Macmillan13 May 2026 20:39
Nice update with a Modi patient recently.
The size of the remaining tumour mass has been the same for quite a while now. Fingers crossed for them.
What Comprises the Remaining Core?
A residual tumor core after successful treatment is usually composed of non-cancerous materials rather than a live malignancy:
Necrotic Tissue: This consists of dead cancer cells killed by chemotherapy, radiation, or immunotherapy that the body has not yet broken down and cleared away.
Scar Tissue and Fibrosis: Aggressive treatment causes local inflammation, leading the body to replace the treated tumor area with dense, fibrous scar tissue.
Benign Structures: In certain cancers (such as testicular teratomas), the active malignant components may die off, leaving behind non-cancerous, mature tissue structures that remain structurally intact.
How Doctors Verify the Cancer is Gone
Standard imaging like CT or MRI scans only show the shape and size of a mass, not whether the cells inside it are alive. To confirm the cancer is truly inactive despite the remaining core, oncologists use specialized diagnostic tools:
PET Scans (Positron Emission Tomography): Active cancer cells consume high amounts of glucose. A PET scan tracks sugar consumption; if the remaining tumor core does not "light up" (is non-avid), it indicates the mass is metabolically dead scar tissue.
Tumor Markers: Blood tests monitor specific proteins produced by active tumors. If these levels drop to normal and stay there, it confirms the residual mass is inactive.
Liquid Biopsies: Advanced blood tests check for circulating tumor DNA (ctDNA) to ensure no active cellular shedding is occurring.
Next Clinical Steps for a Residual Mass
The management strategy for a dead tumor core depends heavily on its size, location, and original cancer type:
Active Surveillance ("Watchful Waiting"): If the core is in a safe location, small, or continually shrinking, doctors will leave it alone. Over months or years, the body’s immune system may naturally reabsorb and shrink the mass further.
Surgical Resection: If the residual core is quite large (often greater than 3 cm), puts physical pressure on nearby organs, or carries a high risk of containing hidden, dormant cancer cells, a surgeon may remove it.
Adjuvant / Maintenance Therapy: In some solid tumors, low-dose treatments are continued to ensure any microscopic cells hiding near the core remain completely suppressed.
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