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Method and probe set for detecting cancer

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Method and probe set for detecting cancer


Methods for detecting cancer that include hybridizing a set of chromosomal probes to a biological sample obtained from a patient, and identifying if aneusomic cells are present in a selected subset of cells obtained from the biological sample are described. A set of chromosomal probes and kits for detecting cancer that include sets of chromosomal probes, are also described.

Inventors: Kevin C. Halling, Robert B. Jenkins, Walter King, Irina A. Sokolova, Steven A. Seelig
USPTO Applicaton #: #20120276540 - Class: 435 611 (USPTO) - 11/01/12 - Class 435 


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The Patent Description & Claims data below is from USPTO Patent Application 20120276540, Method and probe set for detecting cancer.

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CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No. 13/076,828, filed Mar. 31, 2011, which is a continuation of U.S. application Ser. No. 11/751,429, filed May 21, 2007, which is a continuation of U.S. application Ser. No. 10/121,483, filed Apr. 12, 2002, now U.S. Pat. No. 7,232,655, which is a continuation of U.S. application Ser. No. 09/621,173, filed Jul. 21, 2000, now U.S. Pat. No. 6,376,188, which is a continuation of U.S. application Ser. No. 09/264,149, filed Mar. 5, 1999, now U.S. Pat. No. 6,174,681. The disclosures of the prior applications are considered part of (and are incorporated by reference in) the disclosure of this application.

TECHNICAL FIELD

The invention relates to detecting cancer.

BACKGROUND OF THE INVENTION

Bladder cancer represents the fifth most common neoplasm and the twelfth leading cause of cancer death in the United States, where over 53,000 new cases are diagnosed each year. Over 95% of bladder cancer cases in the United States are transitional cell carcinoma (TCC, sometimes referred to as urothelial cell carcinoma). Tumor state is the best predictor of prognosis for patients with bladder cancer. Bladder cancer is staged according to the depth of invasion of the tumor and whether or not there are lymph node or distant metastases. Non-invasive papillary tumors (the most common and least aggressive type of bladder tumor) are referred to as stage pTa tumors. “Flat” TCC, more commonly referred to as “carcinoma in situ” (CIS) is a more aggressive but less common tumor that is associated with a high rate of progression to invasive disease. CIS is assigned a stage of pTIS. Tumors that have invaded through the basement membrane of the epithelium into the underlying lamina propria are assigned a stage of pT1. A tumor that has invaded the muscle of the bladder is a stage pT2 tumor. Invasion through the muscle into the tissue surrounding the bladder is a pT3 tumor. Invasion into surrounding organs is a pT4 tumor. The term “superficial” bladder cancer refers to pTa, pTIS, and pT1 tumors. Muscle-invasive bladder cancer refers to pT2, pT3 and pT4 tumors.

Approximately 80% of bladder cancer cases present as “superficial” bladder cancer and the remaining 20% as muscle-invasive bladder cancer. Patients with “superficial” bladder cancer do not require cystectomy (i.e. removal of the bladder) but have a high risk of tumor recurrence, and are monitored for tumor recurrence and/progression on a regular basis (usually every 3 months for the first 2 years, every 6 months for the next 2 years, and every year thereafter). Treatment for superficial bladder cancer generally consists of surgical removal of papillary tumors and treatment of CIS with Bacillus-Calmette Guerin (BCG). Patients with muscle invasive disease are treated by cystectomy and have a relatively poor prognosis compared to patients with “superficial” bladder cancer. Unfortunately, 80-90% of patients with muscle invasive bladder cancer initially present with muscle invasive disease. A large share of the estimated 10,000 deaths per year from bladder cancer is accounted for by this group of patients. The fact that many patients with advanced bladder cancer present that way suggests that screening programs that detect bladder cancer at earlier stages may help reduce the overall mortality from the disease. In fact, at least two large screening studies suggest that screening does help identify bladder cancer at earlier stages. Messing et al., Urology,45:387-396, 1995; and Mayfield and Whelan, Br. J. Urol., 82(6):825-828, 1998.

Cystoscopy and urine cytology have been the mainstays for bladder cancer detection over the past several decades. Several studies, however, have shown that cytology has a disappointingly low sensitivity for bladder cancer detection. Mao et al., Science, 271:659-662, 1996; Ellis et al., Urology, 50:882-887, 1997; and Landman et al., Urology, 52:398-402, 1998. For this reason, there has been great interest in the development of new assays that have increased sensitivity for the detection of bladder cancer. Examples of new assays that have been developed for bladder cancer detection include tests that detect bladder tumor antigens, e.g. BT test (C.R. Bard, Inc., Murrayhill, N.J.), NMP-22, FDP, etc., tests that detect increased telomerase activity (usually associated with malignancy), or tests that detect genetic alterations in urinary cells and bladder washings (e.g. fluorescence in situ hybridization (FISH) and microsatellite analysis). Although FISH analysis may be more sensitive than other detection methods, large numbers of cells must be counted, and consequently, the analysis is time consuming and costly. Therefore, a need exists for a rapid method of detecting cancer that maintains adequate sensitivity.

SUMMARY

OF THE INVENTION

The invention is based, in part, on the discovery that a rapid, sensitive method for detecting cancer can be based on the presence of aneusomic cells in a selected subset of cells from a biological sample. Selection of a subset of cells to be evaluated for chromosomal anomalies reduces the number of cells to be analyzed, allowing analysis to be performed in a rapid manner while maintaining, and even improving, sensitivity. The invention also provides a set of chromosomal probes selected to provide the optimal sensitivity in FISH analysis and kits for detecting cancer that include sets of chromosomal probes.

In one aspect, the invention features a method of screening for cancer in a subject. The method includes the steps of hybridizing a set of chromosomal probes to a biological sample from the subject; selecting cells from the biological sample; determining the presence or absence of aneusomic cells in the selected cells; and correlating the presence of aneusomic cells in the selected cells with cancer in the subject. The biological sample can be urine, blood, cerebrospinal fluid, pleural fluid, sputum, peritoneal fluid, bladder washings, oral washings, tissue samples, touch preps, or fine-needle aspirates, and can be concentrated prior to use. Urine is a particularly useful biological sample. The cells can be selected by nuclear morphology including nucleus size and shape. Nuclear morphology can be assessed by DAPI staining. The method is useful for detecting cancers such as bladder cancer, lung cancer, breast cancer, ovarian cancer, prostate cancer, colorectal cancer, renal cancer, and leukemia. The method is particularly suited for detecting bladder cancer.

The set of chromosomal probes includes at least three chromosomal probes. The set can include at least one centromeric probe or at least one locus specific probe. Suitable centromeric chromosomal probes include probes to chromosomes 3, 7, 8, 11, 15, 17, 18, and Y. A suitable locus specific probe includes a probe to the 9p21 region of chromosome 9. For example, the set can include centromeric chromosomal probes 3, 7, and 17, and further can include locus specific probe 9p21. The chromosomal probes can be fluorescently labeled.

The invention also features sets of chromosomal probes and kits for detecting cancer that include sets of chromosomal probes, that include centromeric probes to chromosomes 3, 7, and 17, and further can include a locus-specific probe such as 9p21. The chromosomal probes can be fluorescently labeled.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although methods and materials similar or equivalent to those described herein can be used to practice the invention, suitable methods and materials are described below. All publications, patent applications, patents, and other references mentioned herein are incorporated by reference in their entirety. In case of conflict, the present specification, including definitions, will control. In addition, the materials, methods, and examples are illustrative only and not intended to be limiting.

Other features and advantages of the invention will be apparent from the following detailed description, and from the claims.

DETAILED DESCRIPTION

The invention advantageously provides a rapid, sensitive method for detecting cancer, and can be used to screen subjects at risk for cancer, including solid tumors and leukemias, or to monitor patients diagnosed with cancer for tumor recurrence. For example, subjects at risk for bladder cancer, lung cancer, breast cancer, ovarian cancer, prostate cancer, colorectal cancer, head and neck cancer, renal cancer, or leukemia can be screened or monitored for recurrence. In general, a set of chromosomal probes is hybridized to cells (from urine or other biological sample) on a slide. The cells on the slide are then visually scanned at a relatively low power (e.g. 200-400) for morphologic features strongly suggestive of malignancy (e.g. increased nuclear size or irregular nuclear shape). The nuclei of the cytologically abnormal cells are then examined for chromosomal abnormalities by switching the objective to a higher power (e.g. 600-1000×) and “flipping” the filters to determine if the cell is aneusomic or not. Use of this process markedly reduces the time spent assessing cells that have a low probability of being neoplastic and allows the examiner to focus their efforts on the cells that have a much higher probability of being neoplastic and showing aneusomy.

In Situ Hybridization

The presence or absence of aneusomic cells is determined by in situ hybridization. “Aneusomic cells” are cells having an abnormal number of chromosomes or having chromosomal structural alterations such as hemizygous or homozygous loss of a specific chromosomal region. Typically, aneusomic cells having one or more chromosomal gains, i.e., three or more copies of any given chromosome, are considered test positive in the methods described herein, although cells exhibiting monosomy and nullisomy also may be considered test positive under certain circumstances. In general, in situ hybridization includes the steps of fixing a biological sample, hybridizing a chromosomal probe to target DNA contained within the fixed biological sample, washing to remove non-specific binding, and detecting the hybridized probe.

A “biological sample” is a sample that contains cells or cellular material. Typically, the biological sample is concentrated prior to hybridization to increase cell density. Non-limiting examples of biological samples include urine, blood, cerebrospinal fluid (CSF), pleural fluid, sputum, and peritoneal fluid, bladder washings, secretions (e.g. breast secretion), oral washings, tissue samples, touch preps, or fine-needle aspirates. The type of biological sample that is used in the methods described herein depends on the type of cancer one wishes to detect. For example, urine and bladder washings provide useful biological samples for the detection of bladder cancer and to a lesser extent prostate or kidney cancer. Pleural fluid is useful for detecting lung cancer, mesothelioma or metastatic tumors (e.g. breast cancer), and blood is a useful biological sample for detecting leukemia. For tissue samples, the tissue can be fixed and placed in paraffin for sectioning, or frozen and cut into thin sections.

Typically, cells are harvested from a biological sample using standard techniques. For example, cells can be harvested by centrifuging a biological sample such as urine, and resuspending the pelleted cells. Typically, the cells are resuspended in phosphate-buffered saline (PBS). After centrifuging the cell suspension to obtain a cell pellet, the cells can be fixed, for example, in acid alcohol solutions, acid acetone solutions, or aldehydes such as formaldehyde, paraformaldehyde, and glutaraldehyde. For example, a fixative containing methanol and glacial acetic acid in a 3:1 ratio, respectively, can be used as a fixative. A neutral buffered formalin solution also can be used, and includes approximately 1% to 10% of 37-40% formaldehyde in an aqueous solution of sodium phosphate. Slides containing the cells can be prepared by removing a majority of the fixative, leaving the concentrated cells suspended in only a portion of the solution.

The cell suspension is applied to slides such that the cells do not overlap on the slide. Cell density can be measured by a light or phase contrast microscope. For example, cells harvested from a 20 to 100 ml urine sample typically are resuspended in a final volume of about 100 to 200 μl of fixative. Three volumes of this suspension (usually 3, 10, and 30 μl), are then dropped into 6 mm wells of a slide. The cellularity (i.e. density of cells) in these wells is then assessed with a phase contrast microscope. If the well containing the greatest volume of cell suspension does not have enough cells, the cell suspension is concentrated and placed in another well.

Prior to in situ hybridization, chromosomal probes and chromosomal DNA contained within the cell each are denatured. Denaturation typically is performed by incubating in the presence of high pH, heat (e.g., temperatures from about 70° C. to about 95° C.), organic solvents such as formamide and tetraalkylammonium halides, or combinations thereof. For example, chromosomal DNA can be denatured by a combination of temperatures above 70° C. (e.g., about 73° C.) and a denaturation buffer containing 70% formamide and 2×SSC (0.3M sodium chloride and 0.03 M sodium citrate). Denaturation conditions typically are established such that cell morphology is preserved. Chromosomal probes can be denatured by heat. For example, probes can be heated to about 73° C. for about five minutes.

After removal of denaturing chemicals or conditions, probes are annealed to the chromosomal DNA under hybridizing conditions. “Hybridizing conditions” are conditions that facilitate annealing between a probe and target chromosomal DNA. Hybridization conditions vary, depending on the concentrations, base compositions, complexities, and lengths of the probes, as well as salt concentrations, temperatures, and length of incubation. The higher the concentration of probe, the higher the probability of forming a hybrid. For example, in situ hybridizations are typically performed in hybridization buffer containing 1-2×SSC, 50% formamide and blocking DNA to suppress non-specific hybridization. In general, hybridization conditions, as described above, include temperatures of about 25° C. to about 55° C., and incubation lengths of about 0.5 hours to about 96 hours. More particularly, hybridization can be performed at about 32° C. to about 40° C. for about 2 to about 16 hours.



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stats Patent Info
Application #
US 20120276540 A1
Publish Date
11/01/2012
Document #
13540260
File Date
07/02/2012
USPTO Class
435/611
Other USPTO Classes
International Class
12Q1/68
Drawings
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