<P> With the passing of Doug's father comes the re-entrance of Mark's parents . He and Doug travel to California to settle Doug's father's affairs (Doug's father and new wife were both killed in a car wreck) and take a side trip to visit Mark's parents, who live in another part of California . His relationship with his father David is still strained, and his mother suffers from a string of medical conditions associated with aging . Mark also finds out that his mother viewed his birth as a mistake, as she didn't know his father well and got married quickly when she got pregnant . Mark's distrust of the Navy puts him at odds with David when he and Mark fight over whether Ruth should be treated in a base hospital or a civilian hospital . Ruth eventually dies and Mark goes to her funeral, leaving him on edge when he clashes with Kerry Weaver over Robert Romano's successful drive for the chief of staff position . </P> <P> Mark's personal life after his marriage is tumultuous . He takes after Doug, having several flings and an affair with Nurse Chuny Marquez, and setting up three dates in one day . He has a brief relationship with a needy desk clerk, Cynthia Hooper (played by Mariska Hargitay in season 4). Hooper leaves him after she finds out Mark doesn't really love her . Mark eventually meets a British surgeon, Elizabeth Corday . Corday is in Chicago on an exchange program, under the guidance of Dr. Romano . Romano's advances on Corday fail, as does her relationship with Peter Benton . Eventually, Mark and Elizabeth begin dating in Season 5, finally forming a stable and happy relationship . During Season 6, Mark discovers that his father is suffering from advanced lung cancer . After David loses his wife and develops end stage lung cancer, he realises that he can no longer live alone, and he moves to Chicago and stays with Mark; after an awkward first meeting, he warms up to Elizabeth very quickly . After an emotional bonding that heals their difficult relationship from Mark's youth, David dies . </P> <P> Mark and Elizabeth begin a more serious relationship and move in together . Mark later buys a house, and he and Elizabeth get married and have a daughter, Ella . Their happiness is threatened, though, when the abusive father of a patient goes on a killing rampage after losing his son to social workers . In a bid to get his son back, he kills and injures a number of people and attempts to go after Elizabeth and Ella . After being shot by an armed bystander, he is brought to the ER . During his treatment, Mark takes him aboard an elevator to go to an operating room . The patient goes into arrest when alone in the elevator with Mark, who withholds defibrillation and allows him to go into vfib and die . He later falsifies records to show that he did attempt to save the patient . Elizabeth suspects what Mark did but lets the matter drop . Later, Rachel appears in Chicago unannounced, citing arguments with her mother, and moves in with Mark and a very reluctant Elizabeth . She sneaks out of the house at night and uses drugs, which clouds her relationship with Elizabeth . </P> <P> While suturing a patient's wound, Mark loses control of his faculties and is temporarily unable to speak . After a CT scan and a biopsy, he is diagnosed with an aggressive form of brain cancer, glioblastoma multiforme, that is thought to be inoperable . Embarrassed, Greene briefly tries to hide his condition, but his cover is blown when he has a seizure while arguing with Carter . With little time, Mark seeks a second opinion from an eminent New York City neurosurgeon, Dr. Burke . Mark is told that the tumor is near a critical section of his brain but hasn't "invaded" it yet and they can perform an operation on New Year's Eve 2000 . Mark's surgery is performed by Burke and things appear to be positive, although it takes him a while to return to his old self . A year or so later, however, Mark finds out his tumor has returned, and Dr. Burke both confirms this and says he cannot operate again because the tumor regrowth is now in part of his brain where an operation would render Mark completely vegetative . While chemo treatment will only allow Mark to live for another 5--6 months, Burke points out: "You should have been dead a year ago, Mark . You got married, saw your daughter be born - I'd say that was time well spent ." </P>

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