Limited clinical benefit from trastuzumab in recurrent endometrial cancer: two case reports.
BACKGROUND
It is hypothesized that the HER-2/neu receptor could be used for targeted therapy in recurrent endometrial cancer.


METHODS
A patient with type II endometrial cancer (serous), showing strong HER-2/neu overexpression and gene amplification in both primary and recurrent tumor, received single-agent trastuzumab (3x weekly, 8 mg/kg loading, 6 mg/kg maintenance dose). Because of progression after 4 cycles, weekly paclitaxel-trastuzumab (80 mg/m(2) paclitaxel; trastuzumab 4 mg/kg loading, 2 mg/kg maintenance dose) was initiated. However, progressive disease was also noted after 11 weeks of combined treatment. A second patient, with recurrent type II endometrial cancer (grade III endometrioid), had HER-2/neu gene amplification in the primary tumor. However, biopsy from a lung metastasis 3 years later appeared to be HER-2/neu-negative.


CONCLUSIONS
Based on lack of response and changes in tumor biology, trastuzumab was of little clinical value in 2 cases of recurrent type II endometrial cancer. This report underscores the importance of reassessment of a recurrent tumor before initiating targeted treatment.
Vandenput
I
I
Leuven Cancer Institute, Division of Gynecological Oncology, UZ Gasthuisberg, Katholieke Universiteit Leuven, Leuven, Belgium.
Vanden Bempt
I
I
Leunen
K
K
Neven
P
P
Berteloot
P
P
Moerman
P
P
Vergote
I
I
Amant
F
F
D000368:Aged; D000911:Antibodies, Monoclonal / Q000627:therapeutic use*; D061067:Antibodies, Monoclonal, Humanized; D000970:Antineoplastic Agents / Q000627:therapeutic use*; D018269:Carcinoma, Endometrioid / Q000188:drug therapy* / Q000201:enzymology; D016889:Endometrial Neoplasms / Q000188:drug therapy* / Q000201:enzymology; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D017404:In Situ Hybridization, Fluorescence; D009364:Neoplasm Recurrence, Local / Q000188:drug therapy* / Q000201:enzymology; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000378:metabolism; D000068878:Trastuzumab
D000911:Antibodies, Monoclonal; D061067:Antibodies, Monoclonal, Humanized; D000970:Antineoplastic Agents; D018719:Erb-b2 Receptor Tyrosine Kinases; D000068878:Trastuzumab