1) About 2) Anent 3) As for 4) Between 5) Connecting 6) Inre 7) Inreferenceto 8) Inregardto 9) Re 10) Regarding 11) Related to 1) About 2) As regards 3) In relation to 4) On the subject of 5) On the topic of 6) Regarding 7) Relating to 8) With reference to 9) With regard to involving you 
• (a.) Important. • (n.) That in which one is concerned or interested; concern; affair; interest. • (p. pr. & vb. n.) of Concern • (prep.) Pertaining to; regarding; having relation to; respecting; as regards. • (n.) Emotion of mind; solicitude; anxiety. • (n.) Concern; participation; interposition. • (n.) Importan...
Con·cern'ing preposition Pertaining to; regarding; having relation to; respecting; as regards. « I have accepted thee concerning this thing. Gen. xix. 21. » « The Lord hath spoken good concerning Israel. Num. x. 29. » Con·cern'ing adjective Important. [ Archaic] « So great and so concerning truth. South. » 
concerning To do with or involving something or someone.
relating to; regarding; about: a discussion concerning foreign aid.