTc-labeled anti-CEA antibody, immunoscintigraphy can play an important role in the identification of early colorectal recurrences and in postoperative colorectal cancer patients it should be performed in cases with unclear transmission computed tomography.
- OSTI ID:
- 5462229
- Journal Information:
- Journal of Nuclear Medicine; (United States), Vol. 32:7; ISSN 0161-5505
- Country of Publication:
- United States
- Language:
- English
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CARCINOEMBRYONIC ANTIGEN
BIOSYNTHESIS
CARCINOMAS
DIAGNOSIS
LARGE INTESTINE
RADIOIMMUNOSCINTIGRAPHY
SENSITIVITY ANALYSIS
RECTUM
ISOMERIC NUCLEI
MONOCLONAL ANTIBODIES
PATIENTS
SPECIFICITY
TECHNETIUM 99
ANTIBODIES
ANTIGENS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BODY
COUNTING TECHNIQUES
DIAGNOSTIC TECHNIQUES
DIGESTIVE SYSTEM
DISEASES
GASTROINTESTINAL TRACT
HOURS LIVING RADIOISOTOPES
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
INTESTINES
ISOMERIC TRANSITION ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
NEOPLASMS
NUCLEI
ODD-EVEN NUCLEI
ORGANS
RADIOIMMUNODETECTION
RADIOISOTOPE SCANNING
RADIOISOTOPES
SCINTISCANNING
SYNTHESIS
TECHNETIUM ISOTOPES
TRACER TECHNIQUES
YEARS LIVING RADIOI
550601* - Medicine- Unsealed Radionuclides in Diagnostics