nonneoplastic

The story

1. Proto-Indo-European*né
2. Proto-Germanic*ne
3. Proto-Indo-European*ís?
4. Proto-Indo-European*h₁óynos
5. Proto-Germanic*ainaz
6. Proto-Germanic*nainaz
7. Proto-West Germanic*nain
8. Old Englishnān
9. Middle Englishnon
10. Old Englishnān
11. Old Englishnān-
12. Middle Englishnon-
13. Englishnon-
14. Proto-Indo-European*nu
15. Proto-Indo-European*néwos
16. Proto-Hellenic*néwos
17. Ancient Greekνέος (néos)
18. Ancient Greekνεο- (neo-)
19. Englishneo-
20. Proto-Hellenic*plátʰyō
21. Proto-Hellenic*plát͏̌t͏̌ō?
22. Ancient Greekπλάσσω (plássō)
23. Ancient Greekπλᾰστῐκός (plăstĭkós)
24. Latinplasticus
25. Englishplastic
26. Englishneoplastic
27. English todaynonneoplastic

From non- + neoplastic.