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Receiver operating characteristic analysis showed that the serum CA 19 - 9 level had good predictive value for malignant or invasive IPMNs , postoperative survival , and disease - specific recurrence .
 serum, malignant, invasive IPMNs
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 serum, malignant, invasive IPMNs