ALCAM and meningioma: The latter genes are ALCAM, NRP1, IGF1R, CA1, and ERCC4. Of these, NRP1 and IGF1R do not have a clearly related role in meningioma yet, but evidence points toward the implication of the former in meningioma-associated neoangiogenesis (49) and for the blocking of the latter as therapeutic option (50).