Doc made a shocking revelation about Felicity Huffman's character, Joan, dealing with a secret cancer battle. During the Tuesday, October 7, episode of the hit Fox series, Joan adjusted to a leadership position at Westside Hospital, which meant butting heads with colleagues such as Amy (Molly Parker). Viewers, however, were offered more insight into Joan's state of mind when a flashback showed a conversation between her and Amy. Joan told Amy she was diagnosed with myelodysplastic syndrome, meaning "there is a good chance it will turn into leukemia.