GC: adj

S: ELSEVIER – http://www.journals.elsevier.com/journal-of-oncological-science/ (last access: 21 September 2016); Hindawi – https://www.hindawi.com/journals/crionm/ (last access: 21 September 2016).

N: 1. oncology (1857, coined in English from onco- “tumor” + -logy “science or study of.” Related: Oncologist; oncological) +‎ -ical (combination of -ic from French -ique, from Latin -icus, related to Ancient Greek suffix -ικός ‎(-ikós), plus -al from Latin adjective suffix -alis, or French -el).
2. Pertaining to oncology.

S: 1 & 2. Wiktionary – https://en.wiktionary.org/wiki/oncological (last access: 21 September 2016); OED – http://www.etymonline.com/index.php?allowed_in_frame=0&search=oncological (last access: 21 September 2016).

SYN: oncologic

S: GDT – http://www.granddictionnaire.com/ficheOqlf.aspx?Id_Fiche=8372624 (last access: 21 September 2016)

CR: cancer, cancerology, cancerous, carcinogenic, cyst, neoplasia, neoplastic.