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Bone scintigraphy as a new imaging biomarker: the relationship between bone scan index and bone metabolic markers in prostate cancer patients with bone metastases

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Abstract

Objective

A computer-aided diagnosis system for bone scintigraphy with a semiquantitative index from the Bone Scan Index (BSI) has been used to quantify the spread of bone metastases. However, few papers have made clear associations among BSI, bone metabolic markers, and prostate-specific antigen (PSA). This retrospective study aimed to examine these relationships in prostate cancer patients with bone metastases.

Methods

A total of 158 scans from 52 patients (number of median examinations/person 3, range 1–8; median age 71 years, age range 46–86) were included. The intervals between bone scans and blood examinations were 0–16 days (median 0 day). The serum markers of PSA, pyridinoline cross-linked carboxy-terminal telopeptide of type I collagen (1-CTP), bone alkaline phosphatase (BAP), and tartrate-resistant acid phosphatase-5b (TRACP-5b) were examined. Subjects were divided into 4 groups according to BSI; Group A: 0 to <2, Group B: 2 to <4, Group C: 4 to <8, and Group D: over 8. BSI, which corresponded to the amount of metastatic lesion, was automatically calculated by BONENAVI® software (FUJIFILM RI Pharma, Co. Ltd., Tokyo, Japan; Exini Bone, Exini Diagnostics, Sweden).

Results

All bone scans showed high uptake with bone metastases. BSI was correlated significantly with the serum 1-CTP, serum BAP, serum TRACP-5b, logBAP, logTRACP-5b, and logPSA (r = 0.39, 0.66, 0.69, 0.71, 0.62 and 0.41, respectively). BSI did not correlate significantly with the serum PSA. The statistical F value was 11 in the serum 1-CTP, 31 in serum BAP, 29 in logBAP, 19 in serum TRACP-5b, 14 in logTRACP-5b, 3 in serum PSA, and 9 in logPSA by analysis of variance. Comparison by Dunnett’s test showed significantly higher values in Group D for all original bone metabolic markers and the logPSA, Group C for the serum BAP, logBAP, serum TRACP-5b, and logTRACP-5b, and Group B for the logTRACP-5b compared with Group A.

Conclusion

The changes in BSI showed a close relationship with all bone metabolic markers but not with the serum PSA. The BSI is confirmed to reflect the activity and extent of bone metastases, and can be used as an imaging biomarker.

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Correspondence to Hiroshi Wakabayashi.

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Wakabayashi, H., Nakajima, K., Mizokami, A. et al. Bone scintigraphy as a new imaging biomarker: the relationship between bone scan index and bone metabolic markers in prostate cancer patients with bone metastases. Ann Nucl Med 27, 802–807 (2013). https://doi.org/10.1007/s12149-013-0749-x

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  • DOI: https://doi.org/10.1007/s12149-013-0749-x

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