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Review Question - QID 210639

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QID 210639 (Type "210639" in App Search)
A 62-year-old woman presents to her physician because she has been feeling increasingly fatigued over the last several months. In addition, she says that she has woken up at night several times and found herself completely covered in sweat. Finally, she says that she has lost 20 pounds despite no changes in her daily routine. On presentation, her temperature is 101.0°F (38.3°C), blood pressure is 134/83 mmHg, pulse is 71/min, and respirations are 19/min. Physical exam reveals a number of enlarged lymph nodes. Based on these findings, she is given a lab test revealing an abnormally high concentration of a protein arranged in a pentameric complex on serum electrophoresis. Which of the following is most strongly associated with the cause of this patient's symptoms?