Castration-Resistant Prostate Cancer Tissue Acquisition From Bone Metastases for Molecular Analyses
Year: 2016
Type: article
Study design: Observational Study
Abstract: BACKGROUND: The urgent need for castration-resistant prostate cancer molecular characterization to guide treatment has been constrained by the disease's predilection to metastasize primarily to bone. We hypothesized that the use of clinical and imaging criteria could maximize tissue acquisition from bone marrow biopsies (BMBs). We aimed to develop a score for the selection of patients undergoing BMB. MATERIALS AND METHODS: A total of 115 BMBs were performed in 101 patients: 57 were included in a derivation set and 58 were used as the validation set. The clinical and laboratory data and prebiopsy computed tomography parameters (Hounsfield units [HUs]) were determined. A score for the prediction of biopsy positivity was developed from logistic regression analysis of the derivation set and tested in the validation set. RESULTS: Of the 115 biopsy specimens, 75 (62.5%) were positive; 35 (61.4%) in the test set and 40 (69%) in the validation set. On univariable analysis, hemoglobin (P = .019), lactate dehydrogenase (P = .003), prostate-specific antigen (P = .005), and mean HUs (P = .004) were selected. A score based on the LDH level (≥ 225 IU/L) and mean HUs (≥ 125) was developed in multivariate analysis and was associated with BMB positivity in the validation set (odds ratio, 5.1; 95% confidence interval, 1.9%-13.4%; P = .001). The area under the curve of the score was 0.79 in the test set and 0.77 in the validation set. CONCLUSION: BMB of the iliac crest is a feasible technique for obtaining tumor tissue for genomic analysis in patients with castration-resistant prostate cancer metastatic to the bone. A signature based on the mean HUs and LDH level can predict a positive yield with acceptable internal validity. Prospective studies of independent cohorts are needed to establish the external validity of the score.
Source: Clinical Genitourinary Cancer
Authors: David Lorente, Aurelius Omlin, Zafeiris Zafeiriou, Daniel Nava-Rodrigues, Raquel Pérez-López, Carmel Pezaro, Niven Mehra, Elizabeth Sheridan, Ines Figueiredo, Ruth Riisnaes, Susana Miranda, Mateus Crespo, Penny Flohr, Joaquín Mateo, Amelia Altavilla, Roberta Ferraldeschi, Diletta Bianchini, Gerhardt Attard, Nina Tunariu, Johann de Bono
Language: English
Subfield: Pulmonary and Respiratory Medicine
Field: Medicine
Domain: Health Sciences
Open Access status: hybrid
Estimated APC paid: $3,530
Funders: American Association for Cancer Research, Entertainment Industry Foundation, Movember Foundation, NIHR Biomedical Research Centre, Royal Marsden NHS Foundation Trust/Institute of Cancer Research, Cancer Research UK, National Institute for Health and Care Research, Department of Health and Social Care, Institute of Cancer Research, Prostate Cancer UK, Stand Up To Cancer, Medical Research Council
OpenAlex ID: W2347074754