Question: What is (are) Urachal cancer ?
Answer: Urachal cancer is a rare type of bladder cancer, making up less than 1% of all bladder cancers. Only about 350 cases have been described in the medical literature to date. The urachus is a primitive structure which before birth connected the bellybutton and the bladder. This connection normally disappears before birth, but in some people remains. Urachal cancers are classified as such based on location at the dome or anterior wall of the bladder and discovery of remnants of the urachus. Most urachal cancers are adenocarcinomas (cancers that develop from gland cells). Others may be sarcomas (which develop from connective tissue - such as leiomyosarcoma, rhabdomyosarcoma, and malignant fibrous histiocytoma), small cell carcinomas, transitional cell cancer, and mixed neoplasias. Most individuals with urachal cancer present with hematuria (blood in urine). Other symptoms may include abdominal pain, a palpable abdominal mass, mucinuria, and bacteriuria. Patients who present with early disease confined to the urachus have a good prognosis when treated with partial cystectomy, umbilicotomy, and urachal resection. The prognosis for those with advanced disease is less promising.
Source: GARD

Question: What are the treatments for Urachal cancer ?
Answer: How might urachal cancer be treated? Surgical resection in the form of partial (segmental) or radical cystoprostatectomy is the main form of treatment. However, similar results are seen with a conservative surgery that involves partial cystectomy with umbilicotomy and removal of the urachus. The role of chemotherapy and radiation therapy for the treatment of urachal cancer is unclear, although some studies show that chemotherapy can induce objective response in some cases. Chemotherapy regimens that may be used include: single-agent 5-fluorouracil (5-FU), 5-FU and cisplatin, 5-FU, lomustine and vincristine, taxol and cisplatin, platinum and etoposide, and MVAC (methotrexate, vinblastine, doxorubicin, cisplatin) alone or in conjunction with radiation therapy.
Source: GARD