Phyllodes tumors and ductal carcinoma in situ (DCIS) are two different types of breast conditions

Phyllodes tumors and ductal carcinoma in situ (DCIS) are two different types of breast conditions, and their treatment approaches can vary based on their characteristics. The decision to perform radiotherapy (RT) after lumpectomy depends on several factors, including the risk of local recurrence and the potential benefit of RT in reducing that risk.

  1. Phyllodes Tumors: Phyllodes tumors are rare fibroepithelial tumors that arise from the connective tissue of the breast. These tumors can be benign, borderline (intermediate), or malignant. The risk of local recurrence after lumpectomy for phyllodes tumors is generally lower compared to invasive cancers. In many cases, the primary treatment for phyllodes tumors is surgical removal with clear margins. The decision to use radiotherapy after phyllodes tumor excision depends on factors such as tumor size, margins, and histological grade. Radiation therapy is usually reserved for cases with higher-grade malignant phyllodes tumors or cases with incomplete excision where there’s a higher risk of recurrence.
  2. Ductal Carcinoma In Situ (DCIS): DCIS is a non-invasive form of breast cancer where abnormal cells are confined within the milk ducts. Even though it has not invaded nearby tissues, DCIS is considered a precursor to invasive breast cancer. After lumpectomy for DCIS, radiation therapy is commonly recommended. This is because DCIS can have a higher risk of local recurrence compared to phyllodes tumors, and radiation helps to lower that risk. The goal is to prevent the progression of DCIS into invasive cancer.

Regarding your second question, the term “calanicular” in the context of the breast seems to be a typographical error or a misunderstanding. It’s possible that you meant “canaliculus” or “lactiferous duct.” The lactiferous ducts are a network of ducts within the breast tissue that carry milk from the lobules, where milk is produced, to the nipple. If you have any specific information or context about where you encountered the term “calanicular” in relation to the breast, I’d be happy to help clarify further.