哈佛大學(xué)醫(yī)學(xué)院,、麻省總醫(yī)院、威斯康辛大學(xué)醫(yī)學(xué)院的科學(xué)家在前列腺癌的早期診斷研究方面取得新的進(jìn)展,,相關(guān)成果文章Metabolomic Imaging for Human Prostate Cancer Detection公布在最新一期的Science Translational Medicine上。
前列腺癌 (prostatic carcinoma, prostatic cancer, PCa) 是男性生殖系最常見的惡性腫瘤,,發(fā)病隨年齡而增長(zhǎng),,其發(fā)病率有明顯的地區(qū)差異,,歐美地區(qū)較高。據(jù)報(bào)道僅次于肺癌,,在男性是癌癥死亡的第二位。前列腺癌常見的診斷方式包括,,酸性磷酸酶的放射免疫測(cè)定,前列腺液的乳酸脫氫酶的測(cè)定,,經(jīng)直腸的超聲顯像,CT檢查以及前列腺穿刺針改進(jìn)等,,前列腺癌的病理檢出率和經(jīng)驗(yàn)臨床上的發(fā)病率有很大差異,。
早期檢測(cè)前列腺癌就像大海撈針一樣困難,,因?yàn)樗鼘?shí)在是太難被發(fā)現(xiàn)了,患者唯一能夠求助的診斷方法是活檢,,但這種方法通常只能捕捉到10%的癌癥。而且目前沒有一種放射學(xué)方法能夠明確地定位癌性腫瘤究竟存在于前列腺的什么地方,?
為了解決這個(gè)問題,哈佛大學(xué)醫(yī)學(xué)院的科學(xué)家們使用尖端的成像技術(shù)繪制了首張精細(xì)的前列腺癌代謝產(chǎn)物化學(xué)圖譜(三維彩色圖譜),。這種方法可用于檢測(cè)處于早期階段的前列腺癌,。
在本研究中,,Chin-Lee Wu及其同事對(duì)人類前列腺的代謝物分布進(jìn)行了觀察。代謝物是身體中由化學(xué)反應(yīng)所產(chǎn)生的小分子物質(zhì),。這些隱藏在細(xì)胞漿中的“化學(xué)性指紋”,,通過代謝產(chǎn)物進(jìn)行溯源分析進(jìn)而分析前列腺癌的具體情況。但是這些化學(xué)小分子是如此地細(xì)小,,通常找到它們無(wú)法用常規(guī)的儀器來(lái)進(jìn)行。于是科學(xué)家們使用尖端的成像技術(shù)開始了這一嘗試,,這一新的方法通過其化學(xué)組成的鏡頭來(lái)觀察癌癥,或?yàn)榕R床精確檢測(cè)前列腺癌鋪平道路,。
研究人員發(fā)現(xiàn),某些代謝物比其它的代謝物對(duì)癌癥更為敏感,,而代謝物的特異性結(jié)合可用于顯示前列腺中的“熱點(diǎn)”或是具有高機(jī)率癌變的地區(qū),。通過測(cè)量前列腺組織中不同量的各種化學(xué)物質(zhì)或代謝物,,并用該數(shù)據(jù)來(lái)創(chuàng)建一個(gè)由電腦所產(chǎn)生的組織特異圖,,研究者發(fā)現(xiàn),他們能夠以93-97%的總體精確度探查到前列腺癌灶的存在,。這些結(jié)果提示,對(duì)組織中的全部的代謝變化進(jìn)行集體評(píng)估可被用來(lái)了解每位患者癌癥的獨(dú)有的特征,。(生物谷Bioon.com)
生物谷推薦原始出處:
Sci Transl Med 27 January 2010: DOI: 10.1126/scitranslmed.3000513
Metabolomic Imaging for Human Prostate Cancer Detection
Chin-Lee Wu1,2,*, Kate W. Jordan1,*, Eva M. Ratai3, Jinhua Sheng4, Christen B. Adkins1, Elita M. DeFeo1, Bruce G. Jenkins3, Leslie Ying4, W. Scott McDougal2 and Leo L. Cheng1,3,?
1Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA.
2Department of Urology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA.
3Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA.
4Department of Electrical Engineering and Computer Science, University of Wisconsin, Milwaukee, WI 53201, USA.
As current radiological approaches cannot accurately localize prostate cancer in vivo, biopsies are conducted at random within prostates for patients at risk for prostate cancer, leading to high false-negative rates. Metabolomic imaging can map cancer-specific biomolecular profile values onto anatomical structures to direct biopsy. In this preliminary study, we evaluated five whole prostates removed during prostatectomy from biopsy-proven cancer patients on a 7-tesla human whole-body magnetic resonance scanner. Localized, multi–cross-sectional, multivoxel magnetic resonance spectra were used to construct a malignancy index based on prostate cancer metabolomic profiles obtained from previous intact tissue analyses with a 14-tesla spectrometer. This calculated malignancy index is linearly correlated with lesion size and demonstrates a 93 to 97% overall accuracy for detecting the presence of prostate cancer lesions, suggesting the potential clinical utility of this approach.