St. Louis Cardinals legend Lou Brock is undergoing treatment for a type of cancer that affects the blood and bones, the team said Thursday.

In a press release, the St. Louis Cardinals said Brock has been undergoing treatment for multiple myeloma. Multiple myeloma is a cancer formed by malignant plasma cells, and can affect blood levels, cause bone and calcium problems and affect the immune system, according to the American Cancer Center.

"Jackie and I appreciate the prayers and support we have received from our many friends and fans in the Cardinals community," Brock said in the release. "We count ourselves blessed that I am receiving the best possible medical treatment and we look forward to seeing many more Cardinals World Series Championships in the future." 

Last year, Brock overcame complications from diabetes–which resulted in a long hospital stay and amputation of his left leg below the knee.

“As you prepare to get on the highway, the path to wellness and to healing–you don’t expect all this to happen,” shared Brock last April, after he threw out the first pitch to help celebrate his recovery.

“Once you find out you can do it, you have the challenge to do it and the old juices from the past start to rise up in you and you think, ‘I can do this’,” he continued.

“When you look at the people that got involved, began to give you their support, lend their support, offer their support–it was just overwhelming as a person to stand there and take that and be able to move somewhat accordingly, in spite of the injury.”

This year, the 77-year old Brock was unable to attend the Opening Day festivities for the Cardinals.

The release said Brock will miss an event at Busch Stadium on April 25.

Photos: Cardinals great Lou Brock

Brian Stull of contributed to this story.

Prayers for Brock - STL Baseball Weekly

The St. Louis Cardinals announced this afternoon that Lou Brock has cancelled his upcoming appearance on April 25th for the Budweiser Bash at Busch Stadium. The Hall of Famer was recently diagnosed with Multiple Myeloma and is currently receiving treatment for the bone cancer.