RE, what does it stand for in this context?

choose   Mon Mar 30, 2009 12:08 pm GMT
What does 'RE' in 'RE: Release of medical records for' stand for here? Obviously, not 'reply' since the sender is initiating the conversation.

[Your Name]
[Street Address]
[City, ST ZIP Code]
March 30, 2009
[Doctor Name]
[Medical Practice or Hospital Name]
[Street Address]
[City, ST ZIP Code]

RE: Release of medical records for [Your Name], DOB: [your date of birth], SSN: [Social Security Number]
Dear [Doctor Name]:
Please release my medical records related to treatment for [medical condition(s)] rendered by you or under your supervision from [date] through [date]. This information will be used to further assist in my medical care, and should be mailed to:
[Your Name or Name of Party to Receive Records]
[Street Address]
[City, ST ZIP Code]

Please bill me for costs associated with providing copies of my records, and I will remit payment promptly upon receipt of the records.
Sincerely,
[Your Name]
cc:
cc   Mon Mar 30, 2009 3:03 pm GMT
"regarding", or "in reference to", etc.