Depeche Mode has been forced to cancel more European tour dates due to singer Dave Gahan's health ailments. What was initially thought to be a bout with stomach flu was revealed to be "a low-grade malignant tumor in Dave's bladder, which has since been successfully removed."

The 47-year-old singer needs to recover until at least June 8. The veteran group plans on hitting the stage that night in Leipzig, Germany. The 15 dates canceled so far will be rescheduled.

As previously reported, Gahan was rushed to the hospital in Athens, Greece on May 12 minutes before taking the stage, after suffering severe stomach pains.

The group has its whole rest of the year scheduled, with tour dates stretching into 2010.

June 8 Leipzig, Germany - Zentralstadion
June 10 Berlin, Germany - Olympiastadion
June 12 Frankfurt, Germany - Commerzbank Arena
June 13 Munich, Germany - Olympiastadion
June 16 Rome, Italy - Stadio Olimpico
June 18 Milan, Italy - Stadio San Siro
June 20 Werchter, Belgium - TW Classic Festival
June 22 Bratislava, Slovakia - Inter Stadium
June 23 Budapest, Hungary - Puskas Ferenc Stadium
June 25 Prague, Czech Republic - Slavia Stadium
June 27 Paris, France - Stade de France
June 28 Nancy, France - Zenith Amphitheatre
June 30 Copenhagen, Denmark - Parken Stadium
July 1 Hamburg, Germany - HSH Nordbank Arena
July 3 Arvika, Sweden - Arvika Festival
July 6 Carcassone, France - Esplande Gambetta
July 8 Valladolid, Spain - Jose Zorilla Stadium
July 9 Bilbao, Spain - Bilbao BBK Live Festival
July 11 Porto, Portugal - Super Bock Super Rock Festival
July 12 Seville, Spain - Olimpic Stadium
July 24 Toronto, Ontario - Molson Amphitheater
July 25 Montreal, Quebec - Bell Centre
July 28 Washington, D.C. - Nissan Pavilion
July 31 Boston, MA - Comcast (Great Woods)
Aug. 1 Atlantic City, NJ - Borgata
Aug. 3 New York, NY - Madison Square Garden
Aug. 10 Seattle, WA - Key Arena
Aug. 12 San Francisco, CA - Shoreline Amphitheater
Aug. 14 San Diego, CA - Cricket Wireless Amphitheatre
Aug. 16 Los Angeles, CA - Hollywood Bowl
Aug. 17 Los Angeles, CA - Hollywood Bowl
Aug. 19 Anaheim, CA - Honda Center
Aug. 20 Santa Barbara, CA - County Bowl
Aug. 22 Las Vegas, NV - Pearl Concert Theater
Aug. 23 Phoenix, AZ - U.S. Airways Center
Aug. 25 Salt Lake City, UT - E Center
Aug. 27 Denver, CO - Red Rocks
Aug. 29 Dallas, TX - Superpages
Aug. 30 Houston, TX - Woodlands Pavilion
Sept. 1 Atlanta, GA - Lakewood Amphitheater
Sept. 4 Tampa, FL - Ford Amphitheater
Sept. 5 Ft. Lauderdale, FL - BankAtlantic Center
Oct. 1 Guadalajara, Mexico - Arena V.F.G.
Oct. 3 Mexico City, Mexico - Foro Sol
Oct. 8 San Jose, Costa Rica - Autodromo La Guacima
Oct. 10 Bogota, Colombia - Parque Simon Bolivar
Oct. 13 Lima, Peru - Explanada del Estadio Monumental
Oct. 15 Santiago, Chile - TBA
Oct. 17 Buenos Aires, Argentina - TBA
Oct. 22 Rio De Janeiro, Brazil - TBA
Oct. 24 Sao Paulo, Brazil - TBA
Oct. 31 Oberhausen, Germany - Kopi Arena
Nov. 1 Bremen, Germany - AWD Dome
Nov. 3 Hannover, Germany - Tui Arena
Nov. 7 Mannheim, Germany - SAP Arena
Nov. 8 Stuttgart, Germany - Schleyerhalle
Nov. 10 Geneva, Switzerland - Palexpo
Nov. 12 Valencia, Spain - Recinto Ferial
Nov. 20 Barcelona, Spain - Palau St Jordi
Nov. 23 Lyon, France - Tony Garnier
Dec. 1 Nuremberg, Germany - Arena
Dec. 3 Vienna, Austria - Stadhalle
Dec. 4 Graz, Austria - Arena
Dec. 6 Zurich, Switzerland - Hallenstadion
Dec. 7 Zurich, Switzerland - Hallenstadion
Dec. 10 Dublin, Ireland - The O2
Dec. 12 Glasgow, Scotland - SECC
Dec. 13 Birmingham, England - LG Arena (NEC)
Dec. 15 London, England - O2 Arena
Dec. 16 London, England - O2 Arena
Dec. 18 Manchester, England - MEN
Jan. 11 Budapest, Hungary - Sports Arena
Jan. 28 Bergen, Norway - Vestlandhallen
Feb. 4 St. Petersburg, Russia - SKK
Feb. 6 Moscow, Russia - Olympiski