The Collaborative International Dictionary of English v.0.48:

carcinogenic \car`cin*o*gen"ic\
   (k[aum]r`s[i^]n*[-o]*j[e^]n"[i^]k), adj.
   Causing or tending to cause cancer; as, the carcinogenic
   action of certain chemicals or of ionizing radiation. --
   car`cin*o*gen*ic"i*ty, n.
   [WordNet 1.5 +PJC]

Moby Thesaurus II by Grady Ward, 1.0:

41 Moby Thesaurus words for "carcinogenic":
   allergic, anemic, apoplectic, arthritic, bilious, cancerous,
   chlorotic, colicky, consumptive, dropsical, dyspeptic, edematous,
   encephalitic, epileptic, laryngitic, leprous, luetic, malarial,
   malignant, measly, nephritic, neuralgic, neuritic, palsied,
   paralytic, phthisic, pleuritic, pneumonic, pocky, podagric,
   rachitic, rheumatic, rickety, scorbutic, scrofulous, tabetic,
   tabid, tubercular, tuberculous, tumorigenic, tumorous