Most lumps and bumps are harmless. But a small number of soft-tissue lumps turn out to be a sarcoma — a rare cancer that grows in the body’s soft tissues such as muscle and fat. Because sarcomas can look and feel like an ordinary lipoma or cyst, they are sometimes removed as if they were harmless, before anyone suspects cancer. Surgeons call this an unplanned excision. This paper asks a fair question: does it actually matter?
What the study looked at
The researchers pooled 43 previously published studies covering 16,946 people treated for a soft-tissue sarcoma. Of those, 6,017 (about 36%) had an unplanned excision — the lump was taken out without a sarcoma diagnosis first, and therefore without the wide margin of healthy tissue a cancer operation would normally take.
They compared those patients with people whose sarcoma was diagnosed first — by scan and biopsy — and then removed in a planned cancer operation. The outcomes measured were whether the tumour came back in the same place (local recurrence), survival at five years, whether an amputation was needed, and whether reconstructive surgery was required.
What they found
- Unplanned excision was linked to a higher chance of the tumour returning locally within five years (risk ratio 1.35, 95% CI 1.05–1.73).
- When surgeons re-operated to clear the area afterwards, 59% of those specimens still contained tumour (850 of 1,429) — even though the lump itself had already been removed.
- Where residual tumour was found, local recurrence was substantially more likely (risk ratio 2.59, 95% CI 1.91–3.50).
- Reassuringly, five-year survival was not significantly different between the two groups (risk ratio 0.90, 95% CI 0.78–1.04), and rates of amputation and reconstructive surgery were not significantly different either.
- Separately, when a sarcoma did recur locally, survival was poorer (risk ratio 1.82, 95% CI 1.35–2.46).
What it means for you
This is the evidence behind a principle sarcoma services follow everywhere: where a soft-tissue lump is suspicious, it is scanned and biopsied before it is removed, not after. Getting the diagnosis first allows the operation to be planned properly the first time.
It is worth keeping this in proportion. The overwhelming majority of soft-tissue lumps are benign and need no cancer work-up at all. The features that usually prompt a scan are a lump that is larger than about 5 cm, deep to the muscle layer, growing, or painful — and if you have one of those, it is reasonable to ask your GP about imaging before anything is removed.
If you have already had a lump removed and it turned out to be a sarcoma, this paper is not a reason to lose heart. Survival in the pooled data was not worse. It is, however, the reason your surgeon is likely to recommend a further operation to clear the tumour bed — because more often than not, there is still tumour there to find.
A caveat worth knowing
Every study in this review was observational, and none of the pooled figures were adjusted for how large, deep or aggressive the tumours were. In fact, the planned-excision tumours tended to be larger and deeper — which, if anything, works against the unplanned-excision group looking worse, but it does mean the two groups were not truly like for like. The studies also varied a good deal in their results, and the local-recurrence finding was statistically fragile: it rested on a small number of patients and would not have reached significance had a few outcomes fallen differently.
A randomised trial could settle this properly, but no one could ethically run one — you cannot deliberately assign a person to have their cancer removed without diagnosing it first. Pooled real-world data like this is the best evidence available, and it points consistently in the same direction.