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The atypia of the lining cells extended beyond the tumor front , showing a sharp demarcation with normal type I pneumocytes ( Figure 2 ( a ) ) , a feature characteristic to nonmucinous adenocarcinoma in situ with lepidic growth pattern ( former bronchioloalveolar carcinoma , BAC ) [ 3 ] .
 lining cells, tumor front, type I pneumocytes, nonmucinous adenocarcinoma in situ, bronchioloalveolar carcinoma, BAC
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 lining cells, tumor front, type I pneumocytes, nonmucinous adenocarcinoma in situ, bronchioloalveolar carcinoma, BAC