A 45-year-old man complains of burning epigastric pain that wakes him up at night. The pain is relieved by eating or using over-thecounter antacids and H2 blockers. Diagnosis is best confirmed by which of the following?
Question 1A 48-year-old woman has a malignant lymphoma involving lymph nodes in the para-aortic region. She istreated with a chemotherapeutic agent which results in the loss of individual neoplastic cells throughfragmentation of individual cell nuclei and cytoplasm. Over the next 2 months, the lymphoma decreasesin size, as documented on abdominal CT scans. By which of the following mechanisms has her neoplasmprimarily responded to therapy?