Danielle Fishel, the actress who played Topanga Lawrence in the popular 90s sitcom “Boy Meets World,” recently shared that she has been diagnosed with ductal carcinoma in situ (DCIS) or Stage 0 of breast cancer. Fishel, 43, revealed the news on her podcast, “Pod Meets World,” which she co-hosts with her former co-stars Rider Strong and Will Friedle. During the episode, she explained that her cancer is classified as "stage zero," which means it was detected early and is typically easier to treat. She plans to undergo surgery to remove the cancerous cells, followed by additional treatment if necessary.What is Stage 0 Cancer?DCIS, or ductal carcinoma in situ, is a non-invasive form of breast cancer. In this condition, the cancer cells are located within the milk ducts of the breast but haven’t spread to nearby tissues. DCIS is considered a pre-invasive or stage zero cancer because it hasn’t yet become invasive, meaning it hasn’t spread beyond the ducts into other parts of the breast or body. The good news is that DCIS is highly treatable, and nearly all women diagnosed with it can be cured.However, if left untreated, DCIS can progress to invasive breast cancer, which can spread to surrounding tissues and potentially other areas of the body. This is why early detection, like in Fishel’s case, is critical. By catching cancer at this early stage, treatment is more effective, and the prognosis is generally favorable.Importance of Regular ScreeningFishel credited her regular breast cancer screenings for the early detection of her condition. She emphasized the importance of not delaying annual mammograms, sharing that her own early diagnosis was the result of promptly scheduling her screening after receiving a reminder.Health experts agree that regular breast cancer screening is vital for early detection and better outcomes. Women of average risk are typically advised to start annual mammograms at age 40. However, those with a higher risk, such as a strong family history of breast or ovarian cancer, certain genetic mutations, or a history of certain benign breast conditions, may need to begin screening earlier.Dr. Richard Reitherman, a radiologist and medical director of breast imaging at MemorialCare Breast Center, told Healthline that breast cancer risk increases with age, especially after 35. Women with a family history of breast cancer should talk to their doctors about starting screening earlier, possibly at an age 10 years younger than when their youngest affected family member was diagnosed.