Yes. Even if your trademark is already registered, cancellation is still possible on the grounds of: 

• Violation of proprietary rights
• Breach of copyright
• Mark is proven to not meet the standards in terms of distinctiveness
• Mark is proven to be descriptive, deceptive, misleading, or disparaging
• Mark is proven to violate rights in company name, personal name, registered design, or notorious mark
• Mark is proven to contradict public order and moral principles
• Mark is proven to cause confusion with respect to the product type, origin or condition
• Mark is proven to look almost or exactly like a mark which is internationally registered
• Mark is to be confused with a mark that was registered earlier in another country
• Mark has been inactive or failure to use the mark according to the requirements of Trade Mark Act Article 25