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Moreover , elevated levels of pyridoxal kinase ( PDXK ) , the enzyme that converts pyridoxine and other vitamin B6 precursors into PLP , have been shown to constitute a good , therapy - independent prognostic marker in patients affected by non - small cell lung carcinoma ( NSCLC ) .
 pyridoxal, pyridoxine, vitamin B6, PLP
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 pyridoxal, pyridoxine, vitamin B6, PLP