G.R. No. L-60346 October 11, 1985
JOSE P. MERCADO JR., petitioner, vs. EMPLOYEES’ COMPENSATION COMMISSION and GOVERNMENT SERVICE INSURANCE SYSTEM (Refuse & Environmental Sanitation Center, City of Manila), respondents.

FACTS

Petitioner Jose P. Mercado Jr., a government employee for 34 years, was forced to retire due to an intracranial new growth or brain tumor. His claim for compensation benefits was denied by the Government Service Insurance System (GSIS) and the Employees’ Compensation Commission (ECC) on the ground that he failed to prove a reasonable work-connection between his ailment and his employment. The GSIS, in a motion for reconsideration, argued that requiring such a connection is mandated by law. It contended that declaring ailments with unknown causes as compensable would place such claimants in a better position than those with known but non-work-connected causes, rendering the legal standard meaningless and leading to an absurd result where all ailments become compensable.
It was undisputed that the exact etiology of a brain tumor is medically unknown. It was also established that Mercado entered government service in good health and was exposed to unhygienic working conditions, especially during his early employment in post-war Manila, which was characterized by ruins, dust, unsanitary conditions, and a lack of proper garbage collection and water systems. The GSIS cited three other resolutions where claims were denied for lack of proof of work-connection, arguing for consistency.

ISSUE

Whether the petitioner’s brain tumor, an ailment with an unknown medical cause, is compensable under the Employees’ Compensation Act despite the absence of direct proof of work-connection.

RULING

The Supreme Court denied the motion for reconsideration and granted the compensation claim. The legal logic rests on the principle of probability and the constitutional mandate of social justice and protection to labor. While direct causal proof is impossible for diseases of unknown etiology, the Court held that substantial evidence of a probable work-connection suffices. Here, the probability was established by the confluence of three key facts: Mercado entered government service in good health, served for 34 years, and was exposed to unhygienic working conditions recognized as predisposing factors for diseases like cancer.
The Court found this case analogous to Cristobal vs. ECC, which involved rectal cancer. In both, the impossibility of direct proof due to medical uncertainty does not negate the probability of work-connection given the employment conditions. The constitutional policy of affording maximum aid to labor necessitates a liberal interpretation in favor of the employee. The respondent’s fear of making all unknown-cause ailments compensable is a non sequitur; each claim must still be evaluated based on the factual circumstances linking the employment environment to the disease’s risk. The award of attorney’s fees was also upheld as proper compensation for legal services necessitated by the unjust denial of the claim.