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Reduced uptake of the proliferation-seeking radiotracer technetium-99m-labelled pentavalent dimercaptosuccinic acid in a 47-year-old woman with severe breast epithelial hyperplasia taking ibuprofen: a case report
© Papantoniou et al; licensee BioMed Central Ltd. 2010
Received: 21 October 2009
Accepted: 17 March 2010
Published: 17 March 2010
Recent studies have reported a risk reduction in the progression of benign breast disease to breast carcinoma through COX-2 pathways.
We present a case of severe epithelial hyperplasia in a 47-year-old woman with increased breast density submitted to scintimammography by the proliferation-imaging tracer Technetium-99m-labelled pentavalent dimercaptosuccinic acid, before and after an oral ibuprofen treatment for 4 weeks. The radiotracer uptake after ibuprofen intake was significantly reduced, both visually and by semi-quantitative analysis, based on a calculation of lesion-to-background ratios.
In proliferating breast lesions, scintigraphically displayed reduction in Technetium-99m-labelled pentavalent dimercaptosuccinic acid uptake may indicate inhibition by ibuprofen in the pathway of malignant epithelial cell transformation.
Several epidemiological and laboratory studies suggest that non-steroidal anti-inflammatory drugs (NSAIDs) may have chemo-preventive effects in breast cancer, owing to their activity against cyclo-oxygenase-2 (COX-2), the rate-limiting enzyme in the prostaglandin cascade . Recent studies have suggested that inflammation through COX-2 pathways may play a role in the progression of benign breast disease to breast carcinoma, and that aspirin may reduce this risk in women with similar lesions . Significant reductions in the risk of malignant transformation have been reported with selective COX-2 inhibitors, as well as with over-the-counter non-steroidal anti-inflammatory drugs, including ibuprofen and naproxen .
Another important related consideration is the postulated association between benign proliferating breast disease, mammographic density, and subsequent malignant transformation [2–4]. Technetium-99m-labelled pentavalent dimercaptosuccinic acid (99mTc-(V)DMSA) is a tumor-seeking radiotracer. Its relationship to focal adhesion kinase (FAK) activation and cellular proliferating activity has been described in previous reports not only for invasive but also for pre-invasive and benign proliferating breast lesions [5–8]. This case report was undertaken to investigate whether a reduced rate of cellular proliferation, mediated by ibuprofen as described in previous retrospective studies, could be visualized by alterations in the patient's 99mTc-(V)DMSA uptake ratio.
After intravenous administration of 925MBq of the tracer, early and late planar (lateral prone and anterior supine) images were acquired at 10 minute and 60 minute after injection. Breast 99mTc-(V)DMSA uptake in the early and late images was evaluated visually. Quantitative comparisons between the 10 minute and 60 minute scans and between the baseline study before biopsy and after the course of ibuprofen were performed by drawing regions of interest (ROIs) over the breast sites of greatest tracer uptake and over the normal breast parenchyma. The lesion-to-background (L/B) ratios were then calculated and compared between the same corresponding breast areas in the two scintigraphic studies.
Our key finding is that a short period of ibuprofen treatment resulted in a 27% reduction in the uptake of 99mTc-(V)DMSA in a case of proliferative benign epithelial breast hyperplasia. Other recent studies have shown that COX-2 inhibitors may reduce the risk of breast cancer . Specifically, a retrospective study of almost 1000 women showed that a selective COX-2 inhibitor, celecoxib 200 mg/day for at least two years, reduced the risk of breast cancer by 83%, while rofecoxib 25 mg/day reduced the risk by 64% . The non-selective COX inhibitors aspirin and ibuprofen and/or naproxen gave a reduced odds ratio (0.49 and 0.37, respectively, with 95% confidence intervals) for the incidence of breast cancer compared with non-use. Moreover, the odds ratio for breast cancer by dose and frequency was 0.28 for ibuprofen 200 mg more than 3 times weekly. In this context, other investigators have suggested that inflammation mediated through COX-2 pathways may play a role in the progression of benign breast disease to carcinoma, and that aspirin may reduce such risk in women with benign breast disease .
99mTc-(V)DMSA is a tumor-seeking tracer whose cellular uptake is linked to FAK activation and cell proliferation, which is a precocious stage of malignant transformation [6, 7, 9]. Compared with invasive lesions, the exact mechanism of 99mTc-(V)DMSA accumulation in benign proliferating diseases and in some non-proliferating diseases with higher L/B ratios is not yet clear [5, 7]. Given that benign proliferating diseases generally have lower proliferation rate than invasive cancers, this raises the suspicion that 99mTc-(V)DMSA reflects an earlier cell activation status of phosphorylated FAK in the process of increasing the rate of cell proliferation [5, 6, 8]. Hence, in our case, the reduction in diffuse 99mTc-(V)DMSA uptake after a relatively short period (4 weeks) of ibuprofen treatment may indicate a "switch off" mechanism on activated FAK, rather than a slowing down of the proliferation rate. Although we have provided no biopsy confirmation after treatment, ibuprofen was the only treatment that our patient took between her scintimammographic studies. The biokinetic characteristics of 99mTc-(V)DMSA support our suggestion that the observed reduction in its uptake was attributable to ibuprofen-induced cyclo-oxygenase COX inhibition.
Our research so far has shown that diffuse tracer uptake during 99mTc-(V)DMSA scintimammography can be considered indicative of an underlying proliferative hyperplastic or in situ pathology. This report focuses on a patient with severe breast epithelial hyperplasia enrolled in a current prospective study. In another recent report on hyperplastic lesions , we studied the imaging properties and biokinetic characteristics of 99mTc-(V)DMSA in relation to mammographic density. As long as these lesions can be visualized, it would be of great clinical interest if we could estimate the effectiveness of various chemopreventive agents by quantifying their effect on 99mTc-(V)DMSA uptake.
Written informed consent was obtained from the patient for publication of this case report and any accompanying images. A copy of the written consent is available for review by the Editor-in-Chief of this journal.
We recognize with appreciation Dr. Lyra Stavroula for providing valuable support to the radiologic investigation.
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