The 83-year-old actor's agent Steve Kenis confirmed the news to the Associated Press after his son Tarek Sharif revealed the diagnosis in an interview with a Spanish newspaper on 23 May.
No details about his condition or care have been given.
Egyptian-born Sharif rose to international stardom with his role in the 1962 epic Lawrence Of Arabia - his first English-language film.
He earned an Oscar nomination for his turn as Sherif Ali in David Lean's iconic film opposite Peter O'Toole.
Sharif followed the breakthrough performance with the title role in Lean's Doctor Zhivago, co-starring Julie Christie.
He then played Fanny Brice's husband, Nicky Arnstein, in Funny Girl alongside Barbra Streisand.
His last completed feature film credits were in 2013.
The Shake It Off singer, who is among the most popular celebrities on Twitter with 58 million followers, is a new entry at 64 in the Forbes Power Women List.
At the age of 25, she is the youngest person on a list topped by Angela Merkel for the fifth time in a row.
Presidential candidate Hillary Clinton climbs from sixth to second in this year's list, while Melinda Gates, co-chairman of the Bill and Melinda Gates Foundation with her husband, remains in third.
Both have been on the list since it began in 2004, along with the Queen, who drops six places to 41 but retains her status as the oldest entry at 89-years-old.
The 19 newcomers also include Bank of England deputy governor Nemat Shafik (66) and the new Guardian editor-in-chief Katharine Viner (80).
They join Her Majesty as the UK's three representatives.
Facebook's second-in command Sheryl Sandberg, whose husband David Goldberg died in May while on holiday in Mexico, makes the list at number nine, one ahead of First Lady Michelle Obama.
One woman to fall off the list this year is pop singer Lady Gaga.
There are 15 billionaires, eight heads of state and 24 CEOs in the 100.
Combined, the women control nearly $1tn (£649bn) in annual revenues and have 474 million followers on Twitter and YouTube.
Forbes applies four metrics - money, media, impact and spheres of influence - in deciding who gets on the list.
The top 15 is:
1. Angela Merkel, German Chancellor
2. Hillary Clinton, US presidential candidate
3. Melinda Gates, co-chair of the Bill and Melinda Gates Foundation
4. Janet Yellen, US Federal Reserve Bank chair
5. Mary Barra, CEO, General Motors
6. Christine Lagarde, MD of International Monetary Fund
7. Dilma Rousseff, President of Brazil
8. Sheryl Sandberg, COO, Facebook
9. Susan Wojcicki, CEO, YouTube
10. Michelle Obama, US First Lady
11. Park Geun-hye, President of South Korea
12. Oprah Winfrey, media mogul
13. Virginia Rometty CEO, IBM
14. Meg Whitman, CEO, HP
15. Indra Nooyi CEO, PepsiCo
The New York-born star was known for her opposites-attract comedy routine with husband Jerry Stiller.
Her family said she died at the weekend but no details about the circumstances were given.
A statement said: "She is survived by her husband and partner in life Jerry Stiller. The two were married for 61 years and worked together almost as long."
In a tweet on Monday, Ben Stiller wrote: "Thank you so much for all the kind words about Anne. All of us in our family feel so lucky to have had her in our lives."
Meara and Stiller, who met in 1953 at an agent's office and married a few months later, worked together in the Compass Players comedy troupe, a precursor to the Second City organisation, before forming their own duo.
By the 1960s, they had become a popular comedy duo on American television, making 36 appearances on The Ed Sullivan Show.
Their act included skits such as an interview with the biblical Jonah after his encounter with the whale and parodies of TV commercials.
Much of their humour was marriage-based and focused on height - Stiller was 5ft 4 (1.62m), Meara was taller - and ethnicity - he was Jewish, she was of Irish heritage.
"Our marriage has lasted because we have the same feelings of insecurity about being an actor. We needed stability," Stiller told the New York Daily News in 2012.
In the early 1970s, the pair began working separately.
She made the movies The Out-Of-Towners and Lovers And Other Strangers and had a one-year run starring on the television show Kate McShane.
She also appeared on television shows The King Of Queens and Sex And The City.
She is also survived by daughter Amy, son Ben, and her grandchildren.
Cary Fukunaga, who won an Emmy for directing the first series of True Detective, reportedly left New Line Cinema's adaptation due to budget issues and an unfinished script.
King tweeted: "The remake of IT may be dead - or undead - but we'll always have Tim Curry. He's still floating down in the sewers of Derry."
Tim Curry played demonic clown Pennywise, who lives in a sewer system, in the TV miniseries made in 1990.
The film was due to begin shooting in three weeks.
British star Will Poulter, 22, was reported to be in line to play Pennywise.
It is thought Fukunaga fell out with the studios over his plans to remake It in two parts again and the rising costs.
It is not known if a new director will be signed up to take over the project.
The opposition stems from the title, Aloha, which some believe is a disrespectful misappropriation of culture and simplifies a word rich with meaning.
The critics, who include the state's film commissioner, are also disapproving of the fact that the film does not accurately reflect the diverse ethnicity of the island's residents.
In a press release issued to the New York Post, the Media Action Network for Asian Americans (MANAA) blasted the film and its director Cameron Crowe for casting mainly white actors.
"Caucasians only make up 30% of the population [of Hawaii], but from watching this film, you’d think they made up 99%," wrote MANAA's Guy Aoki.
"This comes in a long line of films - The Descendants, 50 First Dates, Blue Crush, Pearl Harbor - that uses Hawaii for its exotic backdrop but goes out of its way to exclude the very people who live there.
"It’s an insult to the diverse culture and fabric of Hawaii."
Aloha, which is a military-themed love story, also stars Bill Murray, Alec Baldwin and John Krasinski.
Sony Pictures did not comment on the concerns but directed enquiries to a behind-the-scenes feature online to show the movie's Hawaii connection.
It shows Stone's character using the Hawaiian word mana, which can mean power.
There are shots of hula and interviews from a Native Hawaiian sovereignty activist who appears in the movie.
The film is released in the US on 29 May and the UK on 4 September.