(CNN) - Former President Joe Biden said he will not be able to promote his new memoir as much as he would like because of his continued battle with cancer.

The book, titled “Promise Me America,” is due out Nov. 17.

Biden said in a social media post that some days are better than others, but that the disease has not stopped him. He said he is hopeful the words in his book will speak for themselves.

Biden was diagnosed with an aggressive form of prostate cancer last year. His son, Hunter Biden, said the cancer had metastasized into his father’s bones and further, and that it is difficult to watch.

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