People who have had basal cell or squamous cell skin cancer also have an increased risk of developing melanoma.
Squamous cell cancer cannot turn into melanoma since each type of cancer arises from different types of cells in the skin.
Untreated squamous cell carcinoma of the skin can destroy nearby healthy tissue, spread to the lymph nodes or other organs, and may be fatal, although this is uncommon. The risk of aggressive squamous cell carcinoma of the skin may be increased in cases where the cancer: Is particularly large or deep.
Metastasis of cutaneous squamous cell carcinoma (cSCC) is rare. However, certain tumor and patient characteristics increase the risk of metastasis. Prior studies have demonstrated metastasis rates of 3-9%, occurring, on average, one to two years after initial diagnosis [6].
Metastatic squamous cell carcinoma is often referred to as a neck cancer because it tends to travel to the lymph nodes in the neck and around the collarbone. Because of this, signs of metastasis may include a painful or tender lump in the neck or a sore throat that doesn't improve or go away.
Most (95% to 98%) of squamous cell carcinomas can be cured if they are treated early. Once squamous cell carcinoma has spread beyond the skin, though, less than half of people live five years, even with aggressive treatment.
In general, the squamous cell carcinoma survival rate is very high—when detected early, the five-year survival rate is 99 percent. Even if squamous cell carcinoma has spread to nearby lymph nodes, the cancer may be effectively treated through a combination of surgery and radiation treatment.
They are of concern because of the similarity to squamous cell cancer. Squamous cell carcinoma is one of the three most common types of skin cancer. Basal cell, squamous cell, and melanoma. Squamous cell cancers can metastasize (spread) and should be removed surgically as soon as they are diagnosed.
Pulmonary metastases are the most frequent in SCC, accounting for 66% of distant metastases. It may be difficult to distinguish pulmonary metastasis from a new primary tumor, particularly if solitary. Other metastatic sites include bone (22%), liver (10%), skin, mediastinum and bone marrow.
Stage 4 squamous cell carcinoma
In stage 4, the cancer can be any size and has spread (metastasized) to one or more lymph nodes which are larger than 3 cm and may have spread to bones or other organs in the body.
Systemic chemotherapy is not widely used for treating squamous cell carcinoma. In most cases, the cancer cells are confined to one area of skin and, if detected early, can be effectively addressed with localized treatments, such as surgery.
Treatment should happen as soon as possible after diagnosis, since more advanced SCCs of the skin are more difficult to treat and can become dangerous, spreading to local lymph nodes, distant tissues and organs.
Most squamous cell carcinomas of the skin can be completely removed with relatively minor surgery or occasionally with a medicine applied to the skin. Which treatments are best for you depends on the size, location and aggressiveness of the tumor, as well as your own preferences.
Although squamous cell carcinoma can be more aggressive than basal cell cancer, the risk of this type of cancer spreading is low—as long as the cancer is treated early, Dr. Leffell says. He notes that the lesions must be treated with respect because they may grow rapidly and invade deeply.
The key warning signs are a new growth, a spot or bump that's getting larger over time, or a sore that doesn't heal within a few weeks. (See Signs and Symptoms of Basal and Squamous Cell Skin Cancer for a more detailed description of what to look for.)
Symptoms of stage 4 squamous cell carcinoma usually begin with some kind of skin lesion or growth. Often, the tumors of squamous cell carcinoma look like a scaly red patch of skin that won't heal. These tumors are often crusty and raised, and they may cause sores or ulcers that last for several weeks.
Squamous cell carcinoma is cancer that occurs in the outermost part of the epidermis (skin surface) or the surface of certain portions of the body (areas of the head and neck or genitalia) known as squamous cells.
Squamous cell carcinoma rarely metastasizes (spreads to other areas of the body), and when spreading does occur, it typically happens slowly. Indeed, most squamous cell carcinoma cases are diagnosed before the cancer has progressed beyond the upper layer of skin.
Treatment overview
In June 2020, pembrolizumab (Keytruda®) was approved by the FDA for the treatment of recurrent or metastatic SCC that is not curable by radiation or surgery. In July 2021, the FDA expanded this approval to include SCC that is locally advanced and not curable by radiation or surgery.
Skin cancer history
If you've had SCC, you have a high chance of recurrence. You also have an elevated risk of developing another SCC or basal cell carcinoma (BCC), since sun damage is the primary cause of both forms of skin cancer.
About 60 percent of people who have had one skin cancer will be diagnosed with a second one within 10 years, says a 2015 study in JAMA Dermatology. Your odds increase dramatically if you've been diagnosed with a second BCC or SCC (or third, or any other number beyond first).
It is estimated that about 2,000 people die from basal cell and squamous cell skin cancer each year. Older adults and people with a suppressed immune system have a higher risk of dying from these types of skin cancer. It is estimated that 7,990 people will die from melanoma in the United States in 2023.