USE OF FREE CIRCULATING DNA FOR DIAGNOSIS, PROGNOSIS, AND TREATMENT OF CANCER FUNDING
A method of detecting circulating DNA in a body fluid. The method comprises identifying a subject suffering from or at risk for developing cancer, obtaining a body fluid sample from the subject, and determining the sequence integrity of circulating DNA in the sample, wherein the circulating DNA is not purified from the sample.
1 . A method of detecting circulating DNA in a body fluid, comprising:
identifying a subject suffering from or at risk for developing cancer;
obtaining a body fluid sample from the subject; and
determining the sequence integrity of circulating DNA in the sample, wherein the circulating DNA is not purified from the sample.
2 . The method of claim 1 , wherein the body fluid is serum or plasma.
3 . The method of claim 1 , wherein the circulating DNA includes a repetitive DNA marker sequence indicative of the sequence integrity of the circulating DNA.
4 . The method of claim 3 , wherein the circulating DNA includes a short interspersed nuclear element (SINE), a long interspersed nuclear element (LINE), or both.
5 . The method of claim 1 , wherein the sequence integrity of the circulating DNA is determined by quantitative real-time polymerase chain reaction (qPCR).
6 . The method of claim 1 , wherein the cancer is breast cancer, colorectal cancer, periampullary cancer, melanoma, or prostate cancer.
7 . The method of claim 1 , wherein the sequence integrity of the circulating DNA is indicated by the total amount of the circulating DNA, the amount of the circulating DNA released from cancer cells, the ratio of the amount of the circulating DNA released from the cancer cells to the total amount of the circulating DNA, or a combination thereof.
8 . The method of claim 7 , wherein the total amount of the circulating DNA is indicated by the amount of ALU115, the amount of the circulating DNA released from the cancer cells is indicated by the amount of ALU247 or LINE1 297, and the ratio of the amount of the circulating DNA released from the cancer cells to the total amount of the circulating DNA is indicated by the ratio of the amount of ALU247 to the amount of ALU115.
9 . A method of detecting circulating DNA in a body fluid, comprising:
obtaining circulating DNA from a body fluid sample; and
detecting a combination of the sequence integrity and the methylation integrity of the circulating DNA in the sample.
10 . The method of claim 9 , wherein the body fluid sample is from a subject identified to be suffering from or at risk for developing cancer.
11 . The method of claim 10 , wherein the cancer is breast cancer, colorectal cancer, periampullary cancer, melanoma, or prostate cancer.
12 . The method of claim 9 , wherein the circulating DNA includes a LINE sequence.
13 . The method of claim 12 , wherein the circulating DNA includes LINE1 297.
14 . The method of claim 9 , wherein the methylation integrity of the circulating DNA is indicated by the unmethylated status of the circulating DNA.
15 . The method of claim 14 , wherein the unmethylated status of the circulating DNA is indicated by the unmethylated status of a LINE1 sequence.
16 . The method of claim 9 , wherein the body fluid is serum or plasma.
17 . The method of claim 9 , wherein the sequence integrity of the circulating DNA is detected by qPCR.
18 . The method of claim 9 , wherein the methylation integrity of the circulating DNA is detected by quantitative analysis of methylated alleles (QAMA).
19 . A method for diagnosis, prognosis, and treatment of cancer, comprising:
obtaining circulating DNA from a body fluid sample;
detecting the methylation integrity of the circulating DNA in the sample using a LINE sequence as a marker; and
applying the methylation integrity of the circulating DNA in diagnosis, prognosis, and treatment of cancer.
20 . The method of claim 19 , wherein the LINE sequence is LINE1.