Various nodules can be detected in patients - not infrequently by chance. Particularly feared are those nodules that appear within the lungs - after all, they may even be cancerous. In differentiating benign from malignant lesions, invasive methods such as biopsy are usually used. Sometimes, however, it is common to adjudicate whether a biopsy is actually necessary - a marker test in the blood, which scientists from theMedical University of South Carolina in Charleston areworking on in the future, may make this decision easier .