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The levels of blood urea nitrogen (BUN) and creat<strong>in</strong><strong>in</strong>e levels <strong>in</strong> blood is<br />

related with the kidney function. The <strong>in</strong>creased levels of them mean that kidney<br />

function is impaired. Similarly, low levels of Album<strong>in</strong> and high levels of Calcium <strong>in</strong><br />

the blood can be a cue of advanced <strong>myeloma</strong> (Bataille et al., 1992; Jacobson et al.,<br />

2003).<br />

Bone marrow biopsy is of great importance <strong>in</strong> terms of check<strong>in</strong>g the bone<br />

marrow. Because, <strong>in</strong> MM, patients have too many plasma cells <strong>in</strong> their bone marrow<br />

(Smith et al., 2006).<br />

With the progression of technology <strong>in</strong> imag<strong>in</strong>g area, these types of studies beg<strong>in</strong><br />

to occupy a great place. One of these types of study is Bone x-rays. By the help of<br />

method, bone destruction caused by the <strong>myeloma</strong> cells can be detected (Ozaki, 2007).<br />

The computed tomography (CT or CAT) scan can be used as an improved x-ray<br />

procedure to take the detailed cross-sectional images of patient’s body to determ<strong>in</strong>e the<br />

damaged bones (Schreiman et al., 1985; Kyle et al., 1985; W<strong>in</strong>terbottom and Shaw,<br />

2009). One another imag<strong>in</strong>g methos is magnetic resonance (MRI). It can be also useful<br />

<strong>in</strong> look<strong>in</strong>g at bones. It differs from the x-rays and CT <strong>in</strong> that it utilizes radio waves<br />

<strong>in</strong>stead of x-rays. Firstly, this energy is absorbed and then released <strong>in</strong> a pattern<br />

produced by the type of tissue. Next, the pattern of radio waves given off by the tissues<br />

are translated <strong>in</strong>to detailed image of the body (Joffe et al., 1988; Lecouvet et al., 2001).<br />

To make a diagnosis of MM, results obta<strong>in</strong>ed any s<strong>in</strong>gle test are not sufficient.<br />

1.2.6. Stages of MM<br />

Stag<strong>in</strong>g process is very significant <strong>in</strong> that it is the sign of cancer progress.<br />

Importance of this process stems from determ<strong>in</strong><strong>in</strong>g the appropriate treatment options<br />

and prognosis.<br />

MM has been staged with two systems up to now. One of them is Durie-Salmon<br />

Stag<strong>in</strong>g System and the other one is International Stag<strong>in</strong>g System. Although some<br />

doctors still use this system, its value is becom<strong>in</strong>g restricted due to newer diagnostic<br />

methods. Recently, International Stag<strong>in</strong>g System for MM has been developed.<br />

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